Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2B SuperfamilyFlavoreductase-like 8057739 3000055 SCOP2B (2022-06-29)
BSCOP2B SuperfamilyFlavoreductase-like 8057739 3000055 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
AsolAe2gb0A1 A: a+b two layersX: FAD-linked reductases, C-terminal domain-likeH: FAD-linked reductases-C (From Topology)T: FAD-linked reductases-CF: solAECOD (1.6)
ADAO_1ste2gb0A2 A: a/b three-layered sandwichesX: Rossmann-likeH: Rossmann-relatedT: FAD/NAD(P)-binding domainF: DAO_1stECOD (1.6)
BsolAe2gb0B1 A: a+b two layersX: FAD-linked reductases, C-terminal domain-likeH: FAD-linked reductases-C (From Topology)T: FAD-linked reductases-CF: solAECOD (1.6)
BDAO_1ste2gb0B2 A: a/b three-layered sandwichesX: Rossmann-likeH: Rossmann-relatedT: FAD/NAD(P)-binding domainF: DAO_1stECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
A, B
PF01266FAD dependent oxidoreductase (DAO)FAD dependent oxidoreductaseThis family includes various FAD dependent oxidoreductases: Glycerol-3-phosphate dehydrogenase EC:1.1.99.5, Sarcosine oxidase beta subunit EC:1.5.3.1, D-alanine oxidase EC:1.4.99.1, D-aspartate oxidase EC:1.4.3.1.Domain

Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage

ChainsEnzyme NameDescriptionCatalytic Residues
sarcosine oxidase  M-CSA #113

Monomeric sarcosine oxidase (MSOX) catalyses the oxidative demethylation of sarcosine (N-methylglycine) to form glycine and formaldehyde. Sarcosine is a common soil metabolite that can act as the sole source of carbon and energy for many microorganisms capable of expressing sarcosine oxidase.

MSOX is part of a family of enzymes which contain flavin (FAD covalently attached to the protein via Cys315) and catalyse the oxidation of various secondary and tertiary amino acids.

Despite the vast amount of research that has been done on these enzymes, the exact mechanism remains elusive. There are three proposals: polar, hydride and single electron transfer. To date, there is little evidence to suggest one over the other.

The mechanism by which Cys315 becomes attached to FAD involves His45 and Arg49 [PMID:10368302] and is thought to be autocatalytic. The formation of the covalent FAD adduct is not shown in this entry.

Defined by 7 residues: HIS:B-45THR:B-48ARG:B-49LYS:B-265HIS:B-269CYS:B-315LYS:B-348
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