8ERC | pdb_00008erc

Human Membrane-bound O-acyltransferase 7

• PDB DOI: https://doi.org/10.2210/pdb8ERC/pdb
• EM Map EMD-28552: EMDB EMDataResource

• Classification: MEMBRANE PROTEIN
• Organism(s): Homo sapiens
• Expression System: Homo sapiens
• Mutation(s): No 
• Membrane Protein: Yes  PDBTMmpstruc


• Deposited: 2022-10-11 Released: 2023-09-27 
• Deposition Author(s): Wang, K., Liao, M., Farese, R.V., Walther, T.C.
• Funding Organization(s): National Institutes of Health/National Center for Research Resources (NIH/NCRR), Howard Hughes Medical Institute (HHMI)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.70 Å
• Aggregation State: 2D ARRAY 
• Reconstruction Method: SINGLE PARTICLE 

Literature

The structure of phosphatidylinositol remodeling MBOAT7 reveals its catalytic mechanism and enables inhibitor identification.

Wang, K., Lee, C.W., Sui, X., Kim, S., Wang, S., Higgs, A.B., Baublis, A.J., Voth, G.A., Liao, M., Walther, T.C., Farese Jr., R.V.

(2023) Nat Commun 14: 3533-3533

• PubMed: 37316513 
• DOI: https://doi.org/10.1038/s41467-023-38932-5
• Primary Citation Related Structures: 
  8ERC


• PubMed Abstract: 
  

  Cells remodel glycerophospholipid acyl chains via the Lands cycle to adjust membrane properties. Membrane-bound O-acyltransferase (MBOAT) 7 acylates lyso-phosphatidylinositol (lyso-PI) with arachidonyl-CoA. MBOAT7 mutations cause brain developmental disorders, and reduced expression is linked to fatty liver disease. In contrast, increased MBOAT7 expression is linked to hepatocellular and renal cancers. The mechanistic basis of MBOAT7 catalysis and substrate selectivity are unknown. Here, we report the structure and a model for the catalytic mechanism of human MBOAT7. Arachidonyl-CoA and lyso-PI access the catalytic center through a twisted tunnel from the cytosol and lumenal sides, respectively. N-terminal residues on the ER lumenal side determine phospholipid headgroup selectivity: swapping them between MBOATs 1, 5, and 7 converts enzyme specificity for different lyso-phospholipids. Finally, the MBOAT7 structure and virtual screening enabled identification of small-molecule inhibitors that may serve as lead compounds for pharmacologic development.

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Organizational Affiliation: 
• Department of Molecular Metabolism, Harvard T.H. Chan School of Public Health, Boston, MA, USA.
Department of Cell Biology, Harvard Medical School, Boston, MA, USA.
Department of Biochemistry and Biophysics, College of Agriculture and Life Sciences, Texas A&M University, College Station, TX, USA.
Pritzker School of Molecular Engineering, University of Chicago, Chicago, IL, USA.
Harvard T.H. Chan Advanced Multi-Omics Platform, Harvard T.H. Chan School of Public Health, Boston, MA, USA.
Department of Chemistry, Chicago Center for Theoretical Chemistry, James Franck Institute, and Institute for Biophysical Dynamics, The University of Chicago, Chicago, IL, USA.
Department of Cell Biology, Harvard Medical School, Boston, MA, USA. [e-mail].
School of Life Sciences, Southern University of Science and Technology, Shenzhen, China. [e-mail].
Department of Molecular Metabolism, Harvard T.H. Chan School of Public Health, Boston, MA, USA. [e-mail].
Department of Cell Biology, Harvard Medical School, Boston, MA, USA. [e-mail].
Harvard T.H. Chan Advanced Multi-Omics Platform, Harvard T.H. Chan School of Public Health, Boston, MA, USA. [e-mail].
Broad Institute of MIT and Harvard, Cambridge, MA, USA. [e-mail].
Howard Hughes Medical Institute, Boston, MA, USA. [e-mail].
Cell Biology Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York, NY, USA. [e-mail].
Department of Molecular Metabolism, Harvard T.H. Chan School of Public Health, Boston, MA, USA. [e-mail].
Department of Cell Biology, Harvard Medical School, Boston, MA, USA. [e-mail].
Broad Institute of MIT and Harvard, Cambridge, MA, USA. [e-mail].
Cell Biology Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York, NY, USA. [e-mail].

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 54.2 kDa 
• Atom Count: 3,510 
• Modeled Residue Count: 441 
• Deposited Residue Count: 484 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Lysophospholipid acyltransferase 7	A	484	Homo sapiens	Mutation(s): 0  Gene Names: MBOAT7, BB1, LENG4, OACT7 EC: 2.3.1 Membrane Entity: Yes
UniProt & NIH Common Fund Data Resources
Find proteins for Q96N66 (Homo sapiens) Explore Q96N66  Go to UniProtKB:  Q96N66
PHAROS:  Q96N66 GTEx:  ENSG00000125505

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.70 Å
• Aggregation State: 2D ARRAY 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2023-09-27 
Deposition Author(s): Wang, K., Liao, M., Farese, R.V., Walther, T.C.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Center for Research Resources (NIH/NCRR)	United States	R01GM141050
Howard Hughes Medical Institute (HHMI)	United States	--

Revision History  

• Version 1.0: 2023-09-27
  Type: Initial release
  
• Version 1.1: 2025-06-04
  Changes: Data collection, Structure summary