1HPG

A glutamic acid specific serine protease utilizes a novel histidine triad in substrate binding


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Work: 0.181 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

A glutamic acid specific serine protease utilizes a novel histidine triad in substrate binding.

Nienaber, V.L.Breddam, K.Birktoft, J.J.

(1993) Biochemistry 32: 11469-11475


  • PubMed Abstract: 
  • Proteases specific for cleavage after acidic residues have been implicated in several disease states, including epidermolysis, inflammation, and viral processing. A serine protease with specificity toward glutamic acid substrates (Glu-SGP) has been c ...

    Proteases specific for cleavage after acidic residues have been implicated in several disease states, including epidermolysis, inflammation, and viral processing. A serine protease with specificity toward glutamic acid substrates (Glu-SGP) has been crystallized in the presence of a tetrapeptide ligand and its structure determined and refined to an R-factor of 17% at 2.0-A resolution. This structure provides an initial description of the design of proteolytic specificity for negatively charged residues. While the overall fold of Glu-SGP closely resembles that observed in the pancreatic-type serine proteases, stabilization of the negatively charged substrate when bound to this protein appears to involve a more extensive part of the protease than previously observed. The substrate carboxylate is bound to a histidine side chain, His213, which provides the primary electrostatic compensation of the negative charge on the substrate, and to two serine hydroxyls, Ser192 and Ser216. Glu-SGP displays maximum activity at pH 8.3, and assuming normal pKa's, the glutamate side chain and His213 will be negatively charged and neutral, respectively, at this pH. In order for His213 to carry a positive charge at the optimal pH, its pKa will have to be raised by at least two units. An alternative mechanism for substrate charge compensation is suggested that involves a novel histidine triad, His213, His199, and His228, not observed in any other serine protease. The C-terminal alpha-helix, ubiquitous to all pancreatic-type proteases, is directly linked to this histidine triad and may also play a role in substrate stabilization.(ABSTRACT TRUNCATED AT 250 WORDS)


    Organizational Affiliation

    Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St. Louis, Missouri 63110.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Glutamic acid specific protease
A
187Streptomyces griseusMutation(s): 0 
Gene Names: sprE
EC: 3.4.21.82
Find proteins for Q07006 (Streptomyces griseus)
Go to UniProtKB:  Q07006
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
BOC-ALA-ALA-PRO-GLU PEPTIDE
B
5N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Biologically Interesting Molecules 1 Unique
IDChainsNameType/Class2D Diagram3D Interactions
PRD_000393
Query on PRD_000393
BN-(tert-butoxycarbonyl)-L-alanyl-L-alanyl-L-prolyl-L-glutamic acidPeptide-like / Inhibitor

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Work: 0.181 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 77.260α = 90.00
b = 36.290β = 101.80
c = 51.220γ = 90.00
Software Package:
Software NamePurpose
X-PLORphasing
X-PLORrefinement
X-PLORmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1995-07-10
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Atomic model, Database references, Derived calculations, Non-polymer description, Structure summary, Version format compliance
  • Version 1.3: 2012-12-12
    Type: Other
  • Version 1.4: 2017-11-29
    Type: Derived calculations, Other