9VUQ

Structure of glycerol-3-phosphate acyltransferase PlsB from Themomonas haemolytica in complex with Palmitoyl-CoA and DOPA

Summary for 9VUQ

• Entry DOI: 10.2210/pdb9vuq/pdb
• EMDB information: 65369
• Descriptor: Glycerol-3-phosphate acyltransferase, (2R)-3-(phosphonooxy)propane-1,2-diyl (9Z,9'Z)bis-octadec-9-enoate, Palmitoyl-CoA, ... (4 entities in total)
• Functional Keywords: phospholipid synthesis, enzyme, single-particle cryo-electron microscopy, lipid transport
• Biological source: Thermomonas haemolytica
• Total number of polymer chains: 2
• Total formula weight: 203146.52

Authors

Li, Y.M.,Liu, X.Y.,Li, A.J.,Liu, Z.F. (deposition date: 2025-07-13, release date: 2026-07-01, Last modification date: 2026-07-08)

Primary citation

Li, Y.,Liu, X.,Li, A.,Liu, Z.
The phospholipid biosynthesis enzyme PlsB contains three distinct domains for membrane association, lysophosphatidic acid synthesis, and dimerization.
Protein Sci., 35:-, 2026

PubMed Abstract: Biosynthesis of phospholipids is fundamental for membrane biogenesis in all living organisms. As a member of the glycerol-3-phosphate (G3P) acyltransferase family, PlsB is a crucial enzyme catalyzing the first step of phospholipid synthesis by converting G3P and fatty acyl-coenzyme A (CoA)/acyl carrier protein (ACP) into lysophosphatidic acid and free CoA (CoASH)/ACP. In bacterial cells, PlsB participates in the formation of antibiotic-tolerant persister cells related to multidrug tolerance, and is hence considered as a potential target for anti-persister therapy. By using the single-particle cryo-electron microscopy method, we have solved the structure of full-length PlsB from Thermomonas haemolytica (ThPlsB) at 2.79 Å resolution. The ThPlsB protein forms a homodimer with C2 symmetry and each monomer contains three distinct domains, namely the amino-terminal domain (NTD), the middle catalytic domain (MCD), and the carboxy-terminal domain. In the MCD, a fatty acyl-CoA binds in a membrane-facing surface groove enclosed by a lipid molecule 1,2-dioleoyl-sn-glycero-3-phosphate (DOPA) on one side. The interactions between ThPlsB and the membrane involve four surface-exposed amphipathic regions located in the NTD and MCD, respectively. Our structural and biochemical analysis results suggest a membrane surface association-catalysis coupling model for the PlsB-mediated biosynthesis of lysophosphatidic acid occurring at the membrane-cytosol interface.

PubMed: 42324731
DOI: 10.1002/pro.70685

Experimental method

ELECTRON MICROSCOPY (2.79 Å)