1OU9

Structure of SspB, a AAA+ protease delivery protein


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.217 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structure of a delivery protein for an AAA+ protease in complex with a peptide degradation tag

Levchenko, I.Grant, R.A.Wah, D.A.Sauer, R.T.Baker, T.A.

(2003) Mol.Cell 12: 365-372

  • Primary Citation of Related Structures:  1OU8, 1OUL

  • PubMed Abstract: 
  • Substrate selection by AAA+ ATPases that function to unfold proteins or alter protein conformation is often regulated by delivery or adaptor proteins. SspB is a protein dimer that binds to the ssrA degradation tag and delivers proteins bearing this t ...

    Substrate selection by AAA+ ATPases that function to unfold proteins or alter protein conformation is often regulated by delivery or adaptor proteins. SspB is a protein dimer that binds to the ssrA degradation tag and delivers proteins bearing this tag to ClpXP, an AAA+ protease, for degradation. Here, we describe the structure of the peptide binding domain of H. influenzae SspB in complex with an ssrA peptide at 1.6 A resolution. The ssrA peptides are bound in well-defined clefts located at the extreme ends of the SspB homodimer. SspB contacts residues within the N-terminal and central regions of the 11 residue ssrA tag but leaves the C-terminal residues exposed and positioned to dock with ClpX. This structure, taken together with biochemical analysis of SspB, suggests mechanisms by which proteins like SspB escort substrates to AAA+ ATPases and enhance the specificity and affinity of target recognition.


    Related Citations: 
    • A specificity-enhancing factor for the ClpXP degradation machine
      Levchenko, I.,Siedel, M.,Sauer, R.T.,Baker, T.A.
      (2000) Science 289: 2354


    Organizational Affiliation

    Howard Hughes Medical Institute, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Stringent starvation protein B homolog
A, B, C
129Haemophilus influenzae (strain ATCC 51907 / DSM 11121 / KW20 / Rd)Gene Names: sspB
Find proteins for P45206 (Haemophilus influenzae (strain ATCC 51907 / DSM 11121 / KW20 / Rd))
Go to UniProtKB:  P45206
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B, C
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.217 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 65.292α = 90.00
b = 137.839β = 90.00
c = 93.790γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
SCALEPACKdata scaling
HKL-2000data collection
SOLVEphasing
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-09-23
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2014-04-30
    Type: Data collection