7LPR

STRUCTURAL BASIS FOR BROAD SPECIFICITY IN ALPHA-LYTIC PROTEASE MUTANTS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Observed: 0.136 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Structural basis for broad specificity in alpha-lytic protease mutants.

Bone, R.Fujishige, A.Kettner, C.A.Agard, D.A.

(1991) Biochemistry 30: 10388-10398

  • DOI: https://doi.org/10.1021/bi00107a005
  • Primary Citation of Related Structures:  
    2LPR, 3LPR, 5LPR, 6LPR, 7LPR, 8LPR, 9LPR

  • PubMed Abstract: 

    Binding pocket mutants of alpha-lytic protease (Met 192----Ala and Met 213----Ala) have been constructed recently in an effort to create a protease specific for Met just prior to the scissile bond. Instead, mutation resulted in proteases with extraordinarily broad specificity profiles and high activity [Bone, R., Silen, J. L., & Agard, D. A. (1989) Nature 339, 191-195]. To understand the structural basis for the unexpected specificity profiles of these mutants, high-resolution X-ray crystal structures have been determined for complexes of each mutant with a series of systematically varying peptidylboronic acids. These inhibitory analogues of high-energy reaction intermediates provide models for how substrates with different side chains interact with the enzyme during the transition state. Fifteen structures have been analyzed qualitatively and quantitatively with respect to enzyme-inhibitor hydrogen-bond lengths, buried hydrophobic surface area, unfilled cavity volume, and the magnitude of inhibitor accommodating conformational adjustments (particularly in the region of another binding pocket residue, Val 217A). Comparison of these four parameters with the Ki of each inhibitor and the kcat and Km of the analogous substrates indicates that while no single structural parameter consistently correlates with activity or inhibition, the observed data can be understood as a combination of effects. Furthermore, the relative contribution of each term differs for the three enzymes, reflecting the altered conformational energetics of each mutant. From the extensive structural analysis, it is clear that enzyme flexibility, especially in the region of Val 217A, is primarily responsible for the exceptionally broad specificity observed in either mutant. Taken together, the observed patterns of substrate specificity can be understood to arise directly from interactions between the substrate and the residues lining the specificity pocket and indirectly from interactions between peripheral regions of the protein and the active-site region that serve to modulate active-site flexibility.


  • Organizational Affiliation

    Department of Biochemistry, Howard Hughes Medical Institute, University of California, San Francisco 94143-0448.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ALPHA-LYTIC PROTEASE198Lysobacter enzymogenesMutation(s): 0 
EC: 3.4.21.12
UniProt
Find proteins for P00778 (Lysobacter enzymogenes)
Explore P00778 
Go to UniProtKB:  P00778
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00778
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
METHOXYSUCCINYL-ALA-ALA-PRO-LEUCINE BORONIC ACID INHIBITORB [auth P]5N/AMutation(s): 0 
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download Ideal Coordinates CCD File 
C [auth A]SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
BLE
Query on BLE
B [auth P]PEPTIDE-LIKEC5 H14 B N O2LEU
Biologically Interesting Molecules (External Reference) 1 Unique
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Observed: 0.136 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 66.31α = 90
b = 66.31β = 90
c = 80.31γ = 120
Software Package:
Software NamePurpose
PROLSQrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1993-01-15
    Type: Initial release
  • Version 1.1: 2008-03-25
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Atomic model, Database references, Derived calculations, Non-polymer description, Structure summary, Version format compliance
  • Version 1.3: 2012-12-12
    Changes: Other
  • Version 1.4: 2024-06-05
    Changes: Data collection, Database references, Derived calculations, Other