4QH7 | pdb_00004qh7

LC8 - Ana2 (159-168) Complex

• PDB DOI: https://doi.org/10.2210/pdb4QH7/pdb

• Classification: MOTOR PROTEIN
• Organism(s): Drosophila melanogaster
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2014-05-27 Released: 2014-06-11 
• Deposition Author(s): Slevin, L.K., Romes, E.R., Slep, K.C.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.83 Å
• R-Value Free: 
  0.207 (Depositor), 0.209 (DCC) 
• R-Value Work: 
  0.176 (Depositor), 0.178 (DCC) 
• R-Value Observed: 
  0.178 (Depositor) 

Starting Model: experimental

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 Biological Chem 289: 20727-20739

• PubMed: 24920673 
• DOI: https://doi.org/10.1074/jbc.M114.576041
• Primary Citation 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. 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.
Biochemistry and Biophysics, University of North Carolina, Chapel Hill, North Carolina 27599.
From the Departments of Biology and [e-mail].

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Hetero 4-mer - A2B2 Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 4-mer - A2B1C1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly 2  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Hetero 4-mer - A2B2 Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 4-mer - A2B1C1 

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content 

• Total Structure Weight: 48.33 kDa 
• Atom Count: 3,356 
• Modeled Residue Count: 376 
• Deposited Residue Count: 424 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Dynein light chain 1, cytoplasmic	A, B, E, F	94	Drosophila melanogaster	Mutation(s): 0  Gene Names: ctp, Cdlc1, ddlc1, CG6998
UniProt
Find proteins for Q24117 (Drosophila melanogaster) Explore Q24117  Go to UniProtKB:  Q24117

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Anastral spindle 2	C, D, G, H	12	Drosophila melanogaster	Mutation(s): 0
UniProt
Find proteins for Q9XZ31 (Drosophila melanogaster) Explore Q9XZ31  Go to UniProtKB:  Q9XZ31

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.83 Å
• R-Value Free:  0.207 (Depositor), 0.209 (DCC) 
• R-Value Work:  0.176 (Depositor), 0.178 (DCC) 
• R-Value Observed: 0.178 (Depositor) 

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 51.453	α = 90
b = 77.913	β = 90
c = 108.891	γ = 90

Software Package:

Software Name	Purpose
SERGUI	data collection
PHENIX	model building
PHENIX	refinement
HKL-2000	data reduction
HKL-2000	data scaling
PHENIX	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2014-06-11 
Deposition Author(s): Slevin, L.K., Romes, E.R., Slep, K.C.

Revision History  

• Version 1.0: 2014-06-11
  Type: Initial release
  
• Version 1.1: 2014-08-20
  Changes: Database references
• Version 1.2: 2023-09-20
  Changes: Data collection, Database references, Refinement description