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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Translation and assembly of CABYR coding region B in fibrous sheath and restriction of calcium binding to coding region A.

CABYR is a highly polymorphic, sperm flagellar calcium-binding protein that is tyrosine as well as serine/threonine phosphorylated during capacitation. Six alternative splice variants of human CABYR (I-VI) have previously been identified, involving two coding regions, CR-A and CR-B, separated by an intervening stop codon. It is presently unknown if proteins encoded by the predicted coding region B of CABYR are translated during spermiogenesis, where they localize, or which CABYR isoforms bind calcium. Immunofluorescent and electron microscopic studies using polyclonal antibodies generated to the recombinant c-terminal 198 aa CABYR-B localized the isoforms containing CABYR-B to the ribs and longitudinal columns of the fibrous sheath in the principal piece of the flagellum. Antisera to recombinant CABYR-A and CABYR-B proteins recognized distinct populations of CABYR isoforms encoded by either CR-A alone and/or CR-B as well as a common population of CABYR isoforms. Only the recombinant CABYR-A and not the CABYR-B bound calcium in vitro, which is consistent with the hypothesis that CABYR-A is the only form that binds calcium in sperm. These observations confirmed that, despite the presence of the stop codon in CR-A, splice variants containing CR-B are expressed during spermiogenesis and assemble into the fibrous sheath of the principal piece; however, calcium binding occurs only to those CABYR isoforms containing CABYR-A.[1]


  1. Translation and assembly of CABYR coding region B in fibrous sheath and restriction of calcium binding to coding region A. Kim, Y.H., Jha, K.N., Mandal, A., Vanage, G., Farris, E., Snow, P.L., Klotz, K., Naaby-Hansen, S., Flickinger, C.J., Herr, J.C. Dev. Biol. (2005) [Pubmed]
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