Kaundinya CR, Savithri HS, Rao KK, Balaji PV. EpsM from Bacillus subtilis 168 has UDP-2,4,6-trideoxy-2-acetamido-4-amino glucose acetyltransferase activity in vitro.
Biochem Biophys Res Commun 2018;
505:1057-1062. [PMID:
30314705 DOI:
10.1016/j.bbrc.2018.09.185]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2018] [Accepted: 09/29/2018] [Indexed: 01/14/2023]
Abstract
Bacillus subtilis 168 EpsM (UniProt id P71063) has been electronically annotated as putative acetyltransferase in the UniProt database. The gene epsM was cloned and overexpressed in E. coli with an N-terminal GST tag. The purified fusion protein was shown by absorption spectroscopy, autoradiography and reverse phase HPLC to catalyse the conversion of UDP-2,4,6-trideoxy-2-acetamido-4-amino glucose to UDP-2,4,6-trideoxy-2,4-diacetamido glucose, commonly known as N,N'-diacetylbacillosamine, using acetyl coenzyme A as the donor substrate. His146 was shown by site-directed mutagenesis to be essential for acetyltransferase activity. It is hypothesized that EpsC (NAD+ dependent UDP GlcNAc 4,6-dehydratase), EpsN (PLP dependent aminotransferase) and EpsM, all of which are part of the eps operon, are involved in the biosynthesis of N,N'-diacetylbacillosamine.
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