Structure of Hamp(AF1503)-Tsr fusion - Hamp (A291V) mutant

Experimental Data Snapshot

  • Resolution: 2.65 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.231 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


Axial Helix Rotation as a Mechanism for Signal Regulation Inferred from the Crystallographic Analysis of the E. Coli Serine Chemoreceptor.

Ferris, H.U.Zeth, K.Hulko, M.Dunin-Horkawicz, S.Lupas, A.N.

(2014) J Struct Biol 186: 349

  • DOI: https://doi.org/10.1016/j.jsb.2014.03.015
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Bacterial chemotaxis receptors are elongated homodimeric coiled-coil bundles, which transduce signals generated in an N-terminal sensor domain across 15-20nm to a conserved C-terminal signaling subdomain. This signal transduction regulates the activity of associated kinases, altering the behavior of the flagellar motor and hence cell motility. Signaling is in turn modulated by selective methylation and demethylation of specific glutamate and glutamine residues in an adaptation subdomain. We have determined the structure of a chimeric protein, consisting of the HAMP domain from Archaeoglobus fulgidus Af1503 and the methyl-accepting domain of Escherichia coli Tsr. It shows a 21nm coiled coil that alternates between two coiled-coil packing modes: canonical knobs-into-holes and complementary x-da, a variant form related to the canonical one by axial rotation of the helices. Comparison of the obtained structure to the Thermotoga maritima chemoreceptor TM1143 reveals that they adopt different axial rotation states in their adaptation subdomains. This conformational change is presumably induced by the upstream HAMP domain and may modulate the affinity of the chemoreceptor to the methylation-demethylation system. The presented findings extend the cogwheel model for signal transmission to chemoreceptors.

  • Organizational Affiliation

    Department of Protein Evolution, Max Planck Institute for Developmental Biology, 72076 Tübingen, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
341Archaeoglobus fulgidus DSM 4304Escherichia coli K-12Mutation(s): 1 
Gene Names: AF_1503tsr
Find proteins for P02942 (Escherichia coli (strain K12))
Explore P02942 
Go to UniProtKB:  P02942
Find proteins for O28769 (Archaeoglobus fulgidus (strain ATCC 49558 / DSM 4304 / JCM 9628 / NBRC 100126 / VC-16))
Explore O28769 
Go to UniProtKB:  O28769
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsP02942O28769
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.65 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.231 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 112.22α = 90
b = 80.02β = 110.78
c = 139.17γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-02-29
    Type: Initial release
  • Version 1.1: 2014-04-09
    Changes: Data collection, Database references
  • Version 1.2: 2014-06-11
    Changes: Database references
  • Version 1.3: 2017-03-15
    Changes: Source and taxonomy