Chemoenzymatic synthesis of thiazolyl peptide natural products featuring an enzyme-catalyzed formal [4 + 2] cycloaddition.

Chemoenzymatic synthesis of thiazolyl peptide natural products featuring an enzyme-catalyzed formal [4 + 2] cycloaddition.
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DOI:
10.1021/jacs.5b00940
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发表时间:
2015-03-18
影响因子:
15
通讯作者:
Bowers AA
Bowers AA
中科院分区:
化学1区
文献类型:
--
作者:
Wever WJ;Bogart JW;Baccile JA;Chan AN;Schroeder FC;Bowers AA

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来自蜡状芽孢杆菌ATCC 14579的硫代青霉素是众所周知的噻唑基肽类天然产物抗生素的成员,其生物合成最近已显示通过核糖体编码的前体肽的翻译后修饰进行。长期以来,人们一直假设噻唑基肽生物合成的最后一步涉及两个脱氢丙氨酸之间的正式[4 + 2]环加成,这是一种独特的转化,无法进行酶促表征。在这里,我们表明,TclM,一个单一的酶从thiocillin生物合成途径,催化这种转变。为了便于表征这类新的酶,我们已经开发了一种结合化学和生物学途径的复杂肽底物,依赖于化学合成的修饰的C-末端片段和耦合到一个38个残基的前导肽通过天然化学连接(NCL)。这种策略,结合活性酶,提供了一个新的化学酶的路线,这类有前途的抗生素。
Thiocillins from Bacillus cereus ATCC 14579 are members of the well-known thiazolyl peptide class of natural product antibiotics, the biosynthesis of which has recently been shown to proceed via posttranslational modification of ribosomally encoded precursor peptides. It has long been hypothesized that the final step of thiazolyl peptide biosynthesis involves a formal [4 + 2] cycloaddition between two dehydroalanines, a unique transformation that had eluded enzymatic characterization. Here we demonstrate that TclM, a single enzyme from the thiocillin biosynthetic pathway, catalyzes this transformation. To facilitate characterization of this new class of enzyme, we have developed a combined chemical and biological route to the complex peptide substrate, relying on chemical synthesis of a modified C-terminal fragment and coupling to a 38-residue leader peptide by means of native chemical ligation (NCL). This strategy, combined with active enzyme, provides a new chemoenzymatic route to this promising class of antibiotics.
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