1,3-Beta-glucan synthase

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1,3-Beta-glucan synthase
EC number2.4.1.34
CAS number9037-30-3
IntEnzIntEnz view
ExPASyNiceZyme view
MetaCycmetabolic pathway
PDB structuresRCSB PDB PDBe PDBsum
Pfam clanCL0111

1,3-Beta-glucan synthase is a glucosyltransferase enzyme involved in the generation of beta-glucan in fungi. It serves as a pharmacological target for antifungal drugs such as caspofungin, anidulafungin, and micafungin, deemed 1,3-Beta-glucan synthase inhibitors.

The biosynthesis of disaccharides, oligosaccharides, and polysaccharides involves the action of hundreds of different glycosyltransferases. These enzymes catalyse the transfer of sugar moieties from activated donor molecules to specific acceptor molecules, forming glycosidic bonds. A classification of glycosyltransferases using nucleotide diphospho-sugar, nucleotide monophospho-sugar and sugar phosphates (EC 2.4.1.-.), and related proteins into distinct sequence-based families has been described.[1] This classification is available on the CAZy (CArbohydrate-Active EnZymes) web site . The same three-dimensional fold is expected to occur within each of the families. Because 3-D structures are better conserved than sequences, several of the families defined on the basis of sequence similarities may have similar 3-D structures and, therefore, form 'clans'.

This is the glycosyltransferase 48 family, which consists of various 1,3-beta-glucan synthase components including Gls1, Gls2, and Gls3 from yeast. 1,3-Beta-glucan synthase (EC also known as callose synthase catalyses the formation of a beta-1,3-glucan polymer that is a major component of the fungal cell wall.[2] The reaction catalysed is:-

UDP-glucose + {(1,3)-beta-D-glucosyl}(N) = UDP + {(1,3)-beta-D-glucosyl}(N+1).

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  1. ^ Campbell JA, Davies GJ, Bulone V, Henrissat B (September 1997). "A classification of nucleotide-diphospho-sugar glycosyltransferases based on amino acid sequence similarities". Biochem. J. 326 (3): 929–39. doi:10.1042/bj3260929u. PMC 1218753. PMID 9334165.
  2. ^ Mio T, Adachi-Shimizu M, Tachibana Y, Tabuchi H, Inoue SB, Yabe T, Yamada-Okabe T, Arisawa M, Watanabe T, Yamada-Okabe H (July 1997). "Cloning of the Candida albicans homolog of Saccharomyces cerevisiae GSC1/FKS1 and its involvement in beta-1,3-glucan synthesis". J. Bacteriol. 179 (13): 4096–105. PMC 179227. PMID 9209021.
This article incorporates text from the public domain Pfam and InterPro: IPR003440