Biological Assembly 1  

 3D View: Structure

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 21.34 kDa 
• Atom Count: 626 
• Residue Count: 77 
• Unique protein chains: 1

2KSE

Backbone structure of the membrane domain of E. coli histidine kinase receptor QseC, Center for Structures of Membrane Proteins (CSMP) target 4311C

• DOI: 10.2210/pdb2KSE/pdb

• Classification: TRANSFERASE
• Organism(s): Escherichia coli K-12
• Mutation(s): No 


• Deposited: 2010-01-02 Released: 2010-03-02 
• Deposition Author(s): Maslennikov, I., Klammt, C., Kefala, G., Esquivies, L., Kwiatkowski, W., Choe, S., Center for Structures of Membrane Proteins (CSMP)

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 200 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Literature

Membrane domain structures of three classes of histidine kinase receptors by cell-free expression and rapid NMR analysis.

Maslennikov, I., Klammt, C., Hwang, E., Kefala, G., Okamura, M., Esquivies, L., Mors, K., Glaubitz, C., Kwiatkowski, W., Jeon, Y.H., Choe, S.

(2010) Proc Natl Acad Sci U S A 107: 10902-10907

• PubMed: 20498088 
• DOI: 10.1073/pnas.1001656107
• Primary Citation of Related Structures:  
  2KSF, 2KSE, 2KSD


• PubMed Abstract: 
  

NMR structural studies of membrane proteins (MP) are hampered by complications in MP expression, technical difficulties associated with the slow process of NMR spectral peak assignment, and limited distance information obtainable for transmembrane (TM) helices. To overcome the inherent challenges in the determination of MP structures, we have developed a rapid and cost-efficient strategy that combines cell-free (CF) protein synthesis, optimized combinatorial dual-isotope labeling for nearly instant resonance assignment, and fast acquisition of long-distance information using paramagnetic probes. Here we report three backbone structures for the TM domains of the three classes of Escherichia coli histidine kinase receptors (HKRs). The ArcB and QseC TM domains are both two-helical motifs, whereas the KdpD TM domain comprises a four-helical bundle with shorter second and third helices. The interhelical distances (up to 12 A) reveal weak interactions within the TM domains of all three receptors. Determined consecutively within 8 months, these structures offer insight into the abundant and underrepresented in the Protein Data Bank class of 2-4 TM crossers and demonstrate the efficiency of our CF combinatorial dual-labeling strategy, which can be applied to solve MP structures in high numbers and at a high speed. Our results greatly expand the current knowledge of HKR structure, opening the doors to studies on their widespread and pharmaceutically important bacterial signaling mechanism.

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Organizational Affiliation: 

Structural Biology Laboratory, The Salk Institute for Biological Studies, La Jolla, CA 92037, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Sensor protein qseC	A	186	Escherichia coli K-12	Mutation(s): 0  Gene Names: b3026, JW2994, qseC, ygiY EC: 2.7.13.3
Membrane protein Mpstruc	Group:  TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group:  Histidine Kinase Receptors	Protein:  QseC (1-185) Sensor protein membrane domain
Find proteins for P40719 (Escherichia coli (strain K12)) Explore P40719  Go to UniProtKB:  P40719

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 200 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 
• OLDERADO: 2KSE Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2010-01-02 
• Released Date: 2010-03-02 
Deposition Author(s): Maslennikov, I., Klammt, C., Kefala, G., Esquivies, L., Kwiatkowski, W., Choe, S., Center for Structures of Membrane Proteins (CSMP)

Revision History 

• Version 1.0: 2010-03-02
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2012-12-05
  Changes: Database references