Abstract:
:The fibrous sheath is a major cytoskeletal structure in the principal piece of the mammalian sperm flagellum. Two peptide sequences obtained from a tryptic digest of mouse fibrous sheath proteins exhibited high homology with mu-class glutathione S-transferases (GSTs). Using a DNA probe amplified from degenerate polymerase chain reaction (PCR) primers predicted from these two peptide sequences, a approximately 1.1 kb cDNA clone for fibrous sheath component 2 (Fsc2) was isolated which had 84% nucleic acid and 89% amino acid sequence identity with a previously reported mu-class human GST gene (hGSTM3; Campbell et al., 1990: J Biol Chem 265:4188-9193). Sequences corresponding to those of the two fibrous sheath peptides were present in the protein encoded by the Fsc2 cDNA. Northern analysis with the full length Fsc2 cDNA detected a approximately 1.1 kb mRNA in 12 of 15 somatic tissues examined, as well as in testis and isolated spermatogenic cells. However, 5'(nt--96 to 12) or 3'(nt 637 to 808) Fsc2 probes, containing mostly noncoding sequences, detected a approximately 1.1 kb mRNA abundant in testis and isolated spermatogenic cells, but absent or present at low levels in somatic tissues. Northern analysis with RNA from testes of mice of different postnatal ages and purified spermatogenic cell populations indicated that this transcript is first present during the meiotic phase of germ cell development. These results suggest that a previously unreported mu-class GST gene (mGSTM5.) is expressed at a specific time during the development of spermatogenic cells in the mouse. Immunoblot analysis indicated that a mu-class GST protein is associated with the fibrous sheath, suggesting that it becomes an integral part of the mouse sperm cytoskeleton.
journal_name
Mol Reprod Devjournal_title
Molecular reproduction and developmentauthors
Fulcher KD,Welch JE,Klapper DG,O'Brien DA,Eddy EMdoi
10.1002/mrd.1080420407subject
Has Abstractpub_date
1995-12-01 00:00:00pages
415-24issue
4eissn
1040-452Xissn
1098-2795journal_volume
42pub_type
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