1NL3

CRYSTAL STRUCTURE OF THE SECA PROTEIN TRANSLOCATION ATPASE FROM MYCOBACTERIUM TUBERCULOSIS in APO FORM


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.193 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal Structure of M. tuberculosis SecA, A Preprotein Translocating ATPase

Sharma, V.Arockiasamy, A.Ronning, D.R.Savva, C.G.Holzenburg, A.Braunstein, M.Jacobs Jr., W.R.Sacchettini, J.C.

(2003) Proc.Natl.Acad.Sci.USA 100: 2243-2248

  • DOI: 10.1073/pnas.0538077100
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • In bacteria, the majority of exported proteins are translocated by the Sec system, which recognizes the signal sequence of a preprotein and uses ATP and the proton motive force to mediate protein translocation across the cytoplasmic membrane. SecA is ...

    In bacteria, the majority of exported proteins are translocated by the Sec system, which recognizes the signal sequence of a preprotein and uses ATP and the proton motive force to mediate protein translocation across the cytoplasmic membrane. SecA is an essential protein component of this system, containing the molecular motor that facilitates translocation. Here we report the three-dimensional structure of the SecA protein of Mycobacterium tuberculosis. Each subunit of the homodimer contains a "motor" domain and a translocation domain. The structure predicts that SecA can interact with the SecYEG pore and function as a molecular ratchet that uses ATP hydrolysis for physical movement of the preprotein. Knowledge of this structure provides a framework for further elucidation of the translocation process.


    Organizational Affiliation

    Center for Structural Biology, Institute of Biosciences and Technology, Houston, TX 77030, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PREPROTEIN TRANSLOCASE SECA 1 SUBUNIT
A, B
922Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)Mutation(s): 0 
Gene Names: secA1
Find proteins for P9WGP5 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Go to UniProtKB:  P9WGP5
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.193 
  • Space Group: P 62 2 2
Unit Cell:
Length (Å)Angle (°)
a = 206.196α = 90.00
b = 206.196β = 90.00
c = 295.412γ = 120.00
Software Package:
Software NamePurpose
HKL-2000data reduction
SHARPphasing
REFMACrefinement
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-03-04
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance