1Q3X - JenaLib

Asymmetric Unit (Jmol Viewer)

Asym. Unit - sites (Jmol Viewer)

Biological Unit 1 (Jmol Viewer)

Biol. Unit 1 - sites (Jmol Viewer)

Biological Unit 2 (Jmol Viewer)

Title :   CRYSTAL STRUCTURE OF THE CATALYTIC REGION OF HUMAN MASP-2

Authors :   V. Harmat, P. Gal, J. Kardos, K. Szilagyi, G. Ambrus, G. Naray-Szabo, P.

Date :   01 Aug 03 (Deposition) - 03 Aug 04 (Release) - 13 Jul 11 (Revision)

Method :   X-RAY DIFFRACTION

Resolution :   2.23

Chains :   Asym. Unit : A,B
Biol. Unit 1: A  (1x)
Biol. Unit 2: B  (1x)

Keywords :   Complement, Serine Protease, Modular Structure, Hinge Bending, Autoactivation, Hydrolase (Keyword Search: [Gene Ontology, PubMed, Web (Google)] )

Reference :   V. Harmat, P. Gal, J. Kardos, K. Szilagyi, G. Ambrus, B. Vegh, G. Naray-Szabo, P. Zavodsky
The Structure Of Mbl-Associated Serine Protease-2 Reveals That Identical Substrate Specificities Of C1S And Masp-2 Ar Realized Through Different Sets Of Enzyme-Substrate Interactions
J. Mol. Biol. V. 342 1533 2004
PubMed-ID: 15364579 | Reference-DOI: 10.1016/J.JMB.2004.07.014
(for further references see the PDB file header)

Molecule 1 - MANNAN-BINDING LECTIN SERINE PROTEASE 2
	Chains	:	A, B
	EC Number	:	3.4.21.-
	Engineered	:	YES
	Expression System	:	ESCHERICHIA COLI BL21(DE3)
	Expression System Plasmid	:	PET-17B
	Expression System Strain	:	BL21-DE3
	Expression System Taxid	:	469008
	Expression System Vector Type	:	PLASMID
	Fragment	:	CCP2-SP
	Gene	:	MASP2
	Organism Common	:	HUMAN
	Organism Scientific	:	HOMO SAPIENS
	Organism Taxid	:	9606
	Synonym	:	MANNOSE-BINDING PROTEIN ASSOCIATED SERINE PROTEASE 2, MASP- 2, MBL-ASSOCIATED SERINE PROTEASE 2

		1	2
Asymmetric Unit	:	A	B
Biological Unit 1 (1x)	:	A
Biological Unit 2 (1x)	:		B

Summary Information (see also Sequences/Alignments below)

Asymmetric Unit (2, 9)

No.	Name	Count	Type	Full Name
1	GOL	7	Ligand/Ion	GLYCEROL
2	NA	2	Ligand/Ion	SODIUM ION

Biological Unit 1 (1, 4)

No.	Name	Count	Type	Full Name
1	GOL	4	Ligand/Ion	GLYCEROL
2	NA	-1	Ligand/Ion	SODIUM ION

Biological Unit 2 (1, 3)

No.	Name	Count	Type	Full Name
1	GOL	3	Ligand/Ion	GLYCEROL
2	NA	-1	Ligand/Ion	SODIUM ION

Asymmetric Unit (9, 9)

No.	Name	Evidence	Residues	Description
1	AC1	SOFTWARE	SER A:657 , ASN A:659 , HOH A:804 , HOH A:805 , HOH A:806	BINDING SITE FOR RESIDUE NA A 800
2	AC2	SOFTWARE	ASP B:627 , SER B:657 , ASN B:659 , HOH B:854 , HOH B:855 , HOH B:1018	BINDING SITE FOR RESIDUE NA B 850
3	AC3	SOFTWARE	PRO A:432 , TYR A:474 , PRO A:550 , ILE A:551 , CYS A:552 , LEU A:553 , HOH A:900	BINDING SITE FOR RESIDUE GOL A 700
4	AC4	SOFTWARE	SER A:628 , CYS A:629 , ARG A:630 , SER A:633 , VAL A:653 , SER A:654 , TRP A:655 , HOH A:803 , HOH A:829	BINDING SITE FOR RESIDUE GOL A 701
5	AC5	SOFTWARE	PRO A:507 , HIS A:508 , TYR A:509	BINDING SITE FOR RESIDUE GOL A 702
6	AC6	SOFTWARE	LEU A:553 , ARG A:555 , ASP A:641 , THR A:644 , ARG A:646 , PHE A:648	BINDING SITE FOR RESIDUE GOL A 703
7	AC7	SOFTWARE	PRO B:432 , TYR B:474 , PRO B:550 , ILE B:551 , CYS B:552 , LEU B:553	BINDING SITE FOR RESIDUE GOL B 750
8	AC8	SOFTWARE	SER B:628 , CYS B:629 , ARG B:630 , SER B:633 , VAL B:653 , TRP B:655 , HOH B:851 , HOH B:853 , HOH B:883	BINDING SITE FOR RESIDUE GOL B 751
9	AC9	SOFTWARE	TYR B:474 , ASN B:476 , TRP B:477 , ILE B:683 , PHE B:686	BINDING SITE FOR RESIDUE GOL B 754

Asymmetric Unit

No.	Residues
1	A:366	-	A:412
2	A:396	-	A:430
3	A:434	-	A:552
4	A:598	-	A:618
5	A:629	-	A:660
6	B:366	-	B:412
7	B:396	-	B:430
8	B:434	-	B:552
9	B:598	-	B:618
10	B:629	-	B:660

Asymmetric Unit

No.	Residues
1	Pro A:605	-	Pro A:606
2	Pro B:605	-	Pro B:606

Asymmetric Unit (4, 8)

								dbSNP	PDB
No.	Source	Variant ID	Variant			UniProt ID	Status	ID	Chain	Variant
1	UniProt	VAR_028785	D	371	Y	MASP2_HUMAN	Polymorphism	12711521	A/B	D	371	Y
2	UniProt	VAR_028786	V	377	A	MASP2_HUMAN	Polymorphism	2273346	A/B	V	377	A
3	UniProt	VAR_075088	V	405	M	MASP2_HUMAN	Polymorphism	61735594	A/B	V	405	M
4	UniProt	VAR_028787	R	439	H	MASP2_HUMAN	Polymorphism	12085877	A/B	R	439	H

SNP/SAP Summary Statistics (UniProtKB/Swiss-Prot)

Biological Unit 1 (4, 4)

								dbSNP	PDB
No.	Source	Variant ID	Variant			UniProt ID	Status	ID	Chain	Variant
1	UniProt	VAR_028785	D	371	Y	MASP2_HUMAN	Polymorphism	12711521	A	D	371	Y
2	UniProt	VAR_028786	V	377	A	MASP2_HUMAN	Polymorphism	2273346	A	V	377	A
3	UniProt	VAR_075088	V	405	M	MASP2_HUMAN	Polymorphism	61735594	A	V	405	M
4	UniProt	VAR_028787	R	439	H	MASP2_HUMAN	Polymorphism	12085877	A	R	439	H

SNP/SAP Summary Statistics (UniProtKB/Swiss-Prot)

Biological Unit 2 (4, 4)

								dbSNP	PDB
No.	Source	Variant ID	Variant			UniProt ID	Status	ID	Chain	Variant
1	UniProt	VAR_028785	D	371	Y	MASP2_HUMAN	Polymorphism	12711521	B	D	371	Y
2	UniProt	VAR_028786	V	377	A	MASP2_HUMAN	Polymorphism	2273346	B	V	377	A
3	UniProt	VAR_075088	V	405	M	MASP2_HUMAN	Polymorphism	61735594	B	V	405	M
4	UniProt	VAR_028787	R	439	H	MASP2_HUMAN	Polymorphism	12085877	B	R	439	H

SNP/SAP Summary Statistics (UniProtKB/Swiss-Prot)

Asymmetric Unit (3, 5)

	PROSITE			UniProtKB		PDB
No.	ID	AC	Description	ID	Location	Count	Location
1	SUSHI	PS50923	Sushi/CCP/SCR domain profile.	MASP2_HUMAN	298-363 364-432	1	- A:364-432
2	TRYPSIN_DOM	PS50240	Serine proteases, trypsin domain profile.	MASP2_HUMAN	445-684	2	A:445-684 B:445-684
3	TRYPSIN_SER	PS00135	Serine proteases, trypsin family, serine active site.	MASP2_HUMAN	627-638	2	A:627-638 B:627-638

Biological Unit 1 (3, 3)

	PROSITE			UniProtKB		PDB
No.	ID	AC	Description	ID	Location	Count	Location
1	SUSHI	PS50923	Sushi/CCP/SCR domain profile.	MASP2_HUMAN	298-363 364-432	1	- A:364-432
2	TRYPSIN_DOM	PS50240	Serine proteases, trypsin domain profile.	MASP2_HUMAN	445-684	1	A:445-684 -
3	TRYPSIN_SER	PS00135	Serine proteases, trypsin family, serine active site.	MASP2_HUMAN	627-638	1	A:627-638 -

Biological Unit 2 (2, 2)

	PROSITE			UniProtKB		PDB
No.	ID	AC	Description	ID	Location	Count	Location
1	SUSHI	PS50923	Sushi/CCP/SCR domain profile.	MASP2_HUMAN	298-363 364-432	0	- -
2	TRYPSIN_DOM	PS50240	Serine proteases, trypsin domain profile.	MASP2_HUMAN	445-684	1	- B:445-684
3	TRYPSIN_SER	PS00135	Serine proteases, trypsin family, serine active site.	MASP2_HUMAN	627-638	1	- B:627-638

Asymmetric Unit (4, 7)

	ENSEMBL					UniProtKB			PDB
No.	Transcript ID	Exon	Exon ID	Genome Location	Length	ID	Location	Length	Count	Location	Length
1.1d	ENST00000400897	1d	ENSE00001833377	chr1:11107280-11107260	21	MASP2_HUMAN	1-2	2	0	-	-
1.2	ENST00000400897	2	ENSE00000818831	chr1:11107176-11106948	229	MASP2_HUMAN	2-78	77	0	-	-
1.3a	ENST00000400897	3a	ENSE00000472116	chr1:11106790-11106613	178	MASP2_HUMAN	79-138	60	0	-	-
1.3c	ENST00000400897	3c	ENSE00000743093	chr1:11105596-11105465	132	MASP2_HUMAN	138-182	45	0	-	-
1.4	ENST00000400897	4	ENSE00000472118	chr1:11103592-11103396	197	MASP2_HUMAN	182-247	66	0	-	-
1.5b	ENST00000400897	5b	ENSE00000743090	chr1:11103079-11102932	148	MASP2_HUMAN	248-297	50	0	-	-
1.6	ENST00000400897	6	ENSE00000472120	chr1:11097868-11097750	119	MASP2_HUMAN	297-336	40	0	-	-
1.7	ENST00000400897	7	ENSE00000743085	chr1:11094963-11094885	79	MASP2_HUMAN	337-363	27	1	A:362-363 -	2 -
1.8	ENST00000400897	8	ENSE00000743084	chr1:11090939-11090805	135	MASP2_HUMAN	363-408	46	2	A:363-408 B:366-408	46 43
1.9	ENST00000400897	9	ENSE00000472123	chr1:11090307-11090233	75	MASP2_HUMAN	408-433	26	2	A:408-433 B:408-433 (gaps)	26 26
1.10	ENST00000400897	10	ENSE00000818830	chr1:11087705-11086580	1126	MASP2_HUMAN	433-686	254	2	A:433-686 (gaps) B:433-686 (gaps)	254 254

Asymmetric 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:321
 aligned with MASP2_HUMAN | O00187 from UniProtKB/Swiss-Prot  Length:686

    Alignment length:325
                                   371       381       391       401       411       421       431       441       451       461       471       481       491       501       511       521       531       541       551       561       571       581       591       601       611       621       631       641       651       661       671       681     
          MASP2_HUMAN   362 SIVDCGPPDDLPSGRVEYITGPGVTTYKAVIQYSCEETFYTMKVNDGKYVCEADGFWTSSKGEKSLPVCEPVCGLSARTTGGRIYGGQKAKPGDFPWQVLILGGTTAAGALLYDNWVLTAAHAVYEQKHDASALDIRMGTLKRLSPHYTQAWSEAVFIHEGYTHDAGFDNDIALIKLNNKVVINSNITPICLPRKEAESFMRTDDIGTASGWGLTQRGFLARNLMYVDIPIVDHQKCTAAYEKPPYPRGSVTANMLCAGLESGGKDSCRGDSGGALVFLDSETERWFVGGIVSWGSMNCGEAGQYGVYTKVINYIPWIENIISDF 686
               SCOP domains ----d1q3xa2 A:366-440 Mannan-binding lectin serine protease 2 (MASP-2) domains ----d1q3xa1 A:445-686 Mannan-binding lectin serine protease 2 (MASP-2), catalytic domain                                                                                                                                                               SCOP domains
               CATH domains 1q3xA01 A:362-433 Complement Module, domain 1                           -----------1q3xA02       1q3xA03 A:459-550,A:675-682 Trypsin-like serine proteases                                   -1q3xA02 A:445-458,A:552-674 Trypsin-like serine proteases                                                                  1q3xA03 ---- CATH domains
               Pfam domains ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author .............eeeee...........eeeeee....eeee....eeee.....eee........eeee........----....ee........eeee.....eeeeee...eeeehhhhhhhhhh.....eeee..........eeeeeeeeee..............eeeee................hhhhhhhh....eeeeee.............eeeeeeeehhhhhhhhh.............eeee................eeeeee....eeeeeeeeee...........eeeee...hhhhhhhhhhhh Sec.struct. author
                 SAPs(SNPs) ---------Y-----A---------------------------M---------------------------------H------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                PROSITE (1) SUSUSHI  PDB: A:364-432 UniProt: 364-432                               ------------TRYPSIN_DOM  PDB: A:445-684 UniProt: 445-684                                                                                                                                                                                                    -- PROSITE (1)
                PROSITE (2) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------TRYPSIN_SER ------------------------------------------------ PROSITE (2)
           Transcript 1 (1) 1.---------------------------------------------------------------------Exon 1.10  PDB: A:433-686 (gaps) UniProt: 433-686                                                                                                                                                                                                              Transcript 1 (1)
           Transcript 1 (2) -Exon 1.8  PDB: A:363-408 UniProt: 363-408     -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript 1 (2)
           Transcript 1 (3) ----------------------------------------------Exon 1.9  PDB: A:408-433  ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript 1 (3)
                 1q3x A 362 TIVDCGPPDDLPSGRVEYITGPGVTTYKAVIQYSCEETFYTMKVNDGKYVCEADGFWTSSKGEKSLPVCEPVCGLSART----IYGGQKAKPGDFPWQVLILGGTTAAGALLYDNWVLTAAHAVYEQKHDASALDIRMGTLKRLSPHYTQAWSEAVFIHEGYTHDAGFDNDIALIKLNNKVVINSNITPICLPRKEAESFMRTDDIGTASGWGLTQRGFLARNLMYVDIPIVDHQKCTAAYEKPPYPRGSVTANMLCAGLESGGKDSCRGDSGGALVFLDSETERWFVGGIVSWGSMNCGEAGQYGVYTKVINYIPWIENIISDF 686
                                   371       381       391       401       411       421       431        |-   |   451       461       471       481       491       501       511       521       531       541       551       561       571       581       591       601       611       621       631       641       651       661       671       681     
                                                                                                        440  445

Chain B from PDB  Type:PROTEIN  Length:315
 aligned with MASP2_HUMAN | O00187 from UniProtKB/Swiss-Prot  Length:686

    Alignment length:321
                                   375       385       395       405       415       425       435       445       455       465       475       485       495       505       515       525       535       545       555       565       575       585       595       605       615       625       635       645       655       665       675       685 
          MASP2_HUMAN   366 CGPPDDLPSGRVEYITGPGVTTYKAVIQYSCEETFYTMKVNDGKYVCEADGFWTSSKGEKSLPVCEPVCGLSARTTGGRIYGGQKAKPGDFPWQVLILGGTTAAGALLYDNWVLTAAHAVYEQKHDASALDIRMGTLKRLSPHYTQAWSEAVFIHEGYTHDAGFDNDIALIKLNNKVVINSNITPICLPRKEAESFMRTDDIGTASGWGLTQRGFLARNLMYVDIPIVDHQKCTAAYEKPPYPRGSVTANMLCAGLESGGKDSCRGDSGGALVFLDSETERWFVGGIVSWGSMNCGEAGQYGVYTKVINYIPWIENIISDF 686
               SCOP domains d1q3xb2 B:366-440 Mannan-binding lectin serine    protease 2 (MASP-2) domai-   d1q3xb1 B:445-686 Mannan-binding lectin serine protease 2 (MASP-2), catalytic domain                                                                                                                                                               SCOP domains
               CATH domains 1q3xB01 B:366-433 Complement Module, domain 1                       --------   1q3xB02       1q3xB03 B:459-550,B:675-682 Trypsin-like serine proteases                                   -1q3xB02 B:445-458,B:552-674 Trypsin-like serine proteases                                                                  1q3xB03 ---- CATH domains
           Pfam domains (1) Sushi-1q3xB03 B:366-430                                          -----------   Trypsin-1q3xB01 B:445-679                                                                                                                                                                                                                  ------- Pfam domains (1)
           Pfam domains (2) Sushi-1q3xB04 B:366-430                                          -----------   Trypsin-1q3xB02 B:445-679                                                                                                                                                                                                                  ------- Pfam domains (2)
         Sec.struct. author .........eeeee...........eeeeee....eeee....eee.---...ee........eeee.........---....ee........eeee.....eeeeee...eeeehhhhhhhhhh.....eeee..........eeeeeeeeee..............eeeee................hhhhhhhh....eeeeee.............eeeeeeeehhhhhhhhh.............eeee................eeeeee....eeeeeeeeee...........eeeee...hhhhhhhhhhhh Sec.struct. author
                 SAPs(SNPs) -----Y-----A---------------------------M---------------------------------H------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                PROSITE (1) SUSHI  PDB: - UniProt: 364-432                                     ------------TRYPSIN_DOM  PDB: B:445-684 UniProt: 445-684                                                                                                                                                                                                    -- PROSITE (1)
                PROSITE (2) ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------TRYPSIN_SER ------------------------------------------------ PROSITE (2)
           Transcript 1 (1) -------------------------------------------------------------------Exon 1.10  PDB: B:433-686 (gaps) UniProt: 433-686                                                                                                                                                                                                              Transcript 1 (1)
           Transcript 1 (2) Exon 1.8  PDB: B:366-408 UniProt: 363-408  -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript 1 (2)
           Transcript 1 (3) ------------------------------------------Exon 1.9 UniProt: 408-433 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript 1 (3)
                 1q3x B 366 CGPPDDLPSGRVEYITGPGVTTYKAVIQYSCEETFYTMKVNDGKYVC---GFWTSSKGEKSLPVCEPVCGLSARTT---IYGGQKAKPGDFPWQVLILGGTTAAGALLYDNWVLTAAHAVYEQKHDASALDIRMGTLKRLSPHYTQAWSEAVFIHEGYTHDAGFDNDIALIKLNNKVVINSNITPICLPRKEAESFMRTDDIGTASGWGLTQRGFLARNLMYVDIPIVDHQKCTAAYEKPPYPRGSVTANMLCAGLESGGKDSCRGDSGGALVFLDSETERWFVGGIVSWGSMNCGEAGQYGVYTKVINYIPWIENIISDF 686
                                   375       385       395       405      |  -|      425       435     | 445       455       465       475       485       495       505       515       525       535       545       555       565       575       585       595       605       615       625       635       645       655       665       675       685 
                                                                        412 416                      441 445

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 Unit

Classes(

)

Architectures( (-)

)

Topologies( (-)

)

Homologous Superfamilies( (-)

)

Organisms( (-)

)

Class: Mainly Beta (13760)

Architecture: Beta Barrel (4804)

Topology: Thrombin, subunit H (1535)

Homologous Superfamily: Trypsin-like serine proteases (1488)

Human (Homo sapiens) (615)

1a	1q3xA03	A:459-550,A:675-682
1b	1q3xB03	B:459-550,B:675-682
1c	1q3xA02	A:445-458,A:552-674
1d	1q3xB02	B:445-458,B:552-674

Architecture: Ribbon (789)

Topology: Complement Module; domain 1 (62)

Homologous Superfamily: Complement Module, domain 1 (60)

Human (Homo sapiens) (46)

2a	1q3xB01	B:366-433
2b	1q3xA01	A:362-433

Asymmetric Unit

Clans(

)

Families(

)

Organisms( (-)

)

Clan: Peptidase_PA (797)

Family: Trypsin (679)

Homo sapiens (Human) (339)

1a	Trypsin-1q3xB01	B:445-679
1b	Trypsin-1q3xB02	B:445-679

Clan: no clan defined [family: Sushi] (50)

Family: Sushi (50)

Homo sapiens (Human) (42)

2a	Sushi-1q3xB03	B:366-430
2b	Sushi-1q3xB04	B:366-430

Asymmetric Unit(hide GO term definitions)

Chain A,B (MASP2_HUMAN | O00187)

molecular function
	GO:0005509	calcium ion binding	Interacting selectively and non-covalently with calcium ions (Ca2+).
	GO:0048306	calcium-dependent 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), in the presence of calcium.
	GO:0001855	complement component C4b binding	Interacting selectively and non-covalently with the C4b product of the classical complement cascade.
	GO:0016787	hydrolase activity	Catalysis of the hydrolysis of various bonds, e.g. C-O, C-N, C-C, phosphoric anhydride bonds, etc. Hydrolase is the systematic name for any enzyme of EC class 3.
	GO:0046872	metal ion binding	Interacting selectively and non-covalently with any metal ion.
	GO:0008233	peptidase activity	Catalysis of the hydrolysis of a peptide bond. A peptide bond is a covalent bond formed when the carbon atom from the carboxyl group of one amino acid shares electrons with the nitrogen atom from the amino group of a second amino acid.
	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:0004252	serine-type endopeptidase activity	Catalysis of the hydrolysis of internal, alpha-peptide bonds in a polypeptide chain by a catalytic mechanism that involves a catalytic triad consisting of a serine nucleophile that is activated by a proton relay involving an acidic residue (e.g. aspartate or glutamate) and a basic residue (usually histidine).
	GO:0008236	serine-type peptidase activity	Catalysis of the hydrolysis of peptide bonds in a polypeptide chain by a catalytic mechanism that involves a catalytic triad consisting of a serine nucleophile that is activated by a proton relay involving an acidic residue (e.g. aspartate or glutamate) and a basic residue (usually histidine).
biological process
	GO:0006956	complement activation	Any process involved in the activation of any of the steps of the complement cascade, which allows for the direct killing of microbes, the disposal of immune complexes, and the regulation of other immune processes; the initial steps of complement activation involve one of three pathways, the classical pathway, the alternative pathway, and the lectin pathway, all of which lead to the terminal complement pathway.
	GO:0006958	complement activation, classical pathway	Any process involved in the activation of any of the steps of the classical pathway of the complement cascade which allows for the direct killing of microbes, the disposal of immune complexes, and the regulation of other immune processes.
	GO:0001867	complement activation, lectin pathway	Any process involved in the activation of any of the steps of the lectin pathway of the complement cascade which allows for the direct killing of microbes and the regulation of other immune processes.
	GO:0002376	immune system process	Any process involved in the development or functioning of the immune system, an organismal system for calibrated responses to potential internal or invasive threats.
	GO:0045087	innate immune response	Innate immune responses are defense responses mediated by germline encoded components that directly recognize components of potential pathogens.
	GO:0006508	proteolysis	The hydrolysis of proteins into smaller polypeptides and/or amino acids by cleavage of their peptide bonds.
cellular component
	GO:0070062	extracellular exosome	A vesicle that is released into the extracellular region by fusion of the limiting endosomal membrane of a multivesicular body with the plasma membrane. Extracellular exosomes, also simply called exosomes, have a diameter of about 40-100 nm.
	GO:0005576	extracellular region	The space external to the outermost structure of a cell. For cells without external protective or external encapsulating structures this refers to space outside of the plasma membrane. This term covers the host cell environment outside an intracellular parasite.

Asymmetric Unit
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	Cis Peptide Bonds
		Pro A:605 - Pro A:606	[ RasMol ]
		Pro B:605 - Pro B:606	[ RasMol ]

Biological Units
	Complete Structure
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	1q3x
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	MASP2_HUMAN \| O00187
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	3.4.21.-
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	MASP2_HUMAN \| O00187
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UniProtKB/Swiss-Prot
	MASP2_HUMAN \| O00187	:	1szb 1zjk 3tvj 4fxg 5jpm

(no "Related Entries Specified in the PDB File" available for 1Q3X)

Description

Compounds

Structural Features

Chains, Units

Ligands, Modified Residues, Ions (2, 9)

Sites (9, 9)

SS Bonds (10, 10)

Cis Peptide Bonds (2, 2)

Sequence-Structure Mapping

SAPs(SNPs)/Variants (4, 8)

PROSITE Motifs (3, 5)

Exons (4, 7)

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SCOP Domains (2, 4)

CATH Domains (2, 6)

Pfam Domains (2, 4)

Gene Ontology (17, 17)

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Related Entries

Entries Sharing at Least One Protein Chain (UniProt ID)

Related Entries Specified in the PDB File