4Q95

Crystal structure of HRASLS3/LRAT chimeric protein


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.207 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

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

Golczak, M.Sears, A.E.Kiser, P.D.Palczewski, K.

(2015) Nat.Chem.Biol. 11: 26-32

  • DOI: 10.1038/nchembio.1687

  • PubMed Abstract: 
  • 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 ...

    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. Here, 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. These findings reveal structural adaptation that facilitates selective catalysis and mechanism responsible for diverse substrate specificity within the LRAT-like enzyme family.


    Organizational Affiliation

    Department of Pharmacology, Cleveland Center for Membrane and Structural Biology, School of Medicine, Case Western Reserve University, Cleveland, Ohio, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HRAS-like suppressor 3, Lecithin retinol acyltransferase
A, B
149Homo sapiensMus musculus
This entity is chimeric
Mutation(s): 0 
Gene Names: PLAAT3 (HRASLS3, HREV107, PLA2G16), Lrat
EC: 2.3.1.-, 3.1.1.32, 3.1.1.4 2.3.1.135
Find proteins for P53816 (Homo sapiens)
Go to UniProtKB:  P53816
Find proteins for Q9JI60 (Mus musculus)
Go to UniProtKB:  Q9JI60
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SHV
Query on SHV

Download SDF File 
Download CCD File 
A, B
HEPTANOIC ACID
C7 H14 O2
MNWFXJYAOYHMED-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.207 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 63.123α = 90.00
b = 63.123β = 90.00
c = 157.965γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
PHASERphasing
REFMACrefinement
XDSdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-10-29
    Type: Initial release
  • Version 1.1: 2015-02-25
    Type: Database references
  • Version 1.2: 2017-08-16
    Type: Refinement description, Source and taxonomy