1tmn
From Proteopedia
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'''BINDING OF N-CARBOXYMETHYL DIPEPETIDE INHIBITORS TO THERMOLYSIN DETERMINED BY X-RAY CRYSTALLOGRAPHY. A NOVEL CLASS OF TRANSITION-STATE ANALOGUES FOR ZINC PEPTIDASES''' | '''BINDING OF N-CARBOXYMETHYL DIPEPETIDE INHIBITORS TO THERMOLYSIN DETERMINED BY X-RAY CRYSTALLOGRAPHY. A NOVEL CLASS OF TRANSITION-STATE ANALOGUES FOR ZINC PEPTIDASES''' | ||
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==About this Structure== | ==About this Structure== | ||
| - | 1TMN is a [[Single protein]] structure | + | 1TMN is a [[Single protein]] structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1TMN OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Matthews, B W.]] | [[Category: Matthews, B W.]] | ||
[[Category: Monzingo, A F.]] | [[Category: Monzingo, A F.]] | ||
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 10:08:07 2008'' | |
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| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 07:08, 3 May 2008
BINDING OF N-CARBOXYMETHYL DIPEPETIDE INHIBITORS TO THERMOLYSIN DETERMINED BY X-RAY CRYSTALLOGRAPHY. A NOVEL CLASS OF TRANSITION-STATE ANALOGUES FOR ZINC PEPTIDASES
Overview
The mode of binding of the specific thermolysin inhibitor N-(1-carboxy-3-phenylpropyl)-L-leucyl-L-tryptophan (KI approximately 5 X 10(-8) M) [Maycock, A. L., DeSousa, D. M., Payne, L. G., ten Broeke, J., Wu, M. T., & Patchett, A. A. (1981) Biochem. Biophys. Res. Commun. 102, 963-969] has been determined by X-ray crystallography and refined to an R value of 17.1% at 1.9-A resolution. The inhibitor binds to thermolysin with both oxygens of the N-carboxymethyl group liganded to the zinc to give overall pentacoordination of the metal. The bidentate ligation of the inhibitor differs from the monodentate binding seen previously for carboxylate-zinc interactions in thermolysin and is closer to the bidentate geometry observed for the binding of hydroxamates [Holmes, M. A., & Matthews, B. W. (1981) Biochemistry 20, 6912-6920]. The geometry of the inhibitor and its interactions with the protein have a number of elements in common with the presumed transition state formed during peptide hydrolysis. The observed zinc ligation supports the previous suggestion that a pentacoordinate intermediate participates in the mechanism of catalysis. However, the alpha-amino nitrogen of the inhibitor is close to Glu-143, suggesting that this residue might accept a proton from an attacking water molecule (as proposed before) and subsequently donate this proton to the leaving nitrogen. By analogy with thermolysin, it is proposed that a related mechanism should be considered for peptide cleavage by carboxypeptidase A.(ABSTRACT TRUNCATED AT 250 WORDS)
About this Structure
1TMN is a Single protein structure. Full crystallographic information is available from OCA.
Reference
Binding of N-carboxymethyl dipeptide inhibitors to thermolysin determined by X-ray crystallography: a novel class of transition-state analogues for zinc peptidases., Monzingo AF, Matthews BW, Biochemistry. 1984 Nov 20;23(24):5724-9. PMID:6395881 Page seeded by OCA on Sat May 3 10:08:07 2008
