1go8
From Proteopedia
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'''THE METZINCIN'S METHIONINE: PRTC M226L MUTANT''' | '''THE METZINCIN'S METHIONINE: PRTC M226L MUTANT''' | ||
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[[Category: Baumann, U.]] | [[Category: Baumann, U.]] | ||
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Revision as of 14:48, 2 May 2008
THE METZINCIN'S METHIONINE: PRTC M226L MUTANT
Overview
Serralysins are a family of metalloproteases secreted by Gram-negative bacteria into the medium in the form of inactive zymogens. Usually, all serralysin secretors have on the same operon a gene coding for a periplasmic 10-kDa protein, which is an inhibitor of the secreted protease. The recent characterization of the inhibitor of the alkaline protease from Pseudomonas aeruginosa revealed a surprisingly low dissociation constant of 4 pm, contrary to earlier studies on homologous systems, where inhibition constants in the microm range were reported. To approach a more accurate understanding, the crystal structure of the complex between inhibitor and protease from P. aeruginosa was determined at 1.74 A resolution and refined to R(free) = 0.204. The structure reported here shows clearly that the N terminus of the inhibitor forms a coordinative bond to the catalytic Zn(2+) ion with a nitrogen-zinc distance of 2.17 A. We conclude that this interaction adds substantially to the complex stability and show also that similar interactions are found in other metzincin-inhibitor complexes.
About this Structure
1GO8 is a Single protein structure of sequence from Erwinia chrysanthemi. Full crystallographic information is available from OCA.
Reference
Crystal structure of a complex between Pseudomonas aeruginosa alkaline protease and its cognate inhibitor: inhibition by a zinc-NH2 coordinative bond., Hege T, Feltzer RE, Gray RD, Baumann U, J Biol Chem. 2001 Sep 14;276(37):35087-92. Epub 2001 Jul 9. PMID:11445573 Page seeded by OCA on Fri May 2 17:48:54 2008
