2RCJ | pdb_00002rcj

Solution structure of human Immunoglobulin M

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
SAbDab Antibody Annotation
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
U	d2rcju1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	Immunoglobulin heavy chain gamma constant domain 1, CH1-gamma	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
R	d2rcjr1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	T-cell antigen receptor	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
R	d2rcjr2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	Immunoglobulin heavy chain gamma constant domain 1, CH1-gamma	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
Q	d2rcjq1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	T-cell antigen receptor	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
Q	d2rcjq2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	Immunoglobulin heavy chain gamma constant domain 1, CH1-gamma	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
N	d2rcjn1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	T-cell antigen receptor	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
N	d2rcjn2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	Immunoglobulin heavy chain gamma constant domain 1, CH1-gamma	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
M	d2rcjm1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	T-cell antigen receptor	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
M	d2rcjm2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	Immunoglobulin heavy chain gamma constant domain 1, CH1-gamma	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
J	d2rcjj1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	T-cell antigen receptor	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
J	d2rcjj2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	Immunoglobulin heavy chain gamma constant domain 1, CH1-gamma	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
I	d2rcji1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	T-cell antigen receptor	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
I	d2rcji2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	Immunoglobulin heavy chain gamma constant domain 1, CH1-gamma	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
F	d2rcjf1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	T-cell antigen receptor	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
F	d2rcjf2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	Immunoglobulin heavy chain gamma constant domain 1, CH1-gamma	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
E	d2rcje1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	T-cell antigen receptor	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
E	d2rcje2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	Immunoglobulin heavy chain gamma constant domain 1, CH1-gamma	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
B	d2rcjb1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	T-cell antigen receptor	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
B	d2rcjb2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	Immunoglobulin heavy chain gamma constant domain 1, CH1-gamma	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
A	d2rcja1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	T-cell antigen receptor	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
A	d2rcja2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	Immunoglobulin heavy chain gamma constant domain 1, CH1-gamma	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
R	SCOP2B Superfamily	Immunoglobulin (Ig) domain-like	8091519	3000071	SCOP2B (2022-06-29)
Q	SCOP2B Superfamily	Immunoglobulin (Ig) domain-like	8091519	3000071	SCOP2B (2022-06-29)
N	SCOP2B Superfamily	Immunoglobulin (Ig) domain-like	8091519	3000071	SCOP2B (2022-06-29)
M	SCOP2B Superfamily	Immunoglobulin (Ig) domain-like	8091519	3000071	SCOP2B (2022-06-29)
J	SCOP2B Superfamily	Immunoglobulin (Ig) domain-like	8091519	3000071	SCOP2B (2022-06-29)
I	SCOP2B Superfamily	Immunoglobulin (Ig) domain-like	8091519	3000071	SCOP2B (2022-06-29)
F	SCOP2B Superfamily	Immunoglobulin (Ig) domain-like	8091519	3000071	SCOP2B (2022-06-29)
E	SCOP2B Superfamily	Immunoglobulin (Ig) domain-like	8091519	3000071	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Immunoglobulin (Ig) domain-like	8091519	3000071	SCOP2B (2022-06-29)
A	SCOP2 Family	Antibody variable domains	8054454	4007744	SCOP2 (2022-06-29)
A	SCOP2 Family	Antibody constant domains	8055392	4007745	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Immunoglobulin (Ig) domain-like	8054455	3000071	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Immunoglobulin (Ig) domain-like	8055393	3000071	SCOP2 (2022-06-29)
A	SCOP2B Superfamily	Immunoglobulin (Ig) domain-like	8091519	3000071	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
T	Proteasome	e2rcjT1	A: alpha arrays	X: HTH	H: HTH	T: tetra-helical, lambda repressor-like	F: Proteasome	ECOD (v295.2)
S	Proteasome	e2rcjS1	A: alpha arrays	X: HTH	H: HTH	T: tetra-helical, lambda repressor-like	F: Proteasome	ECOD (v295.2)
P	Proteasome	e2rcjP1	A: alpha arrays	X: HTH	H: HTH	T: tetra-helical, lambda repressor-like	F: Proteasome	ECOD (v295.2)
O	Proteasome	e2rcjO1	A: alpha arrays	X: HTH	H: HTH	T: tetra-helical, lambda repressor-like	F: Proteasome	ECOD (v295.2)
L	Proteasome	e2rcjL1	A: alpha arrays	X: HTH	H: HTH	T: tetra-helical, lambda repressor-like	F: Proteasome	ECOD (v295.2)
K	Proteasome	e2rcjK1	A: alpha arrays	X: HTH	H: HTH	T: tetra-helical, lambda repressor-like	F: Proteasome	ECOD (v295.2)
H	Proteasome	e2rcjH1	A: alpha arrays	X: HTH	H: HTH	T: tetra-helical, lambda repressor-like	F: Proteasome	ECOD (v295.2)
G	Proteasome	e2rcjG1	A: alpha arrays	X: HTH	H: HTH	T: tetra-helical, lambda repressor-like	F: Proteasome	ECOD (v295.2)
D	Proteasome	e2rcjD1	A: alpha arrays	X: HTH	H: HTH	T: tetra-helical, lambda repressor-like	F: Proteasome	ECOD (v295.2)
C	V-set	e2rcjC1	A: alpha arrays	X: Profilin-like	H: sensor domains	T: sensor domains	F: V-set	ECOD (v295.2)
U	Copper-bind	e2rcjU1	A: alpha arrays	X: Phage tail fiber protein trimerization domain	H: Phage tail fiber protein trimerization domain	T: Phage tail fiber protein trimerization domain	F: Copper-bind	ECOD (v295.2)
R	Copper-bind	e2rcjR1	A: alpha arrays	X: Phage tail fiber protein trimerization domain	H: Phage tail fiber protein trimerization domain	T: Phage tail fiber protein trimerization domain	F: Copper-bind	ECOD (v295.2)
Q	Copper-bind	e2rcjQ1	A: alpha arrays	X: Phage tail fiber protein trimerization domain	H: Phage tail fiber protein trimerization domain	T: Phage tail fiber protein trimerization domain	F: Copper-bind	ECOD (v295.2)
N	Copper-bind	e2rcjN1	A: alpha arrays	X: Phage tail fiber protein trimerization domain	H: Phage tail fiber protein trimerization domain	T: Phage tail fiber protein trimerization domain	F: Copper-bind	ECOD (v295.2)
M	Copper-bind	e2rcjM1	A: alpha arrays	X: Phage tail fiber protein trimerization domain	H: Phage tail fiber protein trimerization domain	T: Phage tail fiber protein trimerization domain	F: Copper-bind	ECOD (v295.2)
J	Copper-bind	e2rcjJ1	A: alpha arrays	X: Phage tail fiber protein trimerization domain	H: Phage tail fiber protein trimerization domain	T: Phage tail fiber protein trimerization domain	F: Copper-bind	ECOD (v295.2)
I	Copper-bind	e2rcjI1	A: alpha arrays	X: Phage tail fiber protein trimerization domain	H: Phage tail fiber protein trimerization domain	T: Phage tail fiber protein trimerization domain	F: Copper-bind	ECOD (v295.2)
F	Copper-bind	e2rcjF1	A: alpha arrays	X: Phage tail fiber protein trimerization domain	H: Phage tail fiber protein trimerization domain	T: Phage tail fiber protein trimerization domain	F: Copper-bind	ECOD (v295.2)
E	Copper-bind	e2rcjE1	A: alpha arrays	X: Phage tail fiber protein trimerization domain	H: Phage tail fiber protein trimerization domain	T: Phage tail fiber protein trimerization domain	F: Copper-bind	ECOD (v295.2)
B	Copper-bind	e2rcjB1	A: alpha arrays	X: Phage tail fiber protein trimerization domain	H: Phage tail fiber protein trimerization domain	T: Phage tail fiber protein trimerization domain	F: Copper-bind	ECOD (v295.2)
A	Copper-bind	e2rcjA1	A: alpha arrays	X: Phage tail fiber protein trimerization domain	H: Phage tail fiber protein trimerization domain	T: Phage tail fiber protein trimerization domain	F: Copper-bind	ECOD (v295.2)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
C, D, G, H, K C, D, G, H, K, L, O, P, S, T	Light Chain	IGLV1	Lambda	-	SAbDab (2026-09-18)
A, B, E, F, I A, B, E, F, I, J, M, N, Q, R	Heavy Chain	IGHV3	-	-	SAbDab (2026-09-18)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B, E, F, I A, B, E, F, I, J, M, N, Q, R	PF07654	Immunoglobulin C1-set domain (C1-set)	Immunoglobulin C1-set domain		Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C, D, G, H, K C, D, G, H, K, L, O, P, S, T	IgA1 heavy chain	-	-	cell periphery cellular anatomical structure plasma membrane membrane extracellular region
U	J chain	-	-	cell periphery cellular anatomical structure plasma membrane membrane extracellular region
A, B, E, F, I A, B, E, F, I, J, M, N, Q, R	IgA1 light chain	protein-containing complex binding protein binding binding signaling receptor binding immunoglobulin receptor binding Fc-gamma receptor I complex binding antigen binding	adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains lymphocyte mediated immunity response to stimulus myeloid leukocyte mediated immunity inflammatory response to antigenic stimulus response to stress leukocyte mediated immunity antibody-dependent cellular cytotoxicity acute inflammatory response hypersensitivity defense response immune response leukocyte mediated cytotoxicity acute inflammatory response to antigenic stimulus adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains lymphocyte mediated immunity response to stimulus myeloid leukocyte mediated immunity inflammatory response to antigenic stimulus response to stress leukocyte mediated immunity antibody-dependent cellular cytotoxicity acute inflammatory response hypersensitivity defense response immune response leukocyte mediated cytotoxicity acute inflammatory response to antigenic stimulus immunoglobulin mediated immune response adaptive immune response immune effector process type II hypersensitivity immune system process type IIa hypersensitivity B cell mediated immunity cellular process inflammatory response cell killing cellular response to stimulus immune response-regulating cell surface receptor signaling pathway regulation of cellular process signaling positive regulation of biological process cell communication positive regulation of response to stimulus immune response-activating signaling pathway immune response-regulating signaling pathway positive regulation of immune response regulation of immune system process signal transduction positive regulation of immune system process regulation of biological process cell surface receptor signaling pathway immune response-activating cell surface receptor signaling pathway B cell receptor signaling pathway biological regulation regulation of response to stimulus regulation of immune response antigen receptor-mediated signaling pathway activation of immune response humoral immune response complement activation humoral immune response mediated by circulating immunoglobulin complement activation, classical pathway complement-dependent cytotoxicity biological process involved in interspecies interaction between organisms response to other organism antibacterial humoral response defense response to symbiont response to external stimulus antimicrobial humoral response response to biotic stimulus defense response to bacterium defense response to other organism response to bacterium response to external biotic stimulus	cellular anatomical structure extracellular region blood microparticle protein-containing complex extracellular protein-containing complex immunoglobulin complex, circulating immunoglobulin complex extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle organelle vesicle extracellular membrane-bounded organelle cellular anatomical structure extracellular region blood microparticle protein-containing complex extracellular protein-containing complex immunoglobulin complex, circulating immunoglobulin complex extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle organelle vesicle extracellular membrane-bounded organelle cell periphery plasma membrane membrane IgG immunoglobulin complex

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
C, D, G, H, K C, D, G, H, K, L, O, P, S, T	IPR003597	Immunoglobulin C1-set	Domain
C, D, G, H, K C, D, G, H, K, L, O, P, S, T	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
C, D, G, H, K C, D, G, H, K, L, O, P, S, T	IPR036179	Immunoglobulin-like domain superfamily	Homologous Superfamily
C, D, G, H, K C, D, G, H, K, L, O, P, S, T	IPR013106	Immunoglobulin V-set domain	Domain
C, D, G, H, K C, D, G, H, K, L, O, P, S, T	IPR003599	Immunoglobulin domain subtype	Domain
C, D, G, H, K C, D, G, H, K, L, O, P, S, T	IPR007110	Immunoglobulin-like domain	Domain
C, D, G, H, K C, D, G, H, K, L, O, P, S, T	IPR050380	Immune Recognition and Response Modulators	Family
C, D, G, H, K C, D, G, H, K, L, O, P, S, T	IPR003006	Immunoglobulin/major histocompatibility complex, conserved site	Conserved Site
U	IPR003597	Immunoglobulin C1-set	Domain
U	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
U	IPR036179	Immunoglobulin-like domain superfamily	Homologous Superfamily
U	IPR013106	Immunoglobulin V-set domain	Domain
U	IPR003599	Immunoglobulin domain subtype	Domain
U	IPR007110	Immunoglobulin-like domain	Domain
U	IPR050380	Immune Recognition and Response Modulators	Family
U	IPR003006	Immunoglobulin/major histocompatibility complex, conserved site	Conserved Site
A, B, E, F, I A, B, E, F, I, J, M, N, Q, R	IPR036179	Immunoglobulin-like domain superfamily	Homologous Superfamily
A, B, E, F, I A, B, E, F, I, J, M, N, Q, R	IPR050380	Immune Recognition and Response Modulators	Family
A, B, E, F, I A, B, E, F, I, J, M, N, Q, R	IPR003597	Immunoglobulin C1-set	Domain
A, B, E, F, I A, B, E, F, I, J, M, N, Q, R	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
A, B, E, F, I A, B, E, F, I, J, M, N, Q, R	IPR007110	Immunoglobulin-like domain	Domain
A, B, E, F, I A, B, E, F, I, J, M, N, Q, R	IPR003006	Immunoglobulin/major histocompatibility complex, conserved site	Conserved Site

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, B, E, F, I A, B, E, F, I, J, M, N, Q, R	: P01857	B-cell chronic lymphocytic leukemia myositis polycystic ovary syndrome plasma cell myeloma plasma cell neoplasm Sclerocystic Ovaries acquired idiopathic inflammatory myopathy lung adenocarcinoma ovarian cancer peripheral neuropathy Sjogren syndrome amyloidosis breast cancer medulloblastoma nasopharyngeal carcinoma B-cell chronic lymphocytic leukemia myositis polycystic ovary syndrome plasma cell myeloma plasma cell neoplasm Sclerocystic Ovaries acquired idiopathic inflammatory myopathy lung adenocarcinoma ovarian cancer peripheral neuropathy Sjogren syndrome amyloidosis breast cancer medulloblastoma nasopharyngeal carcinoma periodontitis interstitial cystitis myeloid neoplasm osteosarcoma peripheral nervous system disease