1Q8Z

The apoenzyme structure of the yeast SR protein kinase, Sky1p


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.221 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Nucleotide-Induced Conformational Changes in the Saccharomyces cerevisiae SR Protein Kinase, Sky1p, Revealed by X-Ray Crystallography

Nolen, B.Ngo, J.Chakrabarti, S.Vu, D.Adams, J.A.Ghosh, G.

(2003) Biochemistry 42: 9575-9585

  • DOI: 10.1021/bi0344331
  • Primary Citation of Related Structures:  
    1Q97, 1Q8Z, 1Q8Y, 1Q99

  • PubMed Abstract: 
  • Conformational changes are thought to play a key role in the function of active protein kinases, although little is known about how these changes relate to the mechanism of phosphorylation. Here we present four high-resolution structures of a single crystal form of Sky1p, a constitutively active serine kinase implicated in yeast RNA processing, each in a different state of nucleotide binding ...

    Conformational changes are thought to play a key role in the function of active protein kinases, although little is known about how these changes relate to the mechanism of phosphorylation. Here we present four high-resolution structures of a single crystal form of Sky1p, a constitutively active serine kinase implicated in yeast RNA processing, each in a different state of nucleotide binding. By comparing the apoenzyme structure to the ADP- and ATP-bound Sky1p structures, we have revealed conformational changes caused by ATP binding or conversion from nucleotide reactant to product. Rotation of the small lobe of the kinase closes the cleft upon binding, allowing the nucleotide to interact with residues from both lobes of the kinase, although some interactions thought to be important for phosphotransfer are missing in the ATP-containing structure. In the apoenzyme, a kinase-conserved phosphate-anchoring loop is in a twisted conformation that is incompatible with ADP and ATP binding, providing a potential mechanism for facilitating ADP release in Sky1p. The nonhydrolyzable ATP analogue AMP-PNP binds in a unique mode that fails to induce lobe closure. This observation, along with comparisons between the two independent molecules in the asymmetric unit of each structure, has provided new molecular details about how the nucleotide binds and induces closure. Finally, we have used mutational analysis to establish the importance of a glycine within the linker that connects the two lobes of Sky1p.


    Organizational Affiliation

    Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
SR Protein Kinase AB373Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: SKY1
EC: 2.7.1 (PDB Primary Data), 2.7.11.1 (UniProt)
Find proteins for Q03656 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore Q03656 
Go to UniProtKB:  Q03656
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.221 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 72.99α = 90
b = 88.701β = 90
c = 135.6γ = 90
Software Package:
Software NamePurpose
CNSrefinement
SCALEPACKdata scaling
XTALVIEWrefinement
HKL-2000data collection
HKL-2000data reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-09-23
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-08-02
    Changes: Refinement description, Source and taxonomy
  • Version 1.4: 2019-07-24
    Changes: Data collection, Derived calculations, Refinement description