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Natural separation of the acyl-CoA ligase reaction results in a non-adenylating enzyme

Journal Article · · Nature Chemical Biology
 [1];  [1];  [1];  [2];  [2];  [2];  [1];  [2];  [2];  [3];  [4]
  1. Scripps Research Inst., Jupiter, FL (United States). Dept. of Chemistry
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Midwest Center for Structural Genomics and Structural Biology Center, Biosciences Division
  3. Rice Univ., Houston, TX (United States). Dept. of Biosciences
  4. Scripps Research Inst., Jupiter, FL (United States). Dept. of Chemistry; Scripps Research Inst., Jupiter, FL (United States). Dept of Molecular Medicine; Scripps Research Inst., Jupiter, FL (United States). Natural Products Library Initiative at The Scripps Research Inst.
Acyl-coenzyme A (CoA) ligases catalyze the activation of carboxylic acids via a two-step reaction of adenylation followed by thioesterification. Here, we report the discovery of a non-adenylating acyl-CoA ligase PtmA2 and the functional separation of an acyl-CoA ligase reaction. Both PtmA1 and PtmA2, two acyl-CoA ligases from the biosynthetic pathway of platensimycin and platencin, are necessary for the two steps of CoA activation. Gene inactivation of ptmA1 and ptmA2 resulted in the accumulation of free acid and adenylate intermediates, respectively. Enzymatic and structural characterization of PtmA2 confirmed its ability to only catalyze thioesterification. Structural characterization of PtmA2 revealed it binds both free acid and adenylate substrates and undergoes the established mechanism of domain alternation. Finally, site-directed mutagenesis restored both the adenylation and complete CoA activation reactions. This study challenges the currently accepted paradigm of adenylating enzymes and inspires future investigations on functionally separated acyl-CoA ligases and their ramifications in biology.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
Arnold and Mabel Beckman Foundation; Chinese Academy of Sciences (CAS); National Institutes of Health (NIH); USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1466308
Journal Information:
Nature Chemical Biology, Journal Name: Nature Chemical Biology Journal Issue: 7 Vol. 14; ISSN 1552-4450
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Targeting adenylate-forming enzymes with designed sulfonyladenosine inhibitors journal April 2019
Bakterielle Diterpenbiosynthese journal August 2019
Bacterial Diterpene Biosynthesis journal November 2019
Global analysis of adenylate-forming enzymes reveals β-lactone biosynthesis pathway in pathogenic Nocardia journal October 2020

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