Crystal structure of Marf1 Lotus domain from Mus musculus

Experimental Data Snapshot

  • Resolution: 1.76 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.182 

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Ribonuclease activity of MARF1 controls oocyte RNA homeostasis and genome integrity in mice.

Yao, Q.Cao, G.Li, M.Wu, B.Zhang, X.Zhang, T.Guo, J.Yin, H.Shi, L.Chen, J.Yu, X.Zheng, L.Ma, J.Su, Y.Q.

(2018) Proc Natl Acad Sci U S A 115: 11250-11255

  • DOI: https://doi.org/10.1073/pnas.1809744115
  • Primary Citation of Related Structures:  
    5YAA, 5YAD

  • PubMed Abstract: 

    Producing normal eggs for fertilization and species propagation requires completion of meiosis and protection of the genome from the ravages of retrotransposons. Mutation of Marf1 (meiosis regulator and mRNA stability factor 1) results in defects in both these key processes in mouse oocytes and thus in infertility. MARF1 was predicted to have ribonuclease activity, but the structural basis for the function of MARF1 and the contribution of its putative ribonuclease domain to the mutant oocyte phenotype was unknown. Therefore, we resolved the crystal structures of key domains of MARF1 and demonstrated by biochemical and mutagenic analyses that the ribonuclease activity of MARF1 controls oocyte meiotic progression and retrotransposon surveillance. The N-terminal NYN domain of MARF1 resembles the nuclease domains of Vpa0982, T4 RNase H, and MCPIP1 and contains four conserved aspartate residues, D178, D215, D246, and D272. The C-terminal LOTUS domain of MARF1 adopts a winged helix-turn-helix fold and binds ssRNA and dsRNA. Purified MARF1 cleaved ssRNAs in vitro, but this cleavage activity was abolished by mutations of conserved aspartates in its NYN domain and truncation of the LOTUS domain. Furthermore, a point mutation in the D272 residue in vivo caused a female-only infertile phenotype in mice, with failure of meiotic resumption and elevation of Line1 and Iap retrotransposon transcripts and DNA double-strand breaks in oocytes. Therefore, the ribonuclease activity of MARF1 controls oocyte meiosis and genome integrity. This activity depends upon conserved aspartic residues in the catalytic NYN domain and the RNA-binding activity of the LOTUS domain.

  • Organizational Affiliation

    State Key Laboratory of Genetic Engineering, Department of Biochemistry, School of Life Sciences, Fudan University, 200438 Shanghai, Peoples' Republic of China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Meiosis regulator and mRNA stability factor 1
A, B
75Mus musculusMutation(s): 0 
Gene Names: Marf1Kiaa0430Lkap
Find proteins for Q8BJ34 (Mus musculus)
Explore Q8BJ34 
Go to UniProtKB:  Q8BJ34
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8BJ34
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.76 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.182 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.974α = 90
b = 53.959β = 90
c = 67.45γ = 90
Software Package:
Software NamePurpose
HKL-3000data reduction
HKL-3000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-10-03
    Type: Initial release
  • Version 1.1: 2018-11-14
    Changes: Data collection, Database references