4QH8

LC8 - Ana2 (237-246) Complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.188 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

The Mechanism of Dynein Light Chain LC8-mediated Oligomerization of the Ana2 Centriole Duplication Factor.

Slevin, L.K.Romes, E.M.Dandulakis, M.G.Slep, K.C.

(2014) J Biol Chem 289: 20727-20739

  • DOI: 10.1074/jbc.M114.576041
  • Primary Citation of Related Structures:  
    4QH7, 4QH8

  • PubMed Abstract: 
  • Centrioles play a key role in nucleating polarized microtubule networks. In actively dividing cells, centrioles establish the bipolar mitotic spindle and are essential for genomic stability. Drosophila anastral spindle-2 (Ana2) is a conserved centriole duplication factor ...

    Centrioles play a key role in nucleating polarized microtubule networks. In actively dividing cells, centrioles establish the bipolar mitotic spindle and are essential for genomic stability. Drosophila anastral spindle-2 (Ana2) is a conserved centriole duplication factor. Although recent work has demonstrated that an Ana2-dynein light chain (LC8) centriolar complex is critical for proper spindle positioning in neuroblasts, how Ana2 and LC8 interact is yet to be established. Here we examine the Ana2-LC8 interaction and map two LC8-binding sites within the central region of Ana2, Ana2M (residues 156-251). Ana2 LC8-binding site 1 contains a signature TQT motif and robustly binds LC8 (KD of 1.1 μm), whereas site 2 contains a TQC motif and binds LC8 with lower affinity (KD of 13 μm). Both LC8-binding sites flank a predicted ~34-residue α-helix. We present two independent atomic structures of LC8 dimers in complex with Ana2 LC8-binding site 1 and site 2 peptides. The Ana2 peptides form β-strands that extend a central composite LC8 β-sandwich. LC8 recognizes the signature TQT motif in the first LC8 binding site of Ana2, forming extensive van der Waals contacts and hydrogen bonding with the peptide, whereas the Ana2 site 2 TQC motif forms a uniquely extended β-strand, not observed in other dynein light chain-target complexes. Size exclusion chromatography coupled with multiangle static light scattering demonstrates that LC8 dimers bind Ana2M sites and induce Ana2 tetramerization, yielding an Ana2M4-LC88 complex. LC8-mediated Ana2 oligomerization probably enhances Ana2 avidity for centriole-binding factors and may bridge multiple factors as required during spindle positioning and centriole biogenesis.


    Organizational Affiliation

    From the Departments of Biology and kslep@bio.unc.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Dynein light chain 1, cytoplasmicA, B, E, F, G, H94Drosophila melanogasterMutation(s): 0 
Gene Names: ctpCdlc1ddlc1CG6998
UniProt
Find proteins for Q24117 (Drosophila melanogaster)
Explore Q24117 
Go to UniProtKB:  Q24117
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Anastral spindle 2C13Drosophila melanogasterMutation(s): 0 
Gene Names: ana2Ana-2Ana2BcDNA:LD22033Dmel\CG8262STILCG8262Dmel_CG8262
UniProt
Find proteins for Q9XZ31 (Drosophila melanogaster)
Explore Q9XZ31 
Go to UniProtKB:  Q9XZ31
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Anastral spindle 2D12Drosophila melanogasterMutation(s): 0 
Gene Names: ana2Ana-2Ana2BcDNA:LD22033Dmel\CG8262STILCG8262Dmel_CG8262
UniProt
Find proteins for Q9XZ31 (Drosophila melanogaster)
Explore Q9XZ31 
Go to UniProtKB:  Q9XZ31
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.188 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 36.627α = 99.33
b = 44.802β = 103.04
c = 85.895γ = 91.79
Software Package:
Software NamePurpose
SERGUIdata collection
PHENIXmodel building
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHENIXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-06-11
    Type: Initial release
  • Version 1.1: 2014-08-20
    Changes: Database references