Assembly of AKAP82, a protein kinase A anchor protein, into the fibrous sheath of mouse sperm

Developmental Biology
L R JohnsonG L Gerton

Abstract

The assembly of the mammalian sperm flagellum is a complex developmental event requiring the sequential activation of genes encoding the component parts and the coordinated assembly of these proteins during the differentiation of the haploid spermatid. In this study, the mechanism underlying the assembly of the fibrous sheath surrounding the axoneme was examined. The subject of the study was the major fibrous sheath protein of the mouse sperm flagellum, AKAP82, a member of the A Kinase Anchor Protein (AKAP) family of polypeptides that bind the regulatory (RII) subunit of protein kinase A (PK-A). Immunoelectron microscopy demonstrated that AKAP82 is present throughout the transverse ribs and longitudinal columns of the fibrous sheath. Since AKAP82 is initially synthesized as a precursor (pro-AKAP82) during spermiogenesis, an antiserum was raised against a peptide from the processed region of pro-AKAP82 (M(r) 97,000). In immunoblotting experiments, the antibody detected pro-AKAP82 in condensing spermatids but not in epididymal sperm. In addition, two other immunoreactive proteins of M(r) 109,000 (p109) and M(r) 26,000 (p26, representing the "pro" domain of the precursor) were present in epididymal sperm. Alkaline phosphatase trea...Continue Reading

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