Protein Family Models

SIS (Sugar ISomerase) domains are found in many phosphosugar isomerases and phosphosugar binding proteins. SIS domains are also found in proteins that regulate the expression of genes involved in synthesis of phosphosugars. Presumably the SIS domains bind to the end-product of the pathway. Structure of SIS domain. [1]. 9739095. Involvement of the C terminus in intramolecular nitrogen channeling in glucosamine 6-phosphate synthase: evidence from a 1.6 A crystal structure of the isomerase domain. Teplyakov A, Obmolova G, Badet-Denisot MA, Badet B, Polikarpov I;. Structure 1998;6:1047-1055. [2]. 10203754. The SIS domain: a phosphosugar-binding domain. Bateman A;. Trends Biochem Sci 1999;24:94-95. (from Pfam)

Date:

2024-10-16

CBS domains are small intracellular modules that pair together to form a stable globular domain [2]. This family represents a single CBS domain. Pairs of these domains have been termed a Bateman domain [6]. CBS domains have been shown to bind ligands with an adenosyl group such as AMP, ATP and S-AdoMet [5]. CBS domains are found attached to a wide range of other protein domains suggesting that CBS domains may play a regulatory role making proteins sensitive to adenosyl carrying ligands. The region containing the CBS domains in Cystathionine-beta synthase is involved in regulation by S-AdoMet [4]. CBS domain pairs from AMPK bind AMP or ATP [5]. The CBS domains from IMPDH and the chloride channel CLC2 bind ATP [5]. Discovery and naming of the CBS domain. [1]. 9020585. The structure of a domain common to archaebacteria and the homocystinuria disease protein. Bateman A;. Trends Biochem Sci 1997;22:12-13. 3D Structure found as a sub-domain in TIM barrel of inosine-monophosphate dehydrogenase. [2]. 10200156. Characteristics and crystal structure of bacterial inosine-5'-monophosphate dehydrogenase. Zhang R, Evans G, Rotella FJ, Westbrook EM, Beno D, Huberman E, Joachimiak A, Collart FR;. Biochemistry 1999;38:4691-4700. Discovery of CBS domain. [3]. 9106071. CBS domains in ClC chloride channels implicated in myotonia and nephrolithiasis (kidney stones). Ponting CP;. J Mol Med 1997;75:160-163. [4]. 11524006. Regulation of human cystathionine beta-synthase by S-adenosyl-L-methionine: evidence for two catalytically active conformations involving an autoinhibitory domain in the C-terminal region. Janosik M, Kery V, Gaustadnes M, Macl. TRUNCATED at 1650 bytes (from Pfam)

Date:

2024-10-16

This HMM describes a number of closely related proteins with the phosphosugar-binding domain SIS (Sugar ISomerase) followed by two copies of the CBS (named after Cystathionine Beta Synthase) domain. One is GutQ, a protein of the glucitol operon. Another is KpsF, a virulence factor involved in capsular polysialic acid biosynthesis in some pathogenic strains of E. coli.

Date:

2021-04-27