2VDA

Solution structure of the SecA-signal peptide complex


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 10 
  • Selection Criteria: LOWEST ENERGY 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural Basis for Signal-Sequence Recognition by the Translocase Motor Seca as Determined by NMR

Gelis, I.Bonvin, A.M.J.J.Keramisanou, D.Koukaki, M.Gouridis, G.Karamanou, S.Economou, A.Kalodimos, C.G.

(2007) Cell 131: 756

  • DOI: 10.1016/j.cell.2007.09.039

  • PubMed Abstract: 
  • Recognition of signal sequences by cognate receptors controls the entry of virtually all proteins to export pathways. Despite its importance, this process remains poorly understood. Here, we present the solution structure of a signal peptide bound to ...

    Recognition of signal sequences by cognate receptors controls the entry of virtually all proteins to export pathways. Despite its importance, this process remains poorly understood. Here, we present the solution structure of a signal peptide bound to SecA, the 204 kDa ATPase motor of the Sec translocase. Upon encounter, the signal peptide forms an alpha-helix that inserts into a flexible and elongated groove in SecA. The mode of binding is bimodal, with both hydrophobic and electrostatic interactions mediating recognition. The same groove is used by SecA to recognize a diverse set of signal sequences. Impairment of the signal-peptide binding to SecA results in significant translocation defects. The C-terminal tail of SecA occludes the groove and inhibits signal-peptide binding, but autoinhibition is relieved by the SecB chaperone. Finally, it is shown that SecA interconverts between two conformations in solution, suggesting a simple mechanism for polypeptide translocation.


    Organizational Affiliation

    Department of Chemistry, Rutgers University, Newark, NJ 07102, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TRANSLOCASE SUBUNIT SECA
A
828Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: secA (azi, pea, prlD)
Find proteins for P10408 (Escherichia coli (strain K12))
Go to UniProtKB:  P10408
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
MALTOPORIN
B
28Escherichia coli O6:H1 (strain CFT073 / ATCC 700928 / UPEC)Mutation(s): 0 
Gene Names: lamB
Find proteins for Q8CVI4 (Escherichia coli O6:H1 (strain CFT073 / ATCC 700928 / UPEC))
Go to UniProtKB:  Q8CVI4
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 10 
  • Selection Criteria: LOWEST ENERGY 
  • Olderado: 2VDA Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-11-27
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2018-01-24
    Type: Source and taxonomy