2XRM

Processed Intracellular subtilisin from B. clausii


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.202 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Regulation of an Intracellular Subtilisin Protease Activity by a Short Propeptide Sequence Through an Original Combined Dual Mechanism.

Gamble, M.Kunze, G.Dodson, E.J.Wilson, K.S.Jones, D.D.

(2011) Proc Natl Acad Sci U S A 108: 3536

  • DOI: 10.1073/pnas.1014229108
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • A distinct class of the biologically important subtilisin family of serine proteases functions exclusively within the cell and forms a major component of the bacilli degradome. However, the mode and mechanism of posttranslational regulation of intrac ...

    A distinct class of the biologically important subtilisin family of serine proteases functions exclusively within the cell and forms a major component of the bacilli degradome. However, the mode and mechanism of posttranslational regulation of intracellular protease activity are unknown. Here we describe the role played by a short N-terminal extension prosequence novel amongst the subtilisins that regulates intracellular subtilisin protease (ISP) activity through two distinct modes: active site blocking and catalytic triad rearrangement. The full-length proenzyme (proISP) is inactive until specific proteolytic processing removes the first 18 amino acids that comprise the N-terminal extension, with processing appearing to be performed by ISP itself. A synthetic peptide corresponding to the N-terminal extension behaves as a mixed noncompetitive inhibitor of active ISP with a K(i) of 1 μM. The structure of the processed form has been determined at 2.6 Å resolution and compared with that of the full-length protein, in which the N-terminal extension binds back over the active site. Unique to ISP, a conserved proline introduces a backbone kink that shifts the scissile bond beyond reach of the catalytic serine and in addition the catalytic triad is disrupted. In the processed form, access to the active site is unblocked by removal of the N-terminal extension and the catalytic triad rearranges to a functional conformation. These studies provide a new molecular insight concerning the mechanisms by which subtilisins and protease activity as a whole, especially within the confines of a cell, can be regulated.


    Organizational Affiliation

    School of Biosciences, Cardiff University, Cardiff CF10 3AT, United Kingdom.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
INTRACELLULAR SUBTILISIN PROTEASE
A
311Bacillus clausiiMutation(s): 1 
Gene Names: isp
EC: 3.4.21.62
Find proteins for D0AB41 (Bacillus clausii)
Go to UniProtKB:  D0AB41
Protein Feature View
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
1PE
Query on 1PE

Download CCD File 
A
PENTAETHYLENE GLYCOL
C10 H22 O6
JLFNLZLINWHATN-UHFFFAOYSA-N
 Ligand Interaction
SR
Query on SR

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A
STRONTIUM ION
Sr
PWYYWQHXAPXYMF-UHFFFAOYSA-N
 Ligand Interaction
CA
Query on CA

Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
NA
Query on NA

Download CCD File 
A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.202 
  • Space Group: I 2 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 132.982α = 90
b = 132.982β = 90
c = 132.982γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-03-16
    Type: Initial release
  • Version 1.1: 2013-11-27
    Changes: Source and taxonomy, Version format compliance
  • Version 1.2: 2018-01-24
    Changes: Advisory, Source and taxonomy