Primary Citation of Related Structures: 1QD5, 1QD6
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 ...
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.
Related Citations:
Crystallization and preliminary X-ray analysis of outer membrane phospholipase A from Escherichia coli Blaauw, M., Dekker, N., Verheij, H.M., Kalk, K.H., Dijkstra, B.W. (1995) FEBS Lett 373: 10
Organizational Affiliation:
Laboratory of Biophysical Chemistry, BIOSON Research Institute, University of Groningen, The Netherlands.
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