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Asym./Biol. Unit (Jmol Viewer)

Asym./Biol. Unit - sites (Jmol Viewer)

Title :   STRUCTURAL BASIS FOR A MUNC13-1 DIMERIC - MUNC13-1 - RIM HETERODIMER SWITCH: C2-DOMAINS AS VERSATILE PROTEIN-PROTEIN INTERACTION MODULES

Authors :   J. Lu, M. Machius, I. Dulubova, H. Dai, T. C. Sudhof, D. R. Tomchick, J. Ri

Date :   06 Apr 06 (Deposition) - 07 Jun 06 (Release) - 30 Jan 13 (Revision)

Method :   X-RAY DIFFRACTION

Resolution :   1.78

Chains :   Asym./Biol. Unit : A,B,C

Keywords :   Neurotransmitter Transport, Exocytosis, Zinc Finger, Synaptosome, Phorbol-Ester Binding, Neurotransmitter Release, Metal-Binding, Protein- Protein Interactions, Rim, Munc13, Synapse, Transport, C2 Domains (Keyword Search: [Gene Ontology, PubMed, Web (Google)] )

Reference :   J. Lu, M. Machius, I. Dulubova, H. Dai, T. C. Sudhof, D. R. Tomchick, J. Rizo
Structural Basis For A Munc13-1 Homodimer To Munc13-1/Rim Heterodimer Switch.
Plos Biol. V. 4 E192 2006
PubMed-ID: 16732694 | Reference-DOI: 10.1371/JOURNAL.PBIO.0040192
(for further references see the PDB file header)

Molecule 1 - UNC-13 HOMOLOG A
	Chains	:	A, B
	Engineered	:	YES
	Expression System	:	ESCHERICHIA COLI
	Expression System Plasmid	:	PGEX-KG
	Expression System Strain	:	BL21
	Expression System Taxid	:	511693
	Fragment	:	C2A DOMAIN, RESIDUES 2-150
	Mutation	:	YES
	Organism Common	:	RAT
	Organism Scientific	:	RATTUS NORVEGICUS
	Organism Taxid	:	10116
	Other Details	:	THE RECOMBINANT PROTEIN CONTAINS RESIDUES 2-150 OF MUNC13-1 AND VECTOR-DERIVED SEQUENCES, GSPGISGGGGGIL- AT THE N-TERMINUS AND -KLNSS AT THE C- TERMINUS
	Synonym	:	MUNC13-1

Molecule 2 - REGULATING SYNAPTIC MEMBRANE EXOCYTOSIS PROTEIN 2
	Chains	:	C
	Engineered	:	YES
	Expression System	:	ESCHERICHIA COLI
	Expression System Plasmid	:	PGEX-KT
	Expression System Strain	:	BL21
	Expression System Taxid	:	511693
	Fragment	:	ZINC-FINGER DOMAIN, RESIDUES 83-142
	Organism Common	:	RAT
	Organism Scientific	:	RATTUS NORVEGICUS
	Organism Taxid	:	10116
	Other Details	:	THE RECOMBINANT PROTEIN CONTAINS RESIDUES 83-142 AND TWO VECTOR-DERIVED AMINO ACID RESIDUES, GS-, AT THE N TERMINUS
	Synonym	:	RIM2ALPHA, RAB3-INTERACTING MOLECULE 2, RIM 2

		1	2	3
Asymmetric/Biological Unit	:	A	B	C

Summary Information (see also Sequences/Alignments below)

Asymmetric/Biological Unit (3, 13)

No.	Name	Count	Type	Full Name
1	EDO	5	Ligand/Ion	1,2-ETHANEDIOL
2	GOL	6	Ligand/Ion	GLYCEROL
3	ZN	2	Ligand/Ion	ZINC ION

Asymmetric Unit (13, 13)

No.	Name	Evidence	Residues	Description
01	AC1	SOFTWARE	CYS C:92 , CYS C:95 , CYS C:116 , CYS C:119	BINDING SITE FOR RESIDUE ZN C 201
02	AC2	SOFTWARE	CYS C:108 , CYS C:111 , CYS C:134 , CYS C:137	BINDING SITE FOR RESIDUE ZN C 202
03	AC3	SOFTWARE	SER A:2 , GLU A:52 , ILE A:53 , HOH A:2016 , GOL B:1157 , HOH B:2088 , GLY C:105 , HIS C:106	BINDING SITE FOR RESIDUE EDO A1155
04	AC4	SOFTWARE	GLY A:7 , LYS A:9 , GLU A:46 , GLN A:47 , ASP A:48	BINDING SITE FOR RESIDUE EDO A1156
05	AC5	SOFTWARE	VAL B:6 , GLY B:7 , ASP B:48 , GLU B:91 , ASP B:124 , HIS B:126 , HOH B:2086	BINDING SITE FOR RESIDUE EDO B1156
06	AC6	SOFTWARE	LEU A:148 , ILE B:70 , SER C:109 , TYR C:110 , GLN C:112 , HOH C:2061	BINDING SITE FOR RESIDUE EDO C1143
07	AC7	SOFTWARE	PHE C:100 , ASP C:102 , GLY C:103 , CYS C:104 , LYS C:114 , HOH C:2062	BINDING SITE FOR RESIDUE EDO C1144
08	AC8	SOFTWARE	GLU A:95 , LEU A:123 , ASP A:124 , ALA A:125 , HOH A:2175 , HOH A:2176 , HOH A:2177 , HOH A:2178	BINDING SITE FOR RESIDUE GOL A1157
09	AC9	SOFTWARE	TYR A:23 , THR A:34 , THR A:35 , ILE A:36 , LYS A:67 , ASN B:153 , SER B:154	BINDING SITE FOR RESIDUE GOL A1158
10	BC1	SOFTWARE	GLU A:136 , GLU A:137 , TYR A:140 , HOH A:2156 , HOH A:2179 , HOH A:2180 , HOH A:2181 , GLN C:141 , HOH C:2058	BINDING SITE FOR RESIDUE GOL A1159
11	BC2	SOFTWARE	EDO A:1155 , TYR B:23 , THR B:35 , HOH B:2052 , HOH B:2087 , HOH B:2088 , HOH B:2089 , HOH B:2090 , HIS C:106 , TRP C:132 , GOL C:1145	BINDING SITE FOR RESIDUE GOL B1157
12	BC3	SOFTWARE	GLU B:95 , LEU B:123 , ALA B:125 , HOH B:2092 , HOH B:2093 , HOH B:2094	BINDING SITE FOR RESIDUE GOL B1158
13	BC4	SOFTWARE	TYR B:23 , TRP B:65 , GOL B:1157 , HOH B:2089 , ARG C:122 , VAL C:130 , TRP C:132 , HOH C:2064	BINDING SITE FOR RESIDUE GOL C1145

(no "SS Bond" information available for 2CJS)

(no "Cis Peptide Bond" information available for 2CJS)

(no "SAP(SNP)/Variant" information available for 2CJS)

(no "PROSITE Motif" information available for 2CJS)

Asymmetric/Biological Unit (2, 2)

	ENSEMBL					UniProtKB			PDB
No.	Transcript ID	Exon	Exon ID	Genome Location	Length	ID	Location	Length	Count	Location	Length
1.1	ENSRNOT00000050753	1	ENSRNOE00000454594	chr7:74757003-74757229	227	RIMS2_RAT	1-59	59	0	-	-
1.4	ENSRNOT00000050753	4	ENSRNOE00000223871	chr7:74862495-74862705	211	RIMS2_RAT	59-129	71	1	C:89-129	41
1.5	ENSRNOT00000050753	5	ENSRNOE00000223852	chr7:74922056-74922366	311	RIMS2_RAT	130-233	104	1	C:130-142	13
1.7	ENSRNOT00000050753	7	ENSRNOE00000245525	chr7:75007836-75008761	926	RIMS2_RAT	233-542	310	0	-	-
1.8	ENSRNOT00000050753	8	ENSRNOE00000236412	chr7:75022293-75022360	68	RIMS2_RAT	542-564	23	0	-	-
1.10	ENSRNOT00000050753	10	ENSRNOE00000309334	chr7:75024249-75024368	120	RIMS2_RAT	565-604	40	0	-	-
1.11	ENSRNOT00000050753	11	ENSRNOE00000313303	chr7:75026216-75026315	100	RIMS2_RAT	605-638	34	0	-	-
1.12	ENSRNOT00000050753	12	ENSRNOE00000342737	chr7:75027291-75027414	124	RIMS2_RAT	638-679	42	0	-	-
1.13	ENSRNOT00000050753	13	ENSRNOE00000310460	chr7:75029686-75029732	47	RIMS2_RAT	679-695	17	0	-	-
1.14	ENSRNOT00000050753	14	ENSRNOE00000300188	chr7:75032477-75032589	113	RIMS2_RAT	695-732	38	0	-	-
1.15	ENSRNOT00000050753	15	ENSRNOE00000328054	chr7:75038397-75038444	48	RIMS2_RAT	733-748	16	0	-	-
1.16	ENSRNOT00000050753	16	ENSRNOE00000236330	chr7:75041602-75041732	131	RIMS2_RAT	749-792	44	0	-	-
1.17	ENSRNOT00000050753	17	ENSRNOE00000236358	chr7:75048205-75048376	172	RIMS2_RAT	792-849	58	0	-	-
1.18	ENSRNOT00000050753	18	ENSRNOE00000236351	chr7:75050571-75050724	154	RIMS2_RAT	850-901	52	0	-	-
1.19	ENSRNOT00000050753	19	ENSRNOE00000236324	chr7:75081091-75081159	69	RIMS2_RAT	901-924	24	0	-	-
1.20	ENSRNOT00000050753	20	ENSRNOE00000236341	chr7:75090877-75091033	157	RIMS2_RAT	924-976	53	0	-	-
1.21	ENSRNOT00000050753	21	ENSRNOE00000045881	chr7:75092194-75092304	111	RIMS2_RAT	976-1013	38	0	-	-
1.22	ENSRNOT00000050753	22	ENSRNOE00000329316	chr7:75098602-75098667	66	RIMS2_RAT	1013-1035	23	0	-	-
1.23	ENSRNOT00000050753	23	ENSRNOE00000046081	chr7:75109786-75109965	180	RIMS2_RAT	1035-1095	61	0	-	-
1.24	ENSRNOT00000050753	24	ENSRNOE00000350038	chr7:75110820-75110929	110	RIMS2_RAT	1095-1132	38	0	-	-
1.25	ENSRNOT00000050753	25	ENSRNOE00000359488	chr7:75130866-75130907	42	RIMS2_RAT	1132-1146	15	0	-	-
1.26	ENSRNOT00000050753	26	ENSRNOE00000223420	chr7:75139420-75139520	101	RIMS2_RAT	1146-1179	34	0	-	-
1.28	ENSRNOT00000050753	28	ENSRNOE00000248632	chr7:75159578-75159750	173	RIMS2_RAT	1180-1237	58	0	-	-
1.30	ENSRNOT00000050753	30	ENSRNOE00000248608	chr7:75196983-75197224	242	RIMS2_RAT	1237-1318	82	0	-	-
1.32a	ENSRNOT00000050753	32a	ENSRNOE00000248577	chr7:75250727-75250868	142	RIMS2_RAT	1318-1365	48	0	-	-
1.33	ENSRNOT00000050753	33	ENSRNOE00000321148	chr7:75268338-75268450	113	RIMS2_RAT	1365-1403	39	0	-	-
1.34	ENSRNOT00000050753	34	ENSRNOE00000248520	chr7:75268763-75268864	102	RIMS2_RAT	1403-1437	35	0	-	-
1.35	ENSRNOT00000050753	35	ENSRNOE00000248504	chr7:75270057-75270196	140	RIMS2_RAT	1437-1483	47	0	-	-
1.36	ENSRNOT00000050753	36	ENSRNOE00000045670	chr7:75270633-75271771	1139	RIMS2_RAT	1484-1555	72	0	-	-

Asymmetric/Biological Unit

Reformat:	Number of residues per line = ('0' or empty: single-line sequence representation)
	Number of residues per labelling interval =
	UniProt sequence: complete aligned part

Show mapping:	SCOP domains	CATH domains	Pfam domains	Secondary structure (by author)
	SAPs(SNPs)	PROSITE motifs	Exons
	(details for a mapped element are shown in a popup box when the mouse pointer rests over it)

Chain A from PDB  Type:PROTEIN  Length:163
 aligned with UN13A_RAT | Q62768 from UniProtKB/Swiss-Prot  Length:1735

    Alignment length:163
                                     1                                                                                                                                                         
                                     1        11        21        31        41        51        61        71        81        91       101       111       121       131       141       151   
            UN13A_RAT     - ---------MSLLCVGVKKAKFDGAQEKFNTYVTLKVQNVKSTTIAVRGSQPSWEQDFMFEINRLDLGLTVEVWNKGLIWDTMVGTVWIPLRTIRQSNEEGPGEWLTLDSQAIMADSEICGTKDPTFHRILLDAHFELPLDIPEEEARYWAKKLEQLNAMRDQ 154
               SCOP domains ----------d2cjsa1 A:2-150 Unc-13 homolog A                                                                                                                     ---- SCOP domains
               CATH domains ------------------------------------------------------------------------------------------------------------------------------------------------------------------- CATH domains
               Pfam domains ------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author .ee........eeeeeeeeee...hhhh.eeeeeeee..eeee...ee....eeeeeeeee......eeeeeeee......eeeeeeeee.hhh.........eeeeeeeeeeee..eeeeeeeeeeeeeeeeeeee.....hhhhhhhhhhhhhhhhhhhhh Sec.struct. author
                 SAPs(SNPs) ------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE ------------------------------------------------------------------------------------------------------------------------------------------------------------------- PROSITE
                 Transcript ------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 2cjs A  -8 GISGGGGGILSLLCVGVKKAKFDGAQEKFNTYVTLKVQNVESTTIAVRGSQPSWEQDFMFEINRLDLGLTVEVWNKGLIWDTMVGTVWIPLRTIRQSNEEGPGEWLTLDSQAIMADSEICGTKDPTFHRILLDAHFELPLDIPEEEARYWAKKLEQLNAKLNS 154
                                     1        11        21        31        41        51        61        71        81        91       101       111       121       131       141       151

Chain B from PDB  Type:PROTEIN  Length:156
 aligned with UN13A_RAT | Q62768 from UniProtKB/Swiss-Prot  Length:1735

    Alignment length:173
                             1                                                                                                                                                                           
                             |       9        19        29        39        49        59        69        79        89        99       109       119       129       139       149       159       169   
            UN13A_RAT     - -MSLLCVGVKKAKFDGAQEKFNTYVTLKVQNVKSTTIAVRGSQPSWEQDFMFEINRLDLGLTVEVWNKGLIWDTMVGTVWIPLRTIRQSNEEGPGEWLTLDSQAIMADSEICGTKDPTFHRILLDAHFELPLDIPEEEARYWAKKLEQLNAMRDQDEYSFQDQQDKPLPVPSS 172
               SCOP domains d2cjsb_ B: automated matches                                                                                                                                                  SCOP domains
               CATH domains ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- CATH domains
               Pfam domains ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author ..eeeeeeeeeee...hhhh.eeeeeeee..eeee...ee....eeeeeeeeee.....eeeeeeee.....eeeeeeeeee.hhhee.......eeeeeeeeeee....eeeeeeeeeeeeeeeeeee.....hhhhhhhhhhhhh.......-----------------.. Sec.struct. author
                 SAPs(SNPs) ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- PROSITE
                 Transcript ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 2cjs B   0 ILSLLCVGVKKAKFDGAQEKFNTYVTLKVQNVESTTIAVRGSQPSWEQDFMFEINRLDLGLTVEVWNKGLIWDTMVGTVWIPLRTIRQSNEEGPGEWLTLDSQAIMADSEICGTKDPTFHRILLDAHFELPLDIPEEEARYWAKKLEQLNAKLN-----------------SS 155
                                     9        19        29        39        49        59        69        79        89        99       109       119       129       139       149   |     -         - | 
                                                                                                                                                                                   153               154

Chain C from PDB  Type:PROTEIN  Length:54
 aligned with RIMS2_RAT | Q9JIS1 from UniProtKB/Swiss-Prot  Length:1555

    Alignment length:54
                                    98       108       118       128       138    
            RIMS2_RAT    89 APTCGICHKTKFADGCGHNCSYCQTKFCARCGGRVSLRSNKVMWVCNLCRKQQE 142
               SCOP domains ------------------------------------------------------ SCOP domains
               CATH domains ------------------------------------------------------ CATH domains
               Pfam domains ------------------------------------------------------ Pfam domains
         Sec.struct. author ..........ee.....ee......ee....eeeeee...eeeeeehhhhhhhh Sec.struct. author
                 SAPs(SNPs) ------------------------------------------------------ SAPs(SNPs)
                    PROSITE ------------------------------------------------------ PROSITE
               Transcript 1 Exon 1.4  PDB: C:89-129 UniProt: 59-129  Exon 1.5      Transcript 1
                 2cjs C  89 APTCGICHKTKFADGCGHNCSYCQTKFCARCGGRVSLRSNKVMWVCNLCRKQQE 142
                                    98       108       118       128       138

Legend:		→ Mismatch	(orange background)
	-	→ Gap	(green background, '-', border residues have a numbering label)
		→ Modified Residue	(blue background, lower-case, 'x' indicates undefined single-letter code, labelled with number + name)
	x	→ Chemical Group	(purple background, 'x', labelled with number + name, e.g. ACE or NH2)
	extra numbering lines below/above indicate numbering irregularities and modified residue names etc., number ends below/above '\|'

Asymmetric/Biological Unit

Classes(

)

Folds(

)

Superfamilies( (-)

)

Families(

)

Protein Domains( (-)

)

Organisms( (-)

)

Class: All beta proteins (24004)

Fold: C2 domain-like (198)

Superfamily: C2 domain (Calcium/lipid-binding domain, CaLB) (148)

Family: PLC-like (P variant) (81)

Protein domain: automated matches (3)

Norway rat (Rattus norvegicus) [TaxId: 10116] (2)

d2cjsb_

Protein domain: Unc-13 homolog A (2)

Norway rat (Rattus norvegicus) [TaxId: 10116] (2)

d2cjsa1

A:2-150

(no "CATH Domain" information available for 2CJS)

(no "Pfam Domain" information available for 2CJS)

Asymmetric/Biological Unit(hide GO term definitions)

Chain A,B (UN13A_RAT | Q62768)

molecular function
	GO:0000149	SNARE binding	Interacting selectively and non-covalently with a SNARE (soluble N-ethylmaleimide-sensitive factor attached protein receptor) protein.
	GO:0019992	diacylglycerol binding	Interacting selectively and non-covalently with diacylglycerol, a diester of glycerol and two fatty acids.
	GO:0046872	metal ion binding	Interacting selectively and non-covalently with any metal ion.
	GO:0047485	protein N-terminus binding	Interacting selectively and non-covalently with a protein N-terminus, the end of any peptide chain at which the 2-amino (or 2-imino) function of a constituent amino acid is not attached in peptide linkage to another amino-acid residue.
	GO:0019904	protein domain specific binding	Interacting selectively and non-covalently with a specific domain of a protein.
	GO:0046982	protein heterodimerization activity	Interacting selectively and non-covalently with a nonidentical protein to form a heterodimer.
	GO:0042803	protein homodimerization activity	Interacting selectively and non-covalently with an identical protein to form a homodimer.
	GO:0030507	spectrin binding	Interacting selectively and non-covalently with spectrin, a protein that is the major constituent of the erythrocyte cytoskeletal network. It associates with band 4.1 (see band protein) and actin to form the cytoskeletal superstructure of the erythrocyte plasma membrane. It is composed of nonhomologous chains, alpha and beta, which aggregate side-to-side in an antiparallel fashion to form dimers, tetramers, and higher polymers.
	GO:0017075	syntaxin-1 binding	Interacting selectively and non-covalently with the SNAP receptor syntaxin-1.
biological process
	GO:0030154	cell differentiation	The process in which relatively unspecialized cells, e.g. embryonic or regenerative cells, acquire specialized structural and/or functional features that characterize the cells, tissues, or organs of the mature organism or some other relatively stable phase of the organism's life history. Differentiation includes the processes involved in commitment of a cell to a specific fate and its subsequent development to the mature state.
	GO:0007268	chemical synaptic transmission	The vesicular release of classical neurotransmitter molecules from a presynapse, across a chemical synapse, the subsequent activation of neurotransmitter receptors at the postsynapse of a target cell (neuron, muscle, or secretory cell) and the effects of this activation on the postsynaptic membrane potential and ionic composition of the postsynaptic cytosol. This process encompasses both spontaneous and evoked release of neurotransmitter and all parts of synaptic vesicle exocytosis. Evoked transmission starts with the arrival of an action potential at the presynapse.
	GO:0006887	exocytosis	A process of secretion by a cell that results in the release of intracellular molecules (e.g. hormones, matrix proteins) contained within a membrane-bounded vesicle. Exocytosis can occur either by full fusion, when the vesicle collapses into the plasma membrane, or by a kiss-and-run mechanism that involves the formation of a transient contact, a pore, between a granule (for exemple of chromaffin cells) and the plasma membrane. The latter process most of the time leads to only partial secretion of the granule content. Exocytosis begins with steps that prepare vesicles for fusion with the membrane (tethering and docking) and ends when molecules are secreted from the cell.
	GO:0035556	intracellular signal transduction	The process in which a signal is passed on to downstream components within the cell, which become activated themselves to further propagate the signal and finally trigger a change in the function or state of the cell.
	GO:0060291	long-term synaptic potentiation	A process that modulates synaptic plasticity such that synapses are changed resulting in the increase in the rate, or frequency of synaptic transmission at the synapse.
	GO:0007269	neurotransmitter secretion	The regulated release of neurotransmitter from the presynapse into the synaptic cleft via calcium regualated exocytosis during synaptic transmission.
	GO:0016082	synaptic vesicle priming	A process that converts synaptic vesicles to a state of competence for calcium triggered fusion with the active zone membrane by bringing the two membranes into very close proximity. Priming typically (but not always) occurs after docking (Jahn and Fasshauer, 2012). Primed vesicles are also capable of spontaneously fusing with the active zone membrane.
cellular component
	GO:0030054	cell junction	A cellular component that forms a specialized region of connection between two or more cells or between a cell and the extracellular matrix. At a cell junction, anchoring proteins extend through the plasma membrane to link cytoskeletal proteins in one cell to cytoskeletal proteins in neighboring cells or to proteins in the extracellular matrix.
	GO:0005737	cytoplasm	All of the contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.
	GO:0060076	excitatory synapse	A synapse in which an action potential in the presynaptic cell increases the probability of an action potential occurring in the postsynaptic cell.
	GO:0016020	membrane	A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it.
	GO:0043005	neuron projection	A prolongation or process extending from a nerve cell, e.g. an axon or dendrite.
	GO:0005886	plasma membrane	The membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins.
	GO:0042734	presynaptic membrane	A specialized area of membrane of the axon terminal that faces the plasma membrane of the neuron or muscle fiber with which the axon terminal establishes a synaptic junction; many synaptic junctions exhibit structural presynaptic characteristics, such as conical, electron-dense internal protrusions, that distinguish it from the remainder of the axon plasma membrane.
	GO:0043234	protein complex	A stable macromolecular complex composed (only) of two or more polypeptide subunits along with any covalently attached molecules (such as lipid anchors or oligosaccharide) or non-protein prosthetic groups (such as nucleotides or metal ions). Prosthetic group in this context refers to a tightly bound cofactor. The component polypeptide subunits may be identical.
	GO:0045202	synapse	The junction between a nerve fiber of one neuron and another neuron, muscle fiber or glial cell. As the nerve fiber approaches the synapse it enlarges into a specialized structure, the presynaptic nerve ending, which contains mitochondria and synaptic vesicles. At the tip of the nerve ending is the presynaptic membrane; facing it, and separated from it by a minute cleft (the synaptic cleft) is a specialized area of membrane on the receiving cell, known as the postsynaptic membrane. In response to the arrival of nerve impulses, the presynaptic nerve ending secretes molecules of neurotransmitters into the synaptic cleft. These diffuse across the cleft and transmit the signal to the postsynaptic membrane.
	GO:0043195	terminal bouton	Terminal inflated portion of the axon, containing the specialized apparatus necessary to release neurotransmitters. The axon terminus is considered to be the whole region of thickening and the terminal bouton is a specialized region of it.

Chain C (RIMS2_RAT | Q9JIS1)

molecular function
	GO:0017137	Rab GTPase binding	Interacting selectively and non-covalently with Rab protein, any member of the Rab subfamily of the Ras superfamily of monomeric GTPases.
	GO:0044325	ion channel binding	Interacting selectively and non-covalently with one or more specific sites on an ion channel, a protein complex that spans a membrane and forms a water-filled channel across the phospholipid bilayer allowing selective ion transport down its electrochemical gradient.
	GO:0046872	metal ion binding	Interacting selectively and non-covalently with any metal ion.
	GO:0005515	protein binding	Interacting selectively and non-covalently with any protein or protein complex (a complex of two or more proteins that may include other nonprotein molecules).
	GO:0019904	protein domain specific binding	Interacting selectively and non-covalently with a specific domain of a protein.
	GO:0046982	protein heterodimerization activity	Interacting selectively and non-covalently with a nonidentical protein to form a heterodimer.
biological process
	GO:0019933	cAMP-mediated signaling	Any intracellular signal transduction in which the signal is passed on within the cell via cyclic AMP (cAMP). Includes production of cAMP, and downstream effectors that further transmit the signal within the cell.
	GO:0017156	calcium ion regulated exocytosis	The release of intracellular molecules (e.g. hormones, matrix proteins) contained within a membrane-bounded vesicle by fusion of the vesicle with the plasma membrane of a cell, induced by a rise in cytosolic calcium-ion levels.
	GO:0048791	calcium ion-regulated exocytosis of neurotransmitter	The release of a neurotransmitter into the synaptic cleft by exocytosis of synaptic vesicles, where the release step is dependent on a rise in cytosolic calcium ion levels.
	GO:0030154	cell differentiation	The process in which relatively unspecialized cells, e.g. embryonic or regenerative cells, acquire specialized structural and/or functional features that characterize the cells, tissues, or organs of the mature organism or some other relatively stable phase of the organism's life history. Differentiation includes the processes involved in commitment of a cell to a specific fate and its subsequent development to the mature state.
	GO:0006887	exocytosis	A process of secretion by a cell that results in the release of intracellular molecules (e.g. hormones, matrix proteins) contained within a membrane-bounded vesicle. Exocytosis can occur either by full fusion, when the vesicle collapses into the plasma membrane, or by a kiss-and-run mechanism that involves the formation of a transient contact, a pore, between a granule (for exemple of chromaffin cells) and the plasma membrane. The latter process most of the time leads to only partial secretion of the granule content. Exocytosis begins with steps that prepare vesicles for fusion with the membrane (tethering and docking) and ends when molecules are secreted from the cell.
	GO:0030073	insulin secretion	The regulated release of proinsulin from secretory granules (B granules) in the B cells of the pancreas; accompanied by cleavage of proinsulin to form mature insulin.
	GO:0006886	intracellular protein transport	The directed movement of proteins in a cell, including the movement of proteins between specific compartments or structures within a cell, such as organelles of a eukaryotic cell.
	GO:0006836	neurotransmitter transport	The directed movement of a neurotransmitter into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore. Neurotransmitters are any chemical substance that is capable of transmitting (or inhibiting the transmission of) a nerve impulse from a neuron to another cell.
	GO:2000463	positive regulation of excitatory postsynaptic potential	Any process that enhances the establishment or increases the extent of the excitatory postsynaptic potential (EPSP) which is a temporary increase in postsynaptic potential due to the flow of positively charged ions into the postsynaptic cell. The flow of ions that causes an EPSP is an excitatory postsynaptic current (EPSC) and makes it easier for the neuron to fire an action potential.
	GO:0010628	positive regulation of gene expression	Any process that increases the frequency, rate or extent of gene expression. Gene expression is the process in which a gene's coding sequence is converted into a mature gene product or products (proteins or RNA). This includes the production of an RNA transcript as well as any processing to produce a mature RNA product or an mRNA or circRNA (for protein-coding genes) and the translation of that mRNA or circRNA into protein. Protein maturation is included when required to form an active form of a product from an inactive precursor form.
	GO:0097151	positive regulation of inhibitory postsynaptic potential	Any process that activates or increases the frequency, rate or extent of inhibitory postsynaptic potential (IPSP). IPSP is a temporary decrease in postsynaptic membrane potential due to the flow of negatively charged ions into the postsynaptic cell. The flow of ions that causes an IPSP is an inhibitory postsynaptic current (IPSC) and makes it more difficult for the neuron to fire an action potential.
	GO:0017157	regulation of exocytosis	Any process that modulates the frequency, rate or extent of exocytosis.
	GO:0042391	regulation of membrane potential	Any process that modulates the establishment or extent of a membrane potential, the electric potential existing across any membrane arising from charges in the membrane itself and from the charges present in the media on either side of the membrane.
	GO:0061669	spontaneous neurotransmitter secretion	Neurotransmitter secretion that occurs in the absence of the action of a secretagogue or a presynaptic action potential.
	GO:0006810	transport	The directed movement of substances (such as macromolecules, small molecules, ions) or cellular components (such as complexes and organelles) into, out of or within a cell, or between cells, or within a multicellular organism by means of some agent such as a transporter, pore or motor protein.
cellular component
	GO:0030054	cell junction	A cellular component that forms a specialized region of connection between two or more cells or between a cell and the extracellular matrix. At a cell junction, anchoring proteins extend through the plasma membrane to link cytoskeletal proteins in one cell to cytoskeletal proteins in neighboring cells or to proteins in the extracellular matrix.
	GO:0005622	intracellular	The living contents of a cell; the matter contained within (but not including) the plasma membrane, usually taken to exclude large vacuoles and masses of secretory or ingested material. In eukaryotes it includes the nucleus and cytoplasm.
	GO:0016020	membrane	A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it.
	GO:0005886	plasma membrane	The membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins.
	GO:0048786	presynaptic active zone	A specialized region of the plasma membrane and cell cortex of a presynaptic neuron; encompasses a region of the plasma membrane where synaptic vesicles dock and fuse, and a specialized cortical cytoskeletal matrix.
	GO:0042734	presynaptic membrane	A specialized area of membrane of the axon terminal that faces the plasma membrane of the neuron or muscle fiber with which the axon terminal establishes a synaptic junction; many synaptic junctions exhibit structural presynaptic characteristics, such as conical, electron-dense internal protrusions, that distinguish it from the remainder of the axon plasma membrane.
	GO:0043234	protein complex	A stable macromolecular complex composed (only) of two or more polypeptide subunits along with any covalently attached molecules (such as lipid anchors or oligosaccharide) or non-protein prosthetic groups (such as nucleotides or metal ions). Prosthetic group in this context refers to a tightly bound cofactor. The component polypeptide subunits may be identical.
	GO:0045202	synapse	The junction between a nerve fiber of one neuron and another neuron, muscle fiber or glial cell. As the nerve fiber approaches the synapse it enlarges into a specialized structure, the presynaptic nerve ending, which contains mitochondria and synaptic vesicles. At the tip of the nerve ending is the presynaptic membrane; facing it, and separated from it by a minute cleft (the synaptic cleft) is a specialized area of membrane on the receiving cell, known as the postsynaptic membrane. In response to the arrival of nerve impulses, the presynaptic nerve ending secretes molecules of neurotransmitters into the synaptic cleft. These diffuse across the cleft and transmit the signal to the postsynaptic membrane.

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	RIMS2_RAT \| Q9JIS1	:	2a20 2bwq
	UN13A_RAT \| Q62768	:	1y8f 2cjt 2kdu 3kwt 3kwu 3swh 4y21 5ue8 5uf7

1y8f	SOLUTION STRUCTURE OF THE MUNC13-1 C1- DOMAIN
2a20	SOLUTION STRUCTURE OF RIM2 ZINC FINGER DOMAIN
2bwq	CRYSTAL STRUCTURE OF THE RIM2 C2A-DOMAIN AT 1.4 ANGSTROM RESOLUTION
2cjt	STRUCTURAL BASIS FOR A MUNC13-1 DIMERIC - MUNC13-1 - RIM HETERODIMER SWITCH: C2- DOMAINS AS VERSATILE PROTEIN-PROTEIN INTERACTION MODULES

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