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Title: Large Conformational Changes of Insertion 3 in Human Glycyl-tRNA Synthetase (hGlyRS) during Catalysis

Journal Article · · Journal of Biological Chemistry
 [1];  [2];  [1];  [1];  [3];  [3];  [4];  [4];  [1];  [1];  [1];  [1]
  1. Sun Yat-Sen Univ., Guangzhou, (China)
  2. Chinese Academy of Sciences (CAS), Guangzhou (China)
  3. Univ. of Science and Technology of China, Hefei (China)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Glycyl-tRNA synthetase (GlyRS) is the enzyme that covalently links glycine to cognate tRNA for translation. It is of great interest because of its nonconserved quaternary structures, unique species-specific aminoacylation properties, and noncanonical functions in neurological diseases, but none of these is fully understood. We report two crystal structures of human GlyRS variants, in the free form and in complex with tRNA Gly respectively, and reveal new aspects of the glycylation mechanism. We discover that insertion 3 differs considerably in conformation in catalysis and that it acts like a "switch" and fully opens to allow tRNA to bind in a cross-subunit fashion. The flexibility of the protein is supported by molecular dynamics simulation, as well as enzymatic activity assays. The biophysical and biochemical studies suggest that human GlyRS may utilize its flexibility for both the traditional function (regulate tRNA binding) and alternative functions (roles in diseases).

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1379154
Journal Information:
Journal of Biological Chemistry, Vol. 291, Issue 11; ISSN 0021-9258
Publisher:
American Society for Biochemistry and Molecular BiologyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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Cited By (7)

Drugging tRNA aminoacylation text January 2018
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Aminoacyl-tRNA synthetase evolution and sectoring of the genetic code text January 2018
Drugging tRNA aminoacylation journal November 2017
Aminoacyl-tRNA synthetase evolution and sectoring of the genetic code text January 2018
Drugging tRNA aminoacylation text January 2018
Aminoacyl-tRNA synthetase evolution and sectoring of the genetic code journal May 2018

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