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Structure of Mycobacterium tuberculosis mtFabD, a malonyl‐CoA:acyl carrier protein transacylase (MCAT)

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Mycobacteria display a unique and unusual cell‐wall architecture, central to which is the membrane‐proximal mycolyl‐arabinogalactan‐peptidoglycan core (mAGP). The biosynthesis of mycolic acids, which form the outermost layer of the mAGP core, involves malonyl‐CoA:acyl carrier protein transacylase (MCAT). This essential enzyme catalyses the transfer of malonyl from coenzyme A to acyl carrier protein AcpM, thus feeding these two‐carbon units into the chain‐elongation cycle of the type II fatty‐acid synthase. The crystal structure of M. tuberculosis mtFabD, the mycobacterial MCAT, has been determined to 3.0 Å resolution by multi‐wavelength anomalous dispersion. Phasing was facilitated by Ni2+ ions bound to the 20‐residue N‐terminal affinity tag, which packed between the two independent copies of mtFabD.
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Keywords: malonyl‐CoA:acyl carrier protein transacylases; mtFabD

Document Type: Research Article

Publication date: October 1, 2007

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