1fw3

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{{STRUCTURE_1fw3| PDB=1fw3 | SCENE= }}
{{STRUCTURE_1fw3| PDB=1fw3 | SCENE= }}
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'''OUTER MEMBRANE PHOSPHOLIPASE A FROM ESCHERICHIA COLI'''
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===OUTER MEMBRANE PHOSPHOLIPASE A FROM ESCHERICHIA COLI===
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==Overview==
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Outer membrane phospholipase A (OMPLA) is an integral membrane enzyme that catalyses the hydrolysis of phospholipids. Enzymatic activity is regulated by reversible dimerisation and calcium-binding. We have investigated the role of calcium by X-ray crystallography. In monomeric OMPLA, one calcium ion binds between two external loops (L3L4 site) at 10 A from the active site. After dimerisation, a new calcium-binding site (catalytic site) is formed at the dimer interface in the active site of each molecule at 6 A from the L3L4 calcium site. The close spacing and the difference in calcium affinity of both sites suggests that the L3L4 site may function as a storage site for a calcium ion, which relocates to the catalytic site upon dimerisation. A sequence alignment demonstrates conservation of the catalytic calcium site but evolutionary variation of the L3L4 site. The residues in the dimer interface are conserved as well, suggesting that all outer membrane phospholipases require dimerisation and calcium in the catalytic site for activity. For this family of phospholipases, we have characterised a consensus sequence motif (YTQ-X(n)-G-X(2)-H-X-SNG) that contains conserved residues involved in dimerisation and catalysis.
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(as it appears on PubMed at http://www.pubmed.gov), where 11371166 is the PubMed ID number.
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{{ABSTRACT_PUBMED_11371166}}
==About this Structure==
==About this Structure==
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[[Category: Anti-parallel beta barrel dimer]]
[[Category: Anti-parallel beta barrel dimer]]
[[Category: Membrane protein]]
[[Category: Membrane protein]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 16:49:53 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 04:01:54 2008''

Revision as of 01:01, 1 July 2008

Image:1fw3.png

Template:STRUCTURE 1fw3

OUTER MEMBRANE PHOSPHOLIPASE A FROM ESCHERICHIA COLI

Template:ABSTRACT PUBMED 11371166

About this Structure

1FW3 is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

Reference

Structural investigations of calcium binding and its role in activity and activation of outer membrane phospholipase A from Escherichia coli., Snijder HJ, Kingma RL, Kalk KH, Dekker N, Egmond MR, Dijkstra BW, J Mol Biol. 2001 Jun 1;309(2):477-89. PMID:11371166

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