EC 2.4.1.381     
Accepted name: dTDP-Rha:α-D-Man-(1→3)-α-D-Gal diphosphoundecaprenol α-1,2-rhamnosyltransferase
Reaction: dTDP-β-L-rhamnose + α-D-Man-(1→2)-α-D-Man-(1→3)-α-D-Gal-PP-Und = dTDP + α-L-Rha-(1→2)-α-D-Man-(1→2)-α-D-Man-(1→3)-α-D-Gal-PP-Und
Glossary: α-D-Man-(1→2)-α-D-Man-(1→3)-α-D-Gal-PP-Und = α-D-mannopyranosyl-(1→2)-α-D-mannopyranosyl-(1→3)-α-D-galactopyranosyl-diphospho-ditrans,octacis-undecaprenol
α-L-Rha-(1→2)-α-D-Man-(1→2)-α-D-Man-(1→3)-α-D-Gal-PP-Und = α-L-rhamnopyranosyl-(1→2)-α-D-mannopyranosyl-(1→2)-α-D-mannopyranosyl-(1→3)-α-D-galactopyranosyl-diphospho-ditrans,octacis-undecaprenol
Other name(s): wbaQ (gene name); rfbQ (gene name)
Systematic name: dTDP-β-L-rhamnose:α-D-mannopyranosyl-(1→2)-α-D-mannopyranosyl-(1→3)-α-D-galactopyranosyl-diphospho-ditrans,octacis-undecaprenol 2III-α-rhamnosyltransferase (configuration-inverting)
Comments: The enzyme, present in Salmonella strains that belong to group C2, participates in the biosynthesis of the repeat unit of O antigens produced by these strains.
References:
1.  Brown, P.K., Romana, L.K. and Reeves, P.R. Cloning of the rfb gene cluster of a group C2 Salmonella strain: comparison with the rfb regions of groups B and D. Mol. Microbiol. 5 (1991) 1873–1881. [PMID: 1722557]
2.  Brown, P.K., Romana, L.K. and Reeves, P.R. Molecular analysis of the rfb gene cluster of Salmonella serovar muenchen (strain M67): the genetic basis of the polymorphism between groups C2 and B. Mol. Microbiol. 6 (1992) 1385–1394. [PMID: 1379320]
3.  Liu, D., Haase, A.M., Lindqvist, L., Lindberg, A.A. and Reeves, P.R. Glycosyl transferases of O-antigen biosynthesis in Salmonella enterica: identification and characterization of transferase genes of groups B, C2, and E1. J. Bacteriol. 175 (1993) 3408–3413. [PMID: 7684736]
4.  Zhao, X., Dai, Q., Jia, R., Zhu, D., Liu, M., Wang, M., Chen, S., Sun, K., Yang, Q., Wu, Y. and Cheng, A. two novel Salmonella bivalent vaccines confer dual protection against two Salmonella serovars in mice. Front Cell Infect Microbiol 7:391 (2017). [PMID: 28929089]
[EC 2.4.1.381 created 2021]