1TM6 | pdb_00001tm6

NMR Structure of the Free Zinc Binding C-terminal Domain of SecA

• PDB DOI: https://doi.org/10.2210/pdb1TM6/pdb
• BMRB: 6289

• Classification: PROTEIN TRANSPORT
• Organism(s): Escherichia coli
• Mutation(s): No 


• Deposited: 2004-06-10 Released: 2004-10-12 
• Deposition Author(s): Matousek, W.M., Alexandrescu, A.T.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 500 
• Conformers Submitted: 20 
• Selection Criteria: structures with acceptable covalent geometry,structures with favorable non-bond energy,structures with the least restraint violations,structures with the lowest energy,target function 

Literature

NMR structure of the C-terminal domain of SecA in the free state

Matousek, W.M., Alexandrescu, A.T.

(2004) Biochim Biophys Acta 1702: 163-171

• PubMed: 15488768 
• DOI: https://doi.org/10.1016/j.bbapap.2004.08.012
• Primary Citation Related Structures: 
  1TM6


• PubMed Abstract: 
  

  SecA is an integral component of the prokaryotic Sec preprotein secretory translocase system. We report here the solution NMR structure of a fragment corresponding to the C-terminal domain of Escherichia coli SecA. In the presence of Zn2+, the fragment adopts a shortened version of the classic betabetaalpha zinc finger fold. The isolated C-terminal domain shows substantial differences from the X-ray structure of a homologous SecA domain bound to the chaperone-like cofactor SecB. The differences between the structures of the free and bound forms suggest that binding to SecB causes a perturbation of the C-terminal domain's intrinsically favored betabetaalpha fold.

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Organizational Affiliation: 
• Department of Molecular and Cell Biology, University of Connecticut, 91 North Eagleville Road, U-3125, Storrs, CT 06269-3125, USA.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 2.5 kDa 
• Atom Count: 169 
• Modeled Residue Count: 22 
• Deposited Residue Count: 22 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Preprotein translocase secA subunit	A	22	Escherichia coli	Mutation(s): 0  EC: 7.4.2.8
UniProt
Find proteins for P10408 (Escherichia coli (strain K12)) Explore P10408  Go to UniProtKB:  P10408

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ZN	B [auth A]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 500 
• Conformers Submitted: 20 
• Selection Criteria: structures with acceptable covalent geometry,structures with favorable non-bond energy,structures with the least restraint violations,structures with the lowest energy,target function 

Structure Validation

Entry History 

Deposition Data

• Released Date: 2004-10-12 
Deposition Author(s): Matousek, W.M., Alexandrescu, A.T.

Revision History  

• Version 1.0: 2004-10-12
  Type: Initial release
  
• Version 1.1: 2008-04-30
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2022-03-02
  Changes: Data collection, Database references, Derived calculations
• Version 1.4: 2024-05-22
  Changes: Data collection