1KBF

Solution Structure of the Cysteine-Rich C1 Domain of Kinase Suppressor of Ras


Experimental Data Snapshot

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

wwPDB Validation   3D Report Full Report


This is version 2.2 of the entry. See complete history


Literature

Solution structure and functional analysis of the cysteine-rich C1 domain of kinase suppressor of Ras (KSR).

Zhou, M.Horita, D.A.Waugh, D.S.Byrd, R.A.Morrison, D.K.

(2002) J Mol Biol 315: 435-446

  • DOI: https://doi.org/10.1006/jmbi.2001.5263
  • Primary Citation of Related Structures:  
    1KBE, 1KBF

  • PubMed Abstract: 

    Kinase suppressor of Ras (KSR) is a conserved component of the Ras pathway that acts as a molecular scaffold to promote signal transmission from Raf-1 to MEK and MAPK. All KSR proteins contain a conserved cysteine-rich C1 domain, and studies have implicated this domain in the regulation of KSR1 subcellular localization and function. To further elucidate the biological role of the KSR1 C1 domain, we have determined its three-dimensional solution structure using nuclear magnetic resonance (NMR). We find that while the overall topology of the KSR1 C1 domain is similar to the C1 domains of Raf-1 and PKCgamma, the predicted ligand-binding region and the surface charge distribution are unique. Moreover, by generating chimeric proteins in which these domains have been swapped, we find that the C1 domains of Raf-1, PKCgamma, and KSR1 are not functionally interchangeable. The KSR1 C1 domain does not bind with high affinity or respond biologically to phorbol esters or ceramide, and it does not interact directly with Ras, indicating that the putative ligand(s) for the KSR1 C1 domain are distinct from those that interact with PKCgamma and Raf-1. In addition, our analysis of the chimeric proteins supports the model that Raf-1 is a ceramide-activated kinase and that its C1 domain is involved in the ceramide-mediated response. Finally, our findings demonstrate an absolute requirement of the KSR1 C1 domain in mediating the membrane localization of KSR1, a crucial feature of its scaffolding activity. Together, these results underscore the functional specificity of these important regulatory domains and demonstrate that the structural features of the C1 domains can provide valuable insight into their ligand-binding properties.


  • Organizational Affiliation

    Regulation of Cell Growth Laboratory, National Cancer Institute, Frederick Cancer Research and Development Center, Frederick, MD 21702, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Kinase suppressor of Ras 149Mus musculusMutation(s): 0 
Gene Names: Ksr1Ksr
EC: 2.7.11.1
Membrane Entity: Yes 
UniProt
Find proteins for Q61097 (Mus musculus)
Explore Q61097 
Go to UniProtKB:  Q61097
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ61097
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

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

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-01-23
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-12-25
    Changes: Database references, Derived calculations, Other
  • Version 2.0: 2020-02-26
    Type: Coordinate replacement
    Reason: Model orientation/position
    Changes: Atomic model, Author supporting evidence, Data collection, Database references, Derived calculations, Experimental preparation, Other, Refinement description, Source and taxonomy, Structure summary
  • Version 2.1: 2024-04-17
    Changes: Data collection, Database references, Derived calculations, Other
  • Version 2.2: 2024-10-30
    Changes: Database references, Structure summary