5T94

Crystal structure of Kap60 bound to yeast RCC1 (Prp20)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.631 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.217 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Three-dimensional context rather than NLS amino acid sequence determines importin alpha subtype specificity for RCC1.

Sankhala, R.S.Lokareddy, R.K.Begum, S.Pumroy, R.A.Gillilan, R.E.Cingolani, G.

(2017) Nat Commun 8: 979-979

  • DOI: 10.1038/s41467-017-01057-7
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Active nuclear import of Ran exchange factor RCC1 is mediated by importin α3. This pathway is essential to generate a gradient of RanGTP on chromatin that directs nucleocytoplasmic transport, mitotic spindle assembly and nuclear envelope formation. H ...

    Active nuclear import of Ran exchange factor RCC1 is mediated by importin α3. This pathway is essential to generate a gradient of RanGTP on chromatin that directs nucleocytoplasmic transport, mitotic spindle assembly and nuclear envelope formation. Here we identify the mechanisms of importin α3 selectivity for RCC1. We find this isoform binds RCC1 with one order of magnitude higher affinity than the generic importin α1, although the two isoforms share an identical NLS-binding groove. Importin α3 uses its greater conformational flexibility to wedge the RCC1 β-propeller flanking the NLS against its lateral surface, preventing steric clashes with its Armadillo-core. Removing the β-propeller, or inserting a linker between NLS and β-propeller, disrupts specificity for importin α3, demonstrating the structural context rather than NLS sequence determines selectivity for isoform 3. We propose importin α3 evolved to recognize topologically complex NLSs that lie next to bulky domains or are masked by quaternary structures.Importin α3 facilitates the nuclear transport of the Ran guanine nucleotide exchange factor RCC1. Here the authors reveal the molecular basis for the selectivity of RCC1 for importin α3 vs the generic importin α1 and discuss the evolution of importin α isoforms.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, Thomas Jefferson University, 233 South 10th Street, Philadelphia, PA, 19107, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Guanine nucleotide exchange factor SRM1
A
482Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: SRM1 (MTR1, PRP20)
Find proteins for P21827 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P21827
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Importin subunit alpha
B
542Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: SRP1 (KAP60)
Find proteins for Q02821 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  Q02821
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.631 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.217 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 91.050α = 90.00
b = 99.200β = 90.00
c = 125.030γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
PHASERphasing
PHENIXrefinement
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical SciencesUnited StatesGM074846
National Institutes of Health/National Institute of General Medical SciencesUnited StatesGM100888

Revision History 

  • Version 1.0: 2017-09-13
    Type: Initial release
  • Version 1.1: 2017-11-01
    Type: Author supporting evidence, Database references
  • Version 1.2: 2019-04-17
    Type: Author supporting evidence, Data collection