Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2B SuperfamilyEnzyme IIa from lactose specific PTS, IIa-lac 8034980 3001316 SCOP2B (2022-06-29)
BSCOP2B SuperfamilyEnzyme IIa from lactose specific PTS, IIa-lac 8034980 3001316 SCOP2B (2022-06-29)
CSCOP2B SuperfamilyEnzyme IIa from lactose specific PTS, IIa-lac 8034980 3001316 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
APTS_IIAe1e2aA1 A: alpha bundlesX: Spectrin repeat-likeH: Enzyme IIa from lactose specific PTS, IIa-lac (From Topology)T: Enzyme IIa from lactose specific PTS, IIa-lacF: PTS_IIAECOD (1.6)
BPTS_IIAe1e2aB1 A: alpha bundlesX: Spectrin repeat-likeH: Enzyme IIa from lactose specific PTS, IIa-lac (From Topology)T: Enzyme IIa from lactose specific PTS, IIa-lacF: PTS_IIAECOD (1.6)
CPTS_IIAe1e2aC1 A: alpha bundlesX: Spectrin repeat-likeH: Enzyme IIa from lactose specific PTS, IIa-lac (From Topology)T: Enzyme IIa from lactose specific PTS, IIa-lacF: PTS_IIAECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
A, B, C
PF02255PTS system, Lactose/Cellobiose specific IIA subunit (PTS_IIA)PTS system, Lactose/Cellobiose specific IIA subunitThe bacterial phosphoenolpyruvate: sugar phosphotransferase system (PTS) is a multi-protein system involved in the regulation of a variety of metabolic and transcriptional processes. The lactose/cellobiose-specific family are one of four structural ...The bacterial phosphoenolpyruvate: sugar phosphotransferase system (PTS) is a multi-protein system involved in the regulation of a variety of metabolic and transcriptional processes. The lactose/cellobiose-specific family are one of four structurally and functionally distinct group IIA PTS system enzymes. This family of proteins normally function as a homotrimer, stabilised by a centrally located metal ion [1]. Separation into subunits is thought to occur after phosphorylation.
Domain

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

ChainsEnzyme NameDescriptionCatalytic Residues
protein-Npi-phosphohistidine---sugar phosphotransferase (type III)  M-CSA #514

Enzyme II lactose belongs to a class of lactose/cellubiose-specific family of enzymes II which act as sugar specific permeases. The enzyme is involved in the phosphotransferase system (PTS), a mechanism responsible for the specific binding, transmembrane transport and phosphorylation of a carbohydrate substrate. The PTS is a major carbohydrate transport system in bacteria and catalyses the phosphorylation of incoming sugar substrates, coupled with translocation across the cell membrane. The function of PTS enzymes makes this system a link between the uptake and metabolism of sugars.

The complete PTS acts as follows: a phosphoryl group from phosphoenolpyruvate (PEP) is transferred via a signal transduction pathway, to enzyme I (EI) which in turn transfers it to a phosphoryl carrier, the histidine protein (HPr). Phospho-HPr (the substrate for this entry) then transfers the phosphoryl group to a sugar-specific permease, a membrane-bound complex known as enzyme 2 (EII), which transports the sugar to the cell. EII consists of at least three structurally distinct domains IIA, IIB and IIC [PMID:1537788]. These can either be fused together in a single polypeptide chain or exist as two or three interactive chains, formerly called enzymes II (EII) and III (EIII).

Defined by 3 residues: HIS:A-78GLN:A-80HIS:A-82
 | 
 
Explore in 3DM-CSA Motif Definition