Biosynthetic multitasking facilitates thalassospiramide structural diversity in marine bacteria.

Biosynthetic multitasking facilitates thalassospiramide structural diversity in marine bacteria.
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DOI:
10.1021/ja3119674
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发表时间:
2013-01-23
影响因子:
15
通讯作者:
Moore, Bradley S.
Moore, Bradley S.
中科院分区:
化学1区
文献类型:
--
作者:
Ross, Avena C.;Xu, Ying;Lu, Liang;Kersten, Roland D.;Shao, Zongze;Al-Suwailem, Abdulaziz M.;Dorrestein, Pieter C.;Qian, Pei-Yuan;Moore, Bradley S.

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Thalassospiramides A and B are immunosuppressant cyclic lipopeptides first reported from the marine α-proteobacterium Thalassospira sp. CNJ-328. We describe here the discovery and characterization of an extended family of 14 new analogues from four Tistrella and Thalassospira isolates. These potent calpain 1 protease inhibitors belong to six structure classes in which the length and composition of the acylpeptide side chain varies extensively. Genomic sequence analysis of the thalassospiramide-producing microbes revealed related, genus-specific biosynthetic loci encoding hybrid nonribosomal peptide synthetase/polyketide synthases consistent with thalassospiramide assembly. The bioinformatics analysis of the gene clusters suggests that structural diversity, which ranges from the 803.4 Da thalassospiramide C to the 1291.7 Da thalassospiramide F, results from a complex sequence of reactions involving amino acid substrate channeling and enzymatic multi-module skipping and iteration. Preliminary biochemical analysis of the N-terminal NRPS module from the Thalassospira TtcA megasynthase supports a biosynthetic model in which in cis amino acid activation competes with in trans activation to increase the range of amino acid substrates incorporated at the N-terminus.
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