1ft7
From Proteopedia
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'''AAP COMPLEXED WITH L-LEUCINEPHOSPHONIC ACID''' | '''AAP COMPLEXED WITH L-LEUCINEPHOSPHONIC ACID''' | ||
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[[Category: Ringe, D.]] | [[Category: Ringe, D.]] | ||
[[Category: Stamper, C.]] | [[Category: Stamper, C.]] | ||
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| - | [[Category: | + | [[Category: Peptidase]] |
| - | [[Category: | + | [[Category: Zinc]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 16:44:20 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 13:44, 2 May 2008
AAP COMPLEXED WITH L-LEUCINEPHOSPHONIC ACID
Overview
The nature of the interaction of the transition-state analogue inhibitor L-leucinephosphonic acid (LPA) with the leucine aminopeptidase from Aeromonas proteolytica (AAP) was investigated. LPA was shown to be a competitive inhibitor at pH 8.0 with a K(i) of 6.6 microM. Electronic absorption spectra, recorded at pH 7.5 of [CoCo(AAP)], [CoZn(AAP)], and [ZnCo(AAP)] upon addition of LPA suggest that LPA interacts with both metal ions in the dinuclear active site. EPR studies on the Co(II)-substituted forms of AAP revealed that the environments of the Co(II) ions in both [CoZn(AAP)] and [ZnCo(AAP)] become highly asymmetric and constrained upon the addition of LPA and clearly indicate that LPA interacts with both metal ions. The X-ray crystal structure of AAP complexed with LPA was determined at 2.1 A resolution. The X-ray crystallographic data indicate that LPA interacts with both metal centers in the dinuclear active site of AAP and a single oxygen atom bridge is absent. Thus, LPA binds to the dinuclear active site of AAP as an eta-1,2-mu-phosphonate with one ligand to the second metal ion provided by the N-terminal amine. A structural comparison of the binding of phosphonate-containing transition-state analogues to the mono- and bimetallic peptidases provides insight into the requirement for the second metal ion in bridged bimetallic peptidases. On the basis of the results obtained from the spectroscopic and X-ray crystallographic data presented herein along with previously reported mechanistic data for AAP, a new catalytic mechanism for the hydrolysis reaction catalyzed by AAP is proposed.
About this Structure
1FT7 is a Single protein structure of sequence from Vibrio proteolyticus. Full crystallographic information is available from OCA.
Reference
Inhibition of the aminopeptidase from Aeromonas proteolytica by L-leucinephosphonic acid. Spectroscopic and crystallographic characterization of the transition state of peptide hydrolysis., Stamper C, Bennett B, Edwards T, Holz RC, Ringe D, Petsko G, Biochemistry. 2001 Jun 19;40(24):7035-46. PMID:11401547 Page seeded by OCA on Fri May 2 16:44:20 2008
