1T83 - JenaLib

Asym./Biol. Unit (Jmol Viewer)

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

Title :   CRYSTAL STRUCTURE OF A HUMAN TYPE III FC GAMMA RECEPTOR IN COMPLEX WITH AN FC FRAGMENT OF IGG1 (ORTHORHOMBIC)

Authors :   S. Radaev, S. Motyka, W. -H. Fridman, C. Sautes-Fridman, P. D. Sun

Date :   11 May 04 (Deposition) - 28 Sep 04 (Release) - 13 Jul 11 (Revision)

Method :   X-RAY DIFFRACTION

Resolution :   3.00

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

Keywords :   Fc Gamma Receptor, Igg1, Cd16, Fcgriii, Immunoglobulin, Immune System (Keyword Search: [Gene Ontology, PubMed, Web (Google)] )

Reference :   S. Radaev, S. Motyka, W. -H. Fridman, C. Sautes-Fridman, P. D. Sun
The Structure Of A Human Type Iii Fcgamma Receptor In Complex With Fc
J. Biol. Chem. V. 276 16469 2001
PubMed-ID: 11297532 | Reference-DOI: 10.1074/JBC.M100350200

Molecule 1 - IGG1
	Chains	:	A, B
	Fragment	:	FC
	Organism Common	:	HUMAN
	Organism Scientific	:	HOMO SAPIENS
	Organism Taxid	:	9606

Molecule 2 - LOW AFFINITY IMMUNOGLOBULIN GAMMA FC REGION RECEPTOR III-B
	Chains	:	C
	Engineered	:	YES
	Expression System	:	ESCHERICHIA COLI
	Expression System Strain	:	BL21(DE3)
	Expression System Taxid	:	469008
	Expression System Vector	:	28B
	Expression System Vector Type	:	PET
	Fragment	:	FC GAMMA RECEPTOR TYPE III
	Organism Common	:	HUMAN
	Organism Scientific	:	HOMO SAPIENS
	Organism Taxid	:	9606
	Synonym	:	IGG FC RECEPTOR III-1, FC-GAMMA RIII-BETA, FC-GAMMA RIIIB, FCRIIIB, FC-GAMMA RIII, FCRIII, CD16-B, FCR-10

		1	2	3
Asymmetric/Biological Unit	:	A	B	C

Summary Information (see also Sequences/Alignments below)

Asymmetric/Biological Unit (7, 17)

No.	Name	Count	Type	Full Name
1	BMA	3	Ligand/Ion	BETA-D-MANNOSE
2	FUL	2	Ligand/Ion	BETA-L-FUCOSE
3	GAL	1	Ligand/Ion	BETA-D-GALACTOSE
4	HG2	1	Ligand/Ion	DIBROMOMERCURY
5	MAN	3	Ligand/Ion	ALPHA-D-MANNOSE
6	NAG	4	Ligand/Ion	N-ACETYL-D-GLUCOSAMINE
7	NDG	3	Ligand/Ion	2-(ACETYLAMINO)-2-DEOXY-A-D-GLUCOPYRANOSE

Asymmetric Unit (17, 17)

No.	Name	Evidence	Residues	Description
01	AC1	SOFTWARE	ASP A:265 , ASN A:297 , NAG A:449 , FUL A:455 , LYS C:120	BINDING SITE FOR RESIDUE NDG A 448
02	AC2	SOFTWARE	PHE A:241 , VAL A:264 , NDG A:448 , BMA A:450 , MAN A:452 , FUL A:455	BINDING SITE FOR RESIDUE NAG A 449
03	AC3	SOFTWARE	PHE A:241 , PHE A:243 , NAG A:449 , BMA A:451 , MAN A:452	BINDING SITE FOR RESIDUE BMA A 450
04	AC4	SOFTWARE	PHE A:241 , BMA A:450	BINDING SITE FOR RESIDUE BMA A 451
05	AC5	SOFTWARE	PHE A:243 , NAG A:449 , BMA A:450 , NDG A:453	BINDING SITE FOR RESIDUE MAN A 452
06	AC6	SOFTWARE	PHE A:243 , LYS A:246 , THR A:260 , MAN A:452 , GAL A:454 , ASN B:384	BINDING SITE FOR RESIDUE NDG A 453
07	AC7	SOFTWARE	PHE A:243 , PRO A:244 , PRO A:245 , LYS A:246 , GLU A:258 , THR A:260 , NDG A:453	BINDING SITE FOR RESIDUE GAL A 454
08	AC8	SOFTWARE	GLN A:295 , NDG A:448 , NAG A:449	BINDING SITE FOR RESIDUE FUL A 455
09	AC9	SOFTWARE	HOH B:130 , PRO B:232 , LEU B:234 , ASP B:265 , GLU B:294 , ASN B:297 , THR B:299 , NDG B:449 , FUL B:455	BINDING SITE FOR RESIDUE NAG B 448
10	BC1	SOFTWARE	PHE B:241 , VAL B:264 , GLU B:294 , ARG B:301 , NAG B:448 , BMA B:450 , FUL B:455	BINDING SITE FOR RESIDUE NDG B 449
11	BC2	SOFTWARE	PHE B:241 , PHE B:243 , NDG B:449 , MAN B:451 , MAN B:452	BINDING SITE FOR RESIDUE BMA B 450
12	BC3	SOFTWARE	HOH B:159 , PHE B:241 , BMA B:450 , NAG B:454	BINDING SITE FOR RESIDUE MAN B 451
13	BC4	SOFTWARE	BMA B:450 , NAG B:453	BINDING SITE FOR RESIDUE MAN B 452
14	BC5	SOFTWARE	ASN A:384 , HOH B:32 , PHE B:243 , LYS B:246 , MAN B:452	BINDING SITE FOR RESIDUE NAG B 453
15	BC6	SOFTWARE	HOH B:159 , PHE B:241 , MAN B:451	BINDING SITE FOR RESIDUE NAG B 454
16	BC7	SOFTWARE	HOH A:58 , GLU B:294 , NAG B:448 , NDG B:449	BINDING SITE FOR RESIDUE FUL B 455
17	BC8	SOFTWARE	LYS A:248 , MET A:252 , SER A:254 , MET B:252	BINDING SITE FOR RESIDUE HG2 A 456

Asymmetric/Biological Unit

No.	Residues
1	A:261	-	A:321
2	A:367	-	A:425
3	B:261	-	B:321
4	B:367	-	B:425
5	C:29	-	C:71
6	C:110	-	C:154

Asymmetric/Biological Unit

No.	Residues
1	Tyr A:373	-	Pro A:374
2	Tyr B:373	-	Pro B:374
3	Glu C:13	-	Pro C:14

Asymmetric/Biological Unit (7, 9)

								dbSNP	PDB
No.	Source	Variant ID	Variant			UniProt ID	Status	ID	Chain	Variant
1	UniProt	VAR_003956	S	36	R	FCG3B_HUMAN	Polymorphism	---	C	S	18	R
2	UniProt	VAR_003963	S	65	N	FCG3B_HUMAN	Polymorphism	448740	C	S	47	N
3	UniProt	VAR_008802	A	78	D	FCG3B_HUMAN	Polymorphism	5030738	C	A	60	D
4	UniProt	VAR_003957	N	82	D	FCG3B_HUMAN	Polymorphism	---	C	N	64	D
5	UniProt	VAR_003964	I	106	V	FCG3B_HUMAN	Polymorphism	---	C	I	88	V
6	UniProt	VAR_003887	D	239	E	IGHG1_HUMAN	Polymorphism	---	A/B	E	356	E
7	UniProt	VAR_003888	L	241	M	IGHG1_HUMAN	Polymorphism	---	A/B	M	358	M

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

Asymmetric/Biological Unit (1, 2)

	PROSITE			UniProtKB		PDB
No.	ID	AC	Description	ID	Location	Count	Location
1	IG_MHC	PS00290	Immunoglobulins and major histocompatibility complex proteins signature.	IGHG1_HUMAN	81-87 306-312	2	- A:423-429 B:423-429

Asymmetric/Biological Unit (4, 6)

	ENSEMBL					UniProtKB			PDB
No.	Transcript ID	Exon	Exon ID	Genome Location	Length	ID	Location	Length	Count	Location	Length
1.2a	ENST00000294800	2a	ENSE00001446005	chr1:161601158-161600845	314	FCG3B_HUMAN	1-14	14	0	-	-
1.4a	ENST00000294800	4a	ENSE00001613649	chr1:161600178-161600158	21	FCG3B_HUMAN	14-21	8	0	-	-
1.4d	ENST00000294800	4d	ENSE00001657788	chr1:161599825-161599568	258	FCG3B_HUMAN	21-107	87	1	C:5-89	85
1.5c	ENST00000294800	5c	ENSE00001623884	chr1:161596192-161595935	258	FCG3B_HUMAN	107-193	87	1	C:89-171	83
1.6c	ENST00000294800	6c	ENSE00001270482	chr1:161594429-161592992	1438	FCG3B_HUMAN	193-233	41	0	-	-

2.1	ENST00000390549	1	ENSE00001838294	chr14:106209408-106209114	295	IGHG1_HUMAN	1-99	99	0	-	-
2.2	ENST00000390549	2	ENSE00001719055	chr14:106208722-106208678	45	IGHG1_HUMAN	99-114	16	0	-	-
2.3b	ENST00000390549	3b	ENSE00001776617	chr14:106208559-106208230	330	IGHG1_HUMAN	114-224	111	2	A:235-341 B:232-341	107 110
2.4c	ENST00000390549	4c	ENSE00001837466	chr14:106208132-106207675	458	IGHG1_HUMAN	224-330	107	2	A:341-444 B:341-443	104 103

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:210
 aligned with IGHG1_HUMAN | P01857 from UniProtKB/Swiss-Prot  Length:330

    Alignment length:210
                                   127       137       147       157       167       177       187       197       207       217       227       237       247       257       267       277       287       297       307       317       327
          IGHG1_HUMAN   118 LGGPSVFLFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPIEKTISKAKGQPREPQVYTLPPSRDELTKNQVSLTCLVKGFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLS 327
               SCOP domains d1t83a1 A:235-341 Immunoglobulin heavy chain gamma constant domain 2, CH2-gamma                            d1t83a2 A:342-443 Immunoglobulin heavy chain gamma constant domain 3, CH3-gamma                       - SCOP domains
               CATH domains ---1t83A01 A:238-337 Immunoglobulins                                                                   1t83A02 A:338-443 Immunoglobulins                                                                         - CATH domains
               Pfam domains ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Pfam domains
         Sec.struct. author ....eeeee..hhhhhhh.....eeeeeeeee.......eeeeee..eee...ee..........eeeeeeee.hhhhhhhh....eeee.......eee............eeeee..hhhhhh..eeeeeeeeeee.....eeeee........eee...ee.....eeeeeeeeeehhhhhhh..eeeeee........eeeee... Sec.struct. author
                 SAPs(SNPs) -------------------------------------------------------------------------------------------------------------------------E-M-------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------IG_MHC --------------- PROSITE
           Transcript 2 (1) Exon 2.3b  PDB: A:235-341 UniProt: 114-224 [INCOMPLETE]                                                    ------------------------------------------------------------------------------------------------------- Transcript 2 (1)
           Transcript 2 (2) ----------------------------------------------------------------------------------------------------------Exon 2.4c  PDB: A:341-444 UniProt: 224-330 [INCOMPLETE]                                                  Transcript 2 (2)
                 1t83 A 235 LGGPSVFLFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLS 444
                                   244       254       264       274       284       294       304       314       324       334       344       354       364       374       384       394       404       414       424       434       444

Chain B from PDB  Type:PROTEIN  Length:212
 aligned with IGHG1_HUMAN | P01857 from UniProtKB/Swiss-Prot  Length:330

    Alignment length:212
                                   124       134       144       154       164       174       184       194       204       214       224       234       244       254       264       274       284       294       304       314       324  
          IGHG1_HUMAN   115 PELLGGPSVFLFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPIEKTISKAKGQPREPQVYTLPPSRDELTKNQVSLTCLVKGFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVMHEALHNHYTQKSLSL 326
               SCOP domains ---d1t83b1 B:235-341 Immunoglobulin heavy chain gamma constant domain 2, CH2-gamma                            d1t83b2 B:342-443 Immunoglobulin heavy chain gamma constant domain 3, CH3-gamma                        SCOP domains
               CATH domains ------1t83B01 B:238-337 Immunoglobulins                                                                   1t83B02 B:338-443 Immunoglobulins                                                                          CATH domains
           Pfam domains (1) ------------------------------------------------------------------------------------------------------------------------C1-set-1t83B01 B:352-437                                                              ------ Pfam domains (1)
           Pfam domains (2) ------------------------------------------------------------------------------------------------------------------------C1-set-1t83B02 B:352-437                                                              ------ Pfam domains (2)
           Pfam domains (3) ------------------------------------------------------------------------------------------------------------------------C1-set-1t83B03 B:352-437                                                              ------ Pfam domains (3)
           Pfam domains (4) ------------------------------------------------------------------------------------------------------------------------C1-set-1t83B04 B:352-437                                                              ------ Pfam domains (4)
         Sec.struct. author .......eeeee..hhhhhhh.....eeeeeeeee..........eee..eee..eeee..ee....eeeeeeeee...........eeeee........eeeee..........eeeee..hhhhh...eeeeeeeeeee.....eeeee........eee...ee.....eeeeeeeeeehhhhhh...eeeeee........eeeee.. Sec.struct. author
                 SAPs(SNPs) ----------------------------------------------------------------------------------------------------------------------------E-M------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------IG_MHC -------------- PROSITE
           Transcript 2 (1) Exon 2.3b  PDB: B:232-341 UniProt: 114-224 [INCOMPLETE]                                                       ------------------------------------------------------------------------------------------------------ Transcript 2 (1)
           Transcript 2 (2) -------------------------------------------------------------------------------------------------------------Exon 2.4c  PDB: B:341-443 UniProt: 224-330 [INCOMPLETE]                                                 Transcript 2 (2)
                 1t83 B 232 PELLGGPSVFLFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVMHEALHNHYTQKSLSL 443
                                   241       251       261       271       281       291       301       311       321       331       341       351       361       371       381       391       401       411       421       431       441

Chain C from PDB  Type:PROTEIN  Length:167
 aligned with FCG3B_HUMAN | O75015 from UniProtKB/Swiss-Prot  Length:233

    Alignment length:167
                                    32        42        52        62        72        82        92       102       112       122       132       142       152       162       172       182       
          FCG3B_HUMAN    23 LPKAVVFLEPQWYSVLEKDSVTLKCQGAYSPEDNSTQWFHNESLISSQASSYFIDAATVNDSGEYRCQTNLSTLSDPVQLEVHIGWLLLQAPRWVFKEEDPIHLRCHSWKNTALHKVTYLQNGKDRKYFHHNSDFHIPKATLKDSGSYFCRGLVGSKNVSSETVNIT 189
               SCOP domains d1t83c1 C:5-86 Fc gamma receptor ectodomain (CD32)                                d1t83c2 C:87-171 Fc gamma receptor ectodomain (CD32)                                  SCOP domains
               CATH domains 1t83C01 C:5-89 Immunoglobulins                                                       1t83C02 C:90-171 Immunoglobulins                                                   CATH domains
           Pfam domains (1) -------------------------------------------------------------------------------------Ig_2-1t83C01 C:90-171                                                              Pfam domains (1)
           Pfam domains (2) -------------------------------------------------------------------------------------Ig_2-1t83C02 C:90-171                                                              Pfam domains (2)
         Sec.struct. author ....eeeee....eee....eeeeee..........eeee..eee.....eeee...hhhhheeeeee..........eeeee...eeee...........eeeeeee.hhh.eeeeeeee...eeeeeee..eeee........eeeeeeeee..eeee...eee. Sec.struct. author
                 SAPs(SNPs) -------------R----------------------------N------------D---D-----------------------V----------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE ----------------------------------------------------------------------------------------------------------------------------------------------------------------------- PROSITE
           Transcript 1 (1) Exon 1.4d  PDB: C:5-89 UniProt: 21-107 [INCOMPLETE]                                  ---------------------------------------------------------------------------------- Transcript 1 (1)
           Transcript 1 (2) ------------------------------------------------------------------------------------Exon 1.5c  PDB: C:89-171 UniProt: 107-193 [INCOMPLETE]                              Transcript 1 (2)
                 1t83 C   5 LPKAVVFLEPQWYSVLEKDSVTLKCQGAYSPEDNSTQWFHNESLISSQASSYFIDAATVNDSGEYRCQTNLSTLSDPVQLEVHIGWLLLQAPRWVFKEEDPIHLRCHSWKNTALHKVTYLQNGKDRKYFHHNSDFHIPKATLKDSGSYFCRGLVGSKNVSSETVNIT 171
                                    14        24        34        44        54        64        74        84        94       104       114       124       134       144       154       164

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(

)

Architectures( (-)

)

Topologies( (-)

)

Homologous Superfamilies( (-)

)

Organisms( (-)

)

Class: Mainly Beta (13760)

Architecture: Sandwich (5577)

Topology: Immunoglobulin-like (3897)

Homologous Superfamily: Immunoglobulins (2282)

Human (Homo sapiens) (912)

1a	1t83A02	A:338-443
1b	1t83B02	B:338-443
1c	1t83A01	A:238-337
1d	1t83B01	B:238-337
1e	1t83C02	C:90-171
1f	1t83C01	C:5-89

Asymmetric/Biological Unit

Clans(

)

Families(

)

Organisms( (-)

)

Clan: Ig (577)

Family: C1-set (338)

Homo sapiens (Human) (218)

1a	C1-set-1t83B01	B:352-437
1b	C1-set-1t83B02	B:352-437
1c	C1-set-1t83B03	B:352-437
1d	C1-set-1t83B04	B:352-437

Family: Ig_2 (52)

Homo sapiens (Human) (39)

2a	Ig_2-1t83C01	C:90-171
2b	Ig_2-1t83C02	C:90-171

Asymmetric/Biological Unit(hide GO term definitions)

Chain A,B (IGHG1_HUMAN | P01857)

molecular function
	GO:0003823	antigen binding	Interacting selectively and non-covalently with an antigen, any substance which is capable of inducing a specific immune response and of reacting with the products of that response, the specific antibody or specifically sensitized T-lymphocytes, or both. Binding may counteract the biological activity of the antigen.
	GO:0034987	immunoglobulin receptor binding	Interacting selectively and non-covalently with one or more specific sites on an immunoglobulin receptor molecule.
	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).
biological process
	GO:0050853	B cell receptor signaling pathway	A series of molecular signals initiated by the cross-linking of an antigen receptor on a B cell.
	GO:0038096	Fc-gamma receptor signaling pathway involved in phagocytosis	An Fc-gamma receptor signaling pathway that contributes to the endocytic engulfment of external particulate material by phagocytes.
	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:0042742	defense response to bacterium	Reactions triggered in response to the presence of a bacterium that act to protect the cell or organism.
	GO:0045087	innate immune response	Innate immune responses are defense responses mediated by germline encoded components that directly recognize components of potential pathogens.
	GO:0006911	phagocytosis, engulfment	The internalization of bacteria, immune complexes and other particulate matter or of an apoptotic cell by phagocytosis, including the membrane and cytoskeletal processes required, which involves one of three mechanisms: zippering of pseudopods around a target via repeated receptor-ligand interactions, sinking of the target directly into plasma membrane of the phagocytosing cell, or induced uptake via an enhanced membrane ruffling of the phagocytosing cell similar to macropinocytosis.
	GO:0006910	phagocytosis, recognition	The initial step in phagocytosis involving adhesion to bacteria, immune complexes and other particulate matter, or an apoptotic cell and based on recognition of factors such as bacterial cell wall components, opsonins like complement and antibody or protein receptors and lipids like phosphatidyl serine, and leading to intracellular signaling in the phagocytosing cell.
	GO:0050871	positive regulation of B cell activation	Any process that activates or increases the frequency, rate or extent of B cell activation.
	GO:0006508	proteolysis	The hydrolysis of proteins into smaller polypeptides and/or amino acids by cleavage of their peptide bonds.
cellular component
	GO:0072562	blood microparticle	A phospholipid microvesicle that is derived from any of several cell types, such as platelets, blood cells, endothelial cells, or others, and contains membrane receptors as well as other proteins characteristic of the parental cell. Microparticles are heterogeneous in size, and are characterized as microvesicles free of nucleic acids.
	GO:0009897	external side of plasma membrane	The leaflet of the plasma membrane that faces away from the cytoplasm and any proteins embedded or anchored in it or attached to its surface.
	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.
	GO:0005615	extracellular space	That part of a multicellular organism outside the cells proper, usually taken to be outside the plasma membranes, and occupied by fluid.
	GO:0042571	immunoglobulin complex, circulating	An immunoglobulin complex that is secreted into extracellular space and found in mucosal areas or other tissues or circulating in the blood or lymph. In its canonical form, a circulating immunoglobulin complex is composed of two identical heavy chains and two identical light chains, held together by disulfide bonds. Some forms of are polymers of the basic structure and contain additional components such as J-chain and the secretory component.

Chain C (FCG3B_HUMAN | O75015)

molecular function
	GO:0019864	IgG binding	Interacting selectively and non-covalently with an immunoglobulin of an IgG isotype.
biological process
	GO:0006955	immune response	Any immune system process that functions in the calibrated response of an organism to a potential internal or invasive threat.
	GO:0002230	positive regulation of defense response to virus by host	Any host process that results in the promotion of antiviral immune response mechanisms, thereby limiting viral replication.
	GO:0098779	positive regulation of macromitophagy in response to mitochondrial depolarization	The macromitophagy process that is triggered by a detection of the loss of mitochondrial membrane potential.
	GO:0098792	xenophagy	The macroautophagy process in which a region of cytoplasm containing an intracellular pathogen or some part of an intracellular pathogen (e.g. viral capsid) is enclosed in a double membrane bound autophagosome, which then fuses with the lysosome leading to degradation of the contents.
cellular component
	GO:0031225	anchored component of membrane	The component of a membrane consisting of the gene products that are tethered to the membrane only by a covalently attached anchor, such as a lipid group that is embedded in the membrane. Gene products with peptide sequences that are embedded in the membrane are excluded from this grouping.
	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.
	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.

Asymmetric/Biological Unit
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	Cis Peptide Bonds
		Glu C:13 - Pro C:14	[ RasMol ]
		Tyr A:373 - Pro A:374	[ RasMol ]
		Tyr B:373 - Pro B:374	[ RasMol ]

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	1t83
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	FCG3B_HUMAN \| O75015
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	IGHG1_HUMAN \| P01857
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1e4k	CRYSTAL STRUCTURE OF SOLUBLE HUMAN IGG1 FC FRAGMENT-FC- RECEPTOR III COMPLEX
1f6a	STRUCTURE OF THE HUMAN IGE-FC BOUND TO ITS HIGH AFFINITY RECEPTOR FC(E)RI(A)
1fnl	CRYSTAL STRUCTURE OF THE EXTRACELLULAR DOMAIN OF A HUMAN FCGRIII
1iis	CRYSTAL STRUCTURE OF A HUMAN FCG RECEPTOR IN COMPLEX WITH AN FC FRAGMENT OF IGG1 (ORTHORHOMBIC)
1iix	CRYSTAL STRUCTURE OF A HUMAN FCG RECEPTOR IN COMPLEX WITH AN FC FRAGMENT OF IGG1 (HEXAGONAL)
1t89	CRYSTAL STRUCTURE OF A HUMAN TYPE III FC GAMMA RECEPTOR IN COMPLEX WITH AN FC FRAGMENT OF IGG1 (HEXAGONAL)

Description

Compounds

Structural Features

Chains, Units

Ligands, Modified Residues, Ions (7, 17)

Sites (17, 17)

SS Bonds (6, 6)

Cis Peptide Bonds (3, 3)

Sequence-Structure Mapping

SAPs(SNPs)/Variants (7, 9)

PROSITE Motifs (1, 2)

Exons (4, 6)

Sequences/Alignments

Classification and Annotation

SCOP Domains (3, 6)

CATH Domains (1, 6)

Pfam Domains (2, 6)

Gene Ontology (28, 30)

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Related Entries

Entries Sharing at Least One Protein Chain (UniProt ID)

Related Entries Specified in the PDB File