4A1G

The crystal structure of the human Bub1 TPR domain in complex with the KI motif of Knl1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.186 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural Analysis Reveals Features of the Spindle Checkpoint Kinase Bub1-Kinetochore Subunit Knl1 Interaction.

Krenn, V.Wehenkel, A.Li, X.Santaguida, S.Musacchio, A.

(2012) J.Cell Biol. 196: 451

  • DOI: 10.1083/jcb.201110013

  • PubMed Abstract: 
  • The function of the essential checkpoint kinases Bub1 and BubR1 requires their recruitment to mitotic kinetochores. Kinetochore recruitment of Bub1 and BubR1 is proposed to rely on the interaction of the tetratricopeptide repeats (TPRs) of Bub1 and B ...

    The function of the essential checkpoint kinases Bub1 and BubR1 requires their recruitment to mitotic kinetochores. Kinetochore recruitment of Bub1 and BubR1 is proposed to rely on the interaction of the tetratricopeptide repeats (TPRs) of Bub1 and BubR1 with two KI motifs in the outer kinetochore protein Knl1. We determined the crystal structure of the Bub1 TPRs in complex with the cognate Knl1 KI motif and compared it with the structure of the equivalent BubR1TPR-KI motif complex. The interaction developed along the convex surface of the TPR assembly. Point mutations on this surface impaired the interaction of Bub1 and BubR1 with Knl1 in vitro and in vivo but did not cause significant displacement of Bub1 and BubR1 from kinetochores. Conversely, a 62-residue segment of Bub1 that includes a binding domain for the checkpoint protein Bub3 and is C terminal to the TPRs was necessary and largely sufficient for kinetochore recruitment of Bub1. These results shed light on the determinants of kinetochore recruitment of Bub1.


    Organizational Affiliation

    Department of Experimental Oncology, European Institute of Oncology, 20139 Milan, Italy.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MITOTIC CHECKPOINT SERINE/THREONINE-PROTEIN KINASE BUB1
A, B, C, D
152Homo sapiensMutation(s): 0 
Gene Names: BUB1 (BUB1L)
EC: 2.7.11.1
Find proteins for O43683 (Homo sapiens)
Go to Gene View: BUB1
Go to UniProtKB:  O43683
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
PROTEIN CASC5
E, F, G, H
53Homo sapiensMutation(s): 0 
Gene Names: KNL1 (CASC5, KIAA1570)
Find proteins for Q8NG31 (Homo sapiens)
Go to Gene View: KNL1
Go to UniProtKB:  Q8NG31
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.186 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 59.279α = 90.00
b = 130.969β = 110.17
c = 74.956γ = 90.00
Software Package:
Software NamePurpose
SCALAdata scaling
MOSFLMdata reduction
PHASERphasing
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-02-29
    Type: Initial release
  • Version 1.1: 2017-08-09
    Type: Data collection, Source and taxonomy