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    Characterization of the putative operon containing arylamine n-acetyltransferase (nat) in mycobacterium bovis BCG

    Anderton, M.C. and Bhakta, Sanjib and Besra, G.S. and Jeavons, P. and Eltis, L.D. and Sim, E. (2006) Characterization of the putative operon containing arylamine n-acetyltransferase (nat) in mycobacterium bovis BCG. Molecular Microbiology 59 (1), pp. 181-192. ISSN 0950-382X.

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    Mycobacterium bovis BCG and Mycobacterium tuberculosis possess a single arylamine N‐acetyltransferase whose gene is predicted to occur within a six‐gene operon. Deletion of the nat gene caused an extended lag phase in M. bovis BCG and a cell morphology associated with an altered pattern of cell wall mycolates. Analysis of cDNA from M. bovis BCG shows that during in vitro growth all the genes in the putative nat operon are expressed and the open reading frames are contiguous, supporting the existence of an operon. Two genes in the operon, Mb3599c and Mb3600c, are predicted to encode homologues of enzymes annotated as a 2,3‐dihydroxybiphenyl 1,2‐dioxygenase (bphC5) and a 2‐hydroxy‐6‐oxo‐6‐phenylhexa‐2,4‐dienoate hydrolase (bphD2), respectively, in Rhodococcus RHA1. As predicted, M. bovis BCG cell lysates metabolized the BphC substrate 2,3‐dihydroxybiphenyl (2,3‐DHB) to 2‐hydroxy‐6‐oxo‐6‐phenylhexa‐2,4‐dienoic acid (HOPDA), a BphD substrate, which was subsequently hydrolysed. Immunoprecipitation of the BphD homologue from these lysates led to an accumulation of HOPDA. M. bovis BCG growth on both solid and liquid media was inhibited with either 2,3‐DHB or an inhibitor of BphC, 3‐chlorocatechol (3‐CC). In addition, incubation with 2,3‐DHB affects the lipid composition of the cell wall resulting in a diminished level of mycolates and an altered cell morphology similar to the Δnat strain. We propose the enzymes encoded by the putative operon have a similar endogenous role to that of the NAT enzyme and are part of a pathway important for cell wall synthesis.


    Item Type: Article
    School: Birkbeck Faculties and Schools > Faculty of Science > School of Natural Sciences
    Depositing User: Sarah Hall
    Date Deposited: 30 Apr 2019 09:45
    Last Modified: 02 Aug 2023 17:51


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