1NKT

CRYSTAL STRUCTURE OF THE SECA PROTEIN TRANSLOCATION ATPASE FROM MYCOBACTERIUM TUBERCULOSIS COMPLEX WITH ADPBS

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.216 

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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 U S A 100: 2243-2248

  • DOI: 10.1073/pnas.0538077100
  • Primary Citation of Related Structures:  
    1NKT, 1NL3

  • 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 an essential protein component of this system, containing the molecular motor that facilitates translocation ...

    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
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Preprotein translocase secA 1 subunitA, B922Mycobacterium tuberculosisMutation(s): 0 
Gene Names: SECA1 OR SECA OR RV3240C
EC: 7.4.2.8
UniProt
Find proteins for P9WGP5 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WGP5 
Go to UniProtKB:  P9WGP5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP9WGP5
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ADP
Query on ADP
Download Ideal Coordinates CCD File 
D [auth A],
F [auth B]		ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N		 Ligand Interaction
MG
Query on MG
Download Ideal Coordinates CCD File 
C [auth A],
E [auth B]		MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.216 
  • Space Group: P 62 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 206.05α = 90
b = 206.05β = 90
c = 292.857γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
SCALEPACKdata scaling
SHARPphasing

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History  (Full details and data files)

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