Crystal structure of undecaprenyl-pyrophosphate phosphatase and its role in peptidoglycan biosynthesis - CEA - Commissariat à l’énergie atomique et aux énergies alternatives Access content directly
Journal Articles Nature Communications Year : 2018

Crystal structure of undecaprenyl-pyrophosphate phosphatase and its role in peptidoglycan biosynthesis

Abstract

As a protective envelope surrounding the bacterial cell, the peptidoglycan sacculus is a site of vulnerability and an antibiotic target. Peptidoglycan components, assembled in the cytoplasm, are shuttled across the membrane in a cycle that uses undecaprenyl-phosphate. A product of peptidoglycan synthesis, undecaprenyl-pyrophosphate, is converted to undecaprenyl-phosphate for reuse in the cycle by the membrane integral pyrophosphatase, BacA. To understand how BacA functions, we determine its crystal structure at 2.6 Å resolution. The enzyme is open to the periplasm and to the periplasmic leaflet via a pocket that extends into the membrane. Conserved residues map to the pocket where pyrophosphorolysis occurs. BacA incorporates an interdigitated inverted topology repeat, a topology type thus far only reported in transporters and channels. This unique topology raises issues regarding the ancestry of BacA, the possibility that BacA has alternate active sites on either side of the membrane and its possible function as a flippase.

Domains

Bioengineering

Dates and versions

cea-01876552 , version 1 (18-09-2018)

Identifiers

Cite

Meriem El Ghachi, Nicole Howe, Chia-Ying Huang, Vincent Oliéric, Rangana Warshamanage, et al.. Crystal structure of undecaprenyl-pyrophosphate phosphatase and its role in peptidoglycan biosynthesis. Nature Communications, 2018, 9, pp.1078. ⟨10.1038/s41467-018-03477-5⟩. ⟨cea-01876552⟩
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