8BZ2

Crystal structure of outer membrane attachment porin OmpM1 SLH domain

Summary for 8BZ2

• Entry DOI: 10.2210/pdb8bz2/pdb
• Descriptor: S-layer homology domain-containing protein, SULFATE ION (3 entities in total)
• Functional Keywords: outer membrane attachment, peptidoglycan-binding, structural protein
• Biological source: Veillonella parvula
• Total number of polymer chains: 3
• Total formula weight: 32402.49

Authors

Silale, A.,van den Berg, B. (deposition date: 2022-12-14, release date: 2023-11-08, Last modification date: 2023-12-27)

Primary citation

Silale, A.,Zhu, Y.,Witwinowski, J.,Smith, R.E.,Newman, K.E.,Bhamidimarri, S.P.,Basle, A.,Khalid, S.,Beloin, C.,Gribaldo, S.,van den Berg, B.
Dual function of OmpM as outer membrane tether and nutrient uptake channel in diderm Firmicutes.
Nat Commun, 14:7152-7152, 2023

PubMed Abstract: The outer membrane (OM) in diderm, or Gram-negative, bacteria must be tethered to peptidoglycan for mechanical stability and to maintain cell morphology. Most diderm phyla from the Terrabacteria group have recently been shown to lack well-characterised OM attachment systems, but instead have OmpM, which could represent an ancestral tethering system in bacteria. Here, we have determined the structure of the most abundant OmpM protein from Veillonella parvula (diderm Firmicutes) by single particle cryogenic electron microscopy. We also characterised the channel properties of the transmembrane β-barrel of OmpM and investigated the structure and PG-binding properties of its periplasmic stalk region. Our results show that OM tethering and nutrient acquisition are genetically linked in V. parvula, and probably other diderm Terrabacteria. This dual function of OmpM may have played a role in the loss of the OM in ancestral bacteria and the emergence of monoderm bacterial lineages.

PubMed: 37932269
DOI: 10.1038/s41467-023-42601-y

Experimental method

X-RAY DIFFRACTION (1.7 Å)