Cyclic AMP regulation of protein lysine acetylation in Mycobacterium tuberculosis.

Cyclic AMP regulation of protein lysine acetylation in Mycobacterium tuberculosis.
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DOI:
10.1038/nsmb.2318
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发表时间:
2012-08
影响因子:
16.8
通讯作者:
Alber, Tom
Alber, Tom
中科院分区:
生物学1区
文献类型:
--
作者:
Lee, Ho Jun;Lang, P. Therese;Fortune, Sarah M.;Sassetti, Christopher M.;Alber, Tom

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Protein lysine acetylation networks can regulate central processes such as carbon metabolism and gene expression in bacteria. In Escherichia coli, cyclic-AMP (cAMP) regulates protein lysine acetyltransferase (PAT) activity at the transcriptional level, but in Mycobacterium tuberculosis, fusion of a cyclic-nucleotide binding domain to a Gcn5-like PAT domain enables direct cAMP control of protein acetylation. Here we describe the allosteric activation mechanism of M. tuberculosis PAT. The crystal structures of the auto-inhibited and cAMP-activated PAT reveal that cAMP binds to a cryptic site in the regulatory domain over 32 Å from the catalytic site. An extensive conformational rearrangement relieves auto-inhibition by a substrate-mimicking lid that covers the protein-substrate binding surface. A steric double latch couples the domains by harnessing a classic, cAMP-mediated, conformational switch. The structures suggest general features that enable the evolution of long-range communication between linked domains.
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