Annotations: 3SQG

Crystal structure of a methyl-coenzyme M reductase purified from Black Sea mats

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Protein Modification Annotation

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
H	d3sqgh2	All alpha proteins	Methyl-coenzyme M reductase alpha and beta chain C-terminal domain	Methyl-coenzyme M reductase alpha and beta chain C-terminal domain	automated matches	automated matches	(uncultured archaeon ) [TaxId: 115547 ],	SCOPe (2.08)
H	d3sqgh1	Alpha and beta proteins (a+b)	Ferredoxin-like	Methyl-coenzyme M reductase subunits	automated matches	automated matches	(uncultured archaeon ) [TaxId: 115547 ],	SCOPe (2.08)
E	d3sqge2	All alpha proteins	Methyl-coenzyme M reductase alpha and beta chain C-terminal domain	Methyl-coenzyme M reductase alpha and beta chain C-terminal domain	automated matches	automated matches	(uncultured archaeon ) [TaxId: 115547 ],	SCOPe (2.08)
E	d3sqge1	Alpha and beta proteins (a+b)	Ferredoxin-like	Methyl-coenzyme M reductase subunits	automated matches	automated matches	(uncultured archaeon ) [TaxId: 115547 ],	SCOPe (2.08)
B	d3sqgb2	All alpha proteins	Methyl-coenzyme M reductase alpha and beta chain C-terminal domain	Methyl-coenzyme M reductase alpha and beta chain C-terminal domain	automated matches	automated matches	(uncultured archaeon ) [TaxId: 115547 ],	SCOPe (2.08)
B	d3sqgb1	Alpha and beta proteins (a+b)	Ferredoxin-like	Methyl-coenzyme M reductase subunits	automated matches	automated matches	(uncultured archaeon ) [TaxId: 115547 ],	SCOPe (2.08)
G	d3sqgg2	All alpha proteins	Methyl-coenzyme M reductase alpha and beta chain C-terminal domain	Methyl-coenzyme M reductase alpha and beta chain C-terminal domain	automated matches	automated matches	(uncultured archaeon ) [TaxId: 115547 ],	SCOPe (2.08)
G	d3sqgg1	Alpha and beta proteins (a+b)	Ferredoxin-like	Methyl-coenzyme M reductase subunits	automated matches	automated matches	(uncultured archaeon ) [TaxId: 115547 ],	SCOPe (2.08)
D	d3sqgd2	All alpha proteins	Methyl-coenzyme M reductase alpha and beta chain C-terminal domain	Methyl-coenzyme M reductase alpha and beta chain C-terminal domain	automated matches	automated matches	(uncultured archaeon ) [TaxId: 115547 ],	SCOPe (2.08)
D	d3sqgd1	Alpha and beta proteins (a+b)	Ferredoxin-like	Methyl-coenzyme M reductase subunits	automated matches	automated matches	(uncultured archaeon ) [TaxId: 115547 ],	SCOPe (2.08)
A	d3sqga2	All alpha proteins	Methyl-coenzyme M reductase alpha and beta chain C-terminal domain	Methyl-coenzyme M reductase alpha and beta chain C-terminal domain	automated matches	automated matches	(uncultured archaeon ) [TaxId: 115547 ],	SCOPe (2.08)
A	d3sqga1	Alpha and beta proteins (a+b)	Ferredoxin-like	Methyl-coenzyme M reductase subunits	automated matches	automated matches	(uncultured archaeon ) [TaxId: 115547 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
C	SCOP2 Family	Methyl-coenzyme M reductase gamma chain	8073482	4001330	SCOP2 (2022-06-29)
C	SCOP2 Superfamily	Methyl-coenzyme M reductase subunits	8073483	3001305	SCOP2 (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
I	PK_Tyr_Ser-Thr	e3sqgI1	A: alpha arrays	X: Alpha-beta plaits	H: Phage tail protein-like	T: Transmembrane protein 14A	F: PK_Tyr_Ser-Thr	ECOD (v295.2)
F	PK_Tyr_Ser-Thr	e3sqgF1	A: alpha arrays	X: Alpha-beta plaits	H: Phage tail protein-like	T: Transmembrane protein 14A	F: PK_Tyr_Ser-Thr	ECOD (v295.2)
C	MCR_gamma	e3sqgC1	A: alpha arrays	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Prealbumin-like	F: MCR_gamma	ECOD (v295.2)
H	PK_Tyr_Ser-Thr	e3sqgH1	A: alpha arrays	X: Alpha-beta plaits	H: Phage tail protein-like	T: Transmembrane protein 14A	F: PK_Tyr_Ser-Thr	ECOD (v295.2)
E	PK_Tyr_Ser-Thr	e3sqgE1	A: alpha arrays	X: Alpha-beta plaits	H: Phage tail protein-like	T: Transmembrane protein 14A	F: PK_Tyr_Ser-Thr	ECOD (v295.2)
B	H2TH	e3sqgB1	A: alpha arrays	X: OB-fold	H: RIFT-related	T: Phage tail proteins	F: H2TH	ECOD (v295.2)
G	PK_Tyr_Ser-Thr	e3sqgG1	A: alpha arrays	X: Alpha-beta plaits	H: Phage tail protein-like	T: Transmembrane protein 14A	F: PK_Tyr_Ser-Thr	ECOD (v295.2)
D	PK_Tyr_Ser-Thr	e3sqgD1	A: alpha arrays	X: Alpha-beta plaits	H: Phage tail protein-like	T: Transmembrane protein 14A	F: PK_Tyr_Ser-Thr	ECOD (v295.2)
A	H2TH	e3sqgA1	A: alpha arrays	X: OB-fold	H: RIFT-related	T: Phage tail proteins	F: H2TH	ECOD (v295.2)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
I	3.90.320.20	Alpha Beta	Alpha-Beta Complex	Lambda Exonuclease	Chain A	CATH (4.3.0)
F	3.90.320.20	Alpha Beta	Alpha-Beta Complex	Lambda Exonuclease	Chain A	CATH (4.3.0)
C	3.90.320.20	Alpha Beta	Alpha-Beta Complex	Lambda Exonuclease	Chain A	CATH (4.3.0)
H	1.20.840.10	Mainly Alpha	Up-down Bundle	Methyl-coenzyme M Reductase	Chain B, domain 2	CATH (4.3.0)
H	3.30.70.470	Alpha Beta	2-Layer Sandwich	Alpha-Beta Plaits		CATH (4.3.0)
E	1.20.840.10	Mainly Alpha	Up-down Bundle	Methyl-coenzyme M Reductase	Chain B, domain 2	CATH (4.3.0)
E	3.30.70.470	Alpha Beta	2-Layer Sandwich	Alpha-Beta Plaits		CATH (4.3.0)
B	1.20.840.10	Mainly Alpha	Up-down Bundle	Methyl-coenzyme M Reductase	Chain B, domain 2	CATH (4.3.0)
B	3.30.70.470	Alpha Beta	2-Layer Sandwich	Alpha-Beta Plaits		CATH (4.3.0)
G	3.90.390.10	Alpha Beta	Alpha-Beta Complex	Methyl-coenzyme M Reductase	Chain A, domain 1	CATH (4.3.0)
G	3.30.70.470	Alpha Beta	2-Layer Sandwich	Alpha-Beta Plaits		CATH (4.3.0)
G	1.20.840.10	Mainly Alpha	Up-down Bundle	Methyl-coenzyme M Reductase	Chain B, domain 2	CATH (4.3.0)
D	3.90.390.10	Alpha Beta	Alpha-Beta Complex	Methyl-coenzyme M Reductase	Chain A, domain 1	CATH (4.3.0)
D	3.30.70.470	Alpha Beta	2-Layer Sandwich	Alpha-Beta Plaits		CATH (4.3.0)
D	1.20.840.10	Mainly Alpha	Up-down Bundle	Methyl-coenzyme M Reductase	Chain B, domain 2	CATH (4.3.0)
A	3.90.390.10	Alpha Beta	Alpha-Beta Complex	Methyl-coenzyme M Reductase	Chain A, domain 1	CATH (4.3.0)
A	3.30.70.470	Alpha Beta	2-Layer Sandwich	Alpha-Beta Plaits		CATH (4.3.0)
A	1.20.840.10	Mainly Alpha	Up-down Bundle	Methyl-coenzyme M Reductase	Chain B, domain 2	CATH (4.3.0)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C, F, I	Methyl-coenzyme M reductase, gamma subunit	-	-	-
B, E, H	Methyl-coenzyme M reductase, beta subunit	-	-	-
A, D, G	Methyl coenzyme M reductase, alpha subunit	coenzyme-B sulfoethylthiotransferase activity alkylthioltransferase activity transferase activity, transferring sulphur-containing groups transferase activity catalytic activity	cellular respiration energy derivation by oxidation of organic compounds alkane biosynthetic process methane metabolic process generation of precursor metabolites and energy hydrocarbon metabolic process biosynthetic process energy derivation by oxidation of reduced inorganic compounds methanogenesis metabolic process cellular process hydrocarbon biosynthetic process anaerobic respiration	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, D, G	IPR009047	Methyl-coenzyme M reductase, alpha subunit, C-terminal	Domain
A, D, G	IPR008924	Methyl-coenzyme M reductase, alpha/beta subunit, C-terminal	Homologous Superfamily

Protein Modification Annotation

Modified Residue(s)
Chain	Residue(s)	Description
A, D, G	0AF	Parent Component: TRP : AA0520 : 7'-hydroxy-L-tryptophan MOD:01664
A, D, G	GL3	Parent Component: GLY : AA0520 , AA0265 : 7'-hydroxy-L-tryptophan MOD:01664 , 1-thioglycine (internal) MOD:00270 , 1-thioglycine (C-terminal) MOD:01623
A, D, G	MHO	Parent Component: MET : AA0520 , AA0265
A, D, G	MHS	Parent Component: HIS : AA0520 , AA0265 , AA0073 : 7'-hydroxy-L-tryptophan MOD:01664 , 1-thioglycine (internal) MOD:00270 , 1-thioglycine (C-terminal) MOD:01623 , 3'-methyl-L-histidine MOD:00082

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RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.