Protein Family Models

This HMM represents the combined B and C domains of the PTS transport system enzyme II specific for glucose transport [1]. Many of the genes in this family also include an A domain as part of the same polypeptide and thus should be given the name "PTS system, glucose-specific IIABC component" while the B. subtilus enzyme also contains an enzyme III domain which appears to act independently of the enzyme II domains [2]. This family is most closely related to the N-acetylglucosamine-specific PTS enzymes (TIGR01998).

Gene:

ptsG

Date:

2024-10-21

PTS transporter subunit IIABC contains the combined A, B, and C domains of the PTS transport system enzyme II, may be specific for the transport of glucose, sucrose, or alpha/beta-glucosides

Date:

2020-07-27

These are part of the The PTS Glucose-Glucoside (Glc) SuperFamily. The Glc family includes permeases specific for glucose, N-acetylglucosamine and a large variety of a- and b-glucosides. However, not all b-glucoside PTS permeases are in this class, as the cellobiose (Cel) b-glucoside PTS permease is in the Lac family (TC #4.A.3). The IIA, IIB and IIC domains of all of the permeases listed below are demonstrably homologous. These permeases show limited sequence similarity with members of the Fru family (TC #4.A.2). Several of the PTS permeases in the Glc family lack their own IIA domains and instead use the glucose IIA protein (IIAglc or Crr). Most of these permeases have the B and C domains linked together in a single polypeptide chain, and a cysteyl residue in the IIB domain is phosphorylated by direct phosphoryl transfer from IIAglc(his~P). Those permeases which lack a IIA domain include the maltose (Mal), arbutin-salicin-cellobiose (ASC), trehalose (Tre), putative glucoside (Glv) and sucrose (Scr) permeases of E. coli . Most, but not all Scr permeases of other bacteria also lack a IIA domain. The three-dimensional structures of the IIA and IIB domains of the E. coli glucose permease have been elucidated. IIAglchas a complex b-sandwich structure while IIBglc is a split ab-sandwich with a topology unrelated to the split ab-sandwich structure of HPr.

Date:

2021-08-24

The PTS Glucose-Glucoside (Glc) Family (TC 4.A.1) Bacterial PTS transporters transport and concomitantly phosphorylate their sugar substrates, and typically consist of multiple subunits or protein domains. The Glc family includes permeases specific for glucose, N-acetylglucosamine and a large variety of a- and b-glucosides. However, not all b-glucoside PTS permeases are in this class, as the cellobiose (Cel) b-glucoside PTS permease is in the Lac family (TC #4.A.3). These permeases show limited sequence similarity with members of the Fru family (TC #4.A.2). Several of the E. coli PTS permeases in the Glc family lack their own IIA domains and instead use the glucose IIA protein (IIAglc or Crr). Most of these permeases have the B and C domains linked together in a single polypeptide chain, and a cysteyl residue in the IIB domain is phosphorylated by direct phosphoryl transfer from IIAglc(his~P). Those permeases which lack a IIA domain include the maltose (Mal), arbutin-salicin-cellobiose (ASC), trehalose (Tre), putative glucoside (Glv) and sucrose (Scr) permeases of E. coli . Most, but not all Scr permeases of other bacteria also lack a IIA domain. This HMM is specific for the IIB domain of the Glc family PTS transporters.

Date:

2021-11-04