Mapping the catalytic conformations of an assembly-line polyketide synthase module.

Mapping the catalytic conformations of an assembly-line polyketide synthase module.
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DOI:
10.1126/science.abi8358
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发表时间:
2021-11-05
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Khosla C
Khosla C
中科院分区:
其他
文献类型:
--
作者:
Cogan DP;Zhang K;Li X;Li S;Pintilie GD;Roh SH;Craik CS;Chiu W;Khosla C

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Assembly-line polyketide synthases, such as the 6-deoxyerythronolide B synthase (DEBS), are large enzyme factories prized for their ability to produce specific and complex polyketide products. By channeling protein-tethered substrates across multiple active sites in a defined linear sequence, these enzymes facilitate programmed small-molecule syntheses that could theoretically be harnessed to access countless polyketide product structures. Using cryogenic electron microscopy to study DEBS module 1, we present a structural model describing this substrate-channeling phenomenon. Our 3.2- to 4.3-angstrom-resolution structures of the intact module reveal key domain-domain interfaces and highlight an unexpected module asymmetry. We also present the structure of a product-bound module that shines light on a recently described “turnstile” mechanism for transient gating of active sites along the assembly line.
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