Crystal structure of the RecA1 domain of RNA helicase CGH-1 in C. elegans

Experimental Data Snapshot

  • Resolution: 1.85 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.174 

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Structural and biochemical insights into the recognition of RNA helicase CGH-1 by CAR-1 in C. elegans.

Zhang, Y.Lv, M.Li, F.Li, M.Zhang, J.Shi, Y.Hong, J.

(2021) Biochem Biophys Res Commun 549: 135-142

  • DOI: https://doi.org/10.1016/j.bbrc.2021.02.119
  • Primary Citation of Related Structures:  
    7DTJ, 7DTK

  • PubMed Abstract: 

    A protein-RNA complex containing the RNA helicase CGH-1 and a germline specific RNA-binding protein CAR-1 is involved in various aspects of function in C. elegans. However, the structural basis for the assembly of this protein complex remains unclear. Here, we elucidate the molecular basis of the recognition of CGH-1 by CAR-1. Additionally, we found that the ATPase activity of CGH-1 is stimulated by NTL-1a MIF4G domain in vitro. Furthermore, we determined the structures of the two RecA-like domains of CGH-1 by X-ray crystallography at resolutions of 1.85 and 2.40 Å, respectively. Structural and biochemical approaches revealed a bipartite interface between CGH-1 RecA2 and the FDF-TFG motif of CAR-1. NMR and structure-based mutations in CGH-1 RecA2 or CAR-1 attenuated or disrupted CGH-1 binding to CAR-1, assessed by ITC and GST-pulldown in vitro. These findings provide insights into a conserved mechanism in the recognition of CGH-1 by CAR-1. Together, our data provide the missing physical links in understanding the assembly and function of CGH-1 and CAR-1 in C. elegans.

  • Organizational Affiliation

    Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui, 230027, PR China; Ministry of Education Key Laboratory for Membraneless Organelles and Cellular Dynamics, University of Science & Technology of China, Hefei, PR China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ATP-dependent RNA helicase cgh-1A [auth B],
B [auth A]
238Caenorhabditis elegansMutation(s): 0 
Gene Names: cgh-1C07H6.5
Find proteins for Q95YF3 (Caenorhabditis elegans)
Explore Q95YF3 
Go to UniProtKB:  Q95YF3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ95YF3
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.85 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.174 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.754α = 95.49
b = 44.091β = 96.32
c = 54.213γ = 100.77
Software Package:
Software NamePurpose
SCALAdata scaling
PDB_EXTRACTdata extraction
HKL-2000data reduction

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China31970669

Revision History  (Full details and data files)

  • Version 1.0: 2021-03-17
    Type: Initial release
  • Version 1.1: 2023-11-29
    Changes: Data collection, Database references, Refinement description