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Testis-specific serine/threonine protein kinase 4 (Tssk4) phosphorylates Odf2 at Ser-76

Xiaoli Wang1, Han Li1,2, Guolong Fu3

  • 1Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, School of Pharmaceutical Sciences, and Medical Research Institute, Wuhan University, Wuhan, 430072, P.R.China.

Scientific Reports
|March 11, 2016
PubMed

Insights

Testis-specific serine/threonine protein kinase 4 (Tssk4) phosphorylates Odf2 at serine 76. This finding provides crucial insights into Tssk4

Area of Science:

  • Reproductive Biology
  • Molecular Cell Biology
  • Biochemistry

Background:

  • Tssk4 is a testis-specific kinase crucial for male fertility.
  • Tssk4 associates with and phosphorylates Odf2, but the specific site was unknown.

Purpose of the Study:

  • To identify the specific phosphorylation site on Odf2 targeted by Tssk4.
  • To elucidate the functional implications of Tssk4-mediated Odf2 phosphorylation in male fertility.

Main Methods:

  • Site-directed mutagenesis of Odf2 to generate point mutants (Ser/Thr/Lys to Ala).
  • Confirmation of Tssk4-Odf2 interaction domain (C-terminal region, amino acids 214-638).
  • In vivo analysis of phosphorylated Odf2 in mouse sperm using phospho-specific antibodies and LC-MS/MS.

Main Results:

  • The C-terminal region of Odf2 (amino acids 214-638) is necessary for Tssk4 association.
  • Serine 76 of Odf2 was identified as a key phosphorylation site by Tssk4.
  • Phosphorylated Odf2 was detected in mouse sperm, confirming in vivo relevance.

Conclusions:

  • This study identifies Serine 76 as a Tssk4 phosphorylation site on Odf2.
  • These findings offer critical insights into Tssk4's role in regulating sperm function and male fertility.

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