1QD6

OUTER MEMBRANE PHOSPHOLIPASE A FROM ESCHERICHIA COLI

Summary for 1QD6

• Entry DOI: 10.2210/pdb1qd6/pdb
• Related: 1QD5
• Descriptor: OUTER MEMBRANE PHOSPHOLIPASE (OMPLA), PROTEIN (OUTER MEMBRANE PHOSPHOLIPASE (OMPLA)), CALCIUM ION, ... (5 entities in total)
• Functional Keywords: anti-parallel beta barrel dimer, membrane protein
• Biological source: Escherichia coli
• Cellular location: Cell outer membrane ; Multi-pass membrane protein : P0A921 P0A921
• Total number of polymer chains: 4
• Total formula weight: 58925.64

Authors

Snijder, H.J.,Ubarretxena-Belandia, I.,Blaauw, M.,Kalk, K.H.,Verheij, H.M.,Egmond, M.R.,Dekker, N.,Dijkstra, B.W. (deposition date: 1999-07-09, release date: 1999-10-25, Last modification date: 2024-10-09)

Primary citation

Snijder, H.J.,Ubarretxena-Belandia, I.,Blaauw, M.,Kalk, K.H.,Verheij, H.M.,Egmond, M.R.,Dekker, N.,Dijkstra, B.W.
Structural evidence for dimerization-regulated activation of an integral membrane phospholipase.
Nature, 401:717-721, 1999

PubMed Abstract: Dimerization is a biological regulatory mechanism employed by both soluble and membrane proteins. However, there are few structural data on the factors that govern dimerization of membrane proteins. Outer membrane phospholipase A (OMPLA) is an integral membrane enzyme which participates in secretion of colicins in Escherichia coli. In Campilobacter and Helicobacter pylori strains, OMPLA is implied in virulence. Its activity is regulated by reversible dimerization. Here we report X-ray structures of monomeric and dimeric OMPLA from E. coli. Dimer interactions occur almost exclusively in the apolar membrane-embedded parts, with two hydrogen bonds within the hydrophobic membrane area being key interactions. Dimerization results in functional oxyanion holes and substrate-binding pockets, which are absent in monomeric OMPLA. These results provide a detailed view of activation by dimerization of a membrane protein.

PubMed: 10537112
DOI: 10.1038/44890

Experimental method

X-RAY DIFFRACTION (2.1 Å)