Abstract:
:Phosphorylations catalyzed by cAMP-dependent protein kinase are essential for sperm motility, and type II cAMP-dependent protein kinase in mature sperm has been shown to be firmly bound to the flagellum via the regulatory subunit, RII. The present study documents high-levelled expression of a human, testis-specific RII alpha mRNA (2.0 kb) analogous to the rat mRNA which is induced in haploid germ cells [(1988) FEBS Lett. 229, 391-394]. We report the molecular cloning of a full-length human cDNA corresponding to this unique testis mRNA, and the presence of an alternative amino-terminal region (amino acids 45-75) of the predicted RII alpha protein (404 amino acids) compared with the previously published mouse and rat sequences. However, this alternate region is also shown to be present in RII alpha mRNA (7.0 kb) of human somatic cells. Our data indicate the divergent amino-terminal sequence to be due to species differences, suggesting an active evolutionary pressure on this particular region, which could be involved in subcellular attachment of RII alpha and thereby localization of kinase activity to certain targets within the cell.
journal_name
FEBS Lettjournal_title
FEBS lettersauthors
Oyen O,Myklebust F,Scott JD,Hansson V,Jahnsen Tdoi
10.1016/0014-5793(89)80253-4subject
Has Abstractpub_date
1989-03-27 00:00:00pages
57-64issue
1-2eissn
0014-5793issn
1873-3468pii
0014-5793(89)80253-4journal_volume
246pub_type
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