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Title: LRAT-specific domain facilitates vitamin A metabolism by domain swapping in HRASLS3

Journal Article · · Nature Chemical Biology
 [1];  [1];  [1];  [1]
  1. Case Western Reserve Univ., Cleveland, OH (United States). School of Medicine. Cleveland Center for Membrane and Structural Biology. Dept. of Pharmacology

Cellular uptake of vitamin A, production of visual chromophore and triglyceride homeostasis in adipocytes depend on two representatives of the vertebrate N1pC/P60 protein family, lecithin:retinol acyltransferase (LRAT) and HRAS-like tumor suppressor 3 (HRASLS3). Both proteins function as lipid-metabolizing enzymes but differ in their substrate preferences and dominant catalytic activity. The mechanism of this catalytic diversity is not understood. In this paper, by using a gain-of-function approach, we identified a specific sequence responsible for the substrate specificity of N1pC/P60 proteins. A 2.2-Å crystal structure of the HRASLS3-LRAT chimeric enzyme in a thioester catalytic intermediate state revealed a major structural rearrangement accompanied by three-dimensional domain swapping dimerization not observed in native HRASLS proteins. Structural changes affecting the active site environment contributed to slower hydrolysis of the catalytic intermediate, supporting efficient acyl transfer. Finally, these findings reveal structural adaptation that facilitates selective catalysis and mechanism responsible for diverse substrate specificity within the LRAT-like enzyme family.

Research Organization:
Case Western Reserve Univ., Cleveland, OH (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); USDOE Office of Science (SC), Basic Energy Sciences (BES); National Inst. of Health (NIH) (United States)
Grant/Contract Number:
AC02-06CH11357; EY023948; EY009339; T32 GM007250; P41RR012408; P41GM103473
OSTI ID:
1168504
Journal Information:
Nature Chemical Biology, Vol. 11, Issue 1; ISSN 1552-4450
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 38 works
Citation information provided by
Web of Science

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Cited By (6)

Structural biology of 11-cis-retinaldehyde production in the classical visual cycle journal October 2018
Lecithin:Retinol Acyl Transferase (LRAT) induces the formation of lipid droplets journal August 2019
Recent insights on the role and regulation of retinoic acid signaling during epicardial development journal May 2019
Molecular Basis for Vitamin A Uptake and Storage in Vertebrates journal October 2016
Structural and Functional Analyses of Human ChaC2 in Glutathione Metabolism journal December 2019
Activity-Based Protein Profiling Identifies α-Ketoamides as Inhibitors for Phospholipase A2 Group XVI journal January 2019