Annotations: 3SQG

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
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)
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)

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)
G	MCR_alpha	e3sqgG1	A: alpha bundles	X: Methyl-coenzyme M reductase alpha and beta chain-C (From Topology)	H: Methyl-coenzyme M reductase alpha and beta chain-C (From Topology)	T: Methyl-coenzyme M reductase alpha and beta chain-C	F: MCR_alpha	ECOD (1.6)
G	MCR_alpha_N	e3sqgG2	A: a+b two layers	X: Alpha-beta plaits	H: Methyl-coenzyme M reductase subunits (From Topology)	T: Methyl-coenzyme M reductase subunits	F: MCR_alpha_N	ECOD (1.6)
D	MCR_alpha	e3sqgD1	A: alpha bundles	X: Methyl-coenzyme M reductase alpha and beta chain-C (From Topology)	H: Methyl-coenzyme M reductase alpha and beta chain-C (From Topology)	T: Methyl-coenzyme M reductase alpha and beta chain-C	F: MCR_alpha	ECOD (1.6)
D	MCR_alpha_N	e3sqgD2	A: a+b two layers	X: Alpha-beta plaits	H: Methyl-coenzyme M reductase subunits (From Topology)	T: Methyl-coenzyme M reductase subunits	F: MCR_alpha_N	ECOD (1.6)
A	MCR_alpha	e3sqgA2	A: alpha bundles	X: Methyl-coenzyme M reductase alpha and beta chain-C (From Topology)	H: Methyl-coenzyme M reductase alpha and beta chain-C (From Topology)	T: Methyl-coenzyme M reductase alpha and beta chain-C	F: MCR_alpha	ECOD (1.6)
A	MCR_alpha_N	e3sqgA1	A: a+b two layers	X: Alpha-beta plaits	H: Methyl-coenzyme M reductase subunits (From Topology)	T: Methyl-coenzyme M reductase subunits	F: MCR_alpha_N	ECOD (1.6)
H	MCR_beta	e3sqgH1	A: alpha bundles	X: Methyl-coenzyme M reductase alpha and beta chain-C (From Topology)	H: Methyl-coenzyme M reductase alpha and beta chain-C (From Topology)	T: Methyl-coenzyme M reductase alpha and beta chain-C	F: MCR_beta	ECOD (1.6)
H	MCR_beta_N	e3sqgH2	A: a+b two layers	X: Alpha-beta plaits	H: Methyl-coenzyme M reductase subunits (From Topology)	T: Methyl-coenzyme M reductase subunits	F: MCR_beta_N	ECOD (1.6)
E	MCR_beta	e3sqgE1	A: alpha bundles	X: Methyl-coenzyme M reductase alpha and beta chain-C (From Topology)	H: Methyl-coenzyme M reductase alpha and beta chain-C (From Topology)	T: Methyl-coenzyme M reductase alpha and beta chain-C	F: MCR_beta	ECOD (1.6)
E	MCR_beta_N	e3sqgE2	A: a+b two layers	X: Alpha-beta plaits	H: Methyl-coenzyme M reductase subunits (From Topology)	T: Methyl-coenzyme M reductase subunits	F: MCR_beta_N	ECOD (1.6)
B	MCR_beta	e3sqgB1	A: alpha bundles	X: Methyl-coenzyme M reductase alpha and beta chain-C (From Topology)	H: Methyl-coenzyme M reductase alpha and beta chain-C (From Topology)	T: Methyl-coenzyme M reductase alpha and beta chain-C	F: MCR_beta	ECOD (1.6)
B	MCR_beta_N	e3sqgB2	A: a+b two layers	X: Alpha-beta plaits	H: Methyl-coenzyme M reductase subunits (From Topology)	T: Methyl-coenzyme M reductase subunits	F: MCR_beta_N	ECOD (1.6)
I	MCR_gamma	e3sqgI1	A: a+b two layers	X: Alpha-beta plaits	H: Methyl-coenzyme M reductase subunits (From Topology)	T: Methyl-coenzyme M reductase subunits	F: MCR_gamma	ECOD (1.6)
F	MCR_gamma	e3sqgF1	A: a+b two layers	X: Alpha-beta plaits	H: Methyl-coenzyme M reductase subunits (From Topology)	T: Methyl-coenzyme M reductase subunits	F: MCR_gamma	ECOD (1.6)
C	MCR_gamma	e3sqgC1	A: a+b two layers	X: Alpha-beta plaits	H: Methyl-coenzyme M reductase subunits (From Topology)	T: Methyl-coenzyme M reductase subunits	F: MCR_gamma	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
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)
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)
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)

Protein Modification Annotation

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

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.