6VYI

Cryo-EM structure of human diacylglycerol O-acyltransferase 1


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure and catalytic mechanism of a human triacylglycerol-synthesis enzyme.

Sui, X.Wang, K.Gluchowski, N.L.Elliott, S.D.Liao, M.Walther, T.C.Farese Jr., R.V.

(2020) Nature 581: 323-328

  • DOI: https://doi.org/10.1038/s41586-020-2289-6
  • Primary Citation of Related Structures:  
    6VYI, 6VZ1

  • PubMed Abstract: 

    Triacylglycerols store metabolic energy in organisms and have industrial uses as foods and fuels. Excessive accumulation of triacylglycerols in humans causes obesity and is associated with metabolic diseases 1 . Triacylglycerol synthesis is catalysed by acyl-CoA diacylglycerol acyltransferase (DGAT) enzymes 2-4 , the structures and catalytic mechanisms of which remain unknown. Here we determined the structure of dimeric human DGAT1, a member of the membrane-bound O-acyltransferase (MBOAT) family, by cryo-electron microscopy at approximately 3.0 Å resolution. DGAT1 forms a homodimer through N-terminal segments and a hydrophobic interface, with putative active sites within the membrane region. A structure obtained with oleoyl-CoA substrate resolved at approximately 3.2 Å shows that the CoA moiety binds DGAT1 on the cytosolic side and the acyl group lies deep within a hydrophobic channel, positioning the acyl-CoA thioester bond near an invariant catalytic histidine residue. The reaction centre is located inside a large cavity, which opens laterally to the membrane bilayer, providing lipid access to the active site. A lipid-like density-possibly representing an acyl-acceptor molecule-is located within the reaction centre, orthogonal to acyl-CoA. Insights provided by the DGAT1 structures, together with mutagenesis and functional studies, provide the basis for a model of the catalysis of triacylglycerol synthesis by DGAT.


  • Organizational Affiliation

    Department of Molecular Metabolism, Harvard T. H. Chan School of Public Health, Boston, MA, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Diacylglycerol O-acyltransferase 1
A, B
488Homo sapiensMutation(s): 0 
Gene Names: DGAT1AGRP1DGAT
EC: 2.3.1.20 (PDB Primary Data), 2.3.1.76 (UniProt)
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for O75907 (Homo sapiens)
Explore O75907 
Go to UniProtKB:  O75907
PHAROS:  O75907
GTEx:  ENSG00000185000 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO75907
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Howard Hughes Medical Institute (HHMI)United States--
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States1R01GM124348
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States5R01GM097194
American Heart AssociationUnited States18POST34030308

Revision History  (Full details and data files)

  • Version 1.0: 2020-05-13
    Type: Initial release
  • Version 1.1: 2020-06-03
    Changes: Database references
  • Version 1.2: 2024-03-06
    Changes: Data collection, Database references