title: Expression of a novel T-complex testis expressed 5 (Tctex5) in mouse testis, epididymis, and spermatozoa.
abstract: Expression of T-complex testis expressed 5 (Tctex5), an orthologue of protein phosphatase-1 inhibitor-3 (PPP1R11), was enhanced in mouse testis and was also expressed in epididymis and spermatozoa. There were three transcripts of Tctex5 including one brain specific and two common transcripts dominant in mouse testis. Tctex5 protein isoforms (75, 52, 32, 25, and 14.3 kDa) were identified. Isoforms of 75 and 52 kDa were spermatogenic-specific and were found in protein fraction containing nuclei, mitochondria, and flagellum accessory, and also in protein fraction containing mainly membranes. Tctex5 was localized in nuclei of pachytene spermatocytes, round spermatocytes, cytoplasm of Sertoli cells in testis; cilia, secretion bodies and nuclei of epithelial cells and interstitium smooth muscle cells in epididymis; and head and principal piece of tail in epididymal spermatozoa. The results suggested that Tctex5 might be a specific protein phosphatase-1 inhibitor in sperm; various Tctex5 transcripts and isoforms and cellular locations imply its different roles in spermatogenesis. Nuclei-type isoforms (75 and 52 kDa) might take part in nucleus remodeling during spermatogenesis whilst membrane-type isoform (52 kDa) might be responsible for dephosphorylation of proteins during capacitation. The other isoforms might play general roles for all kinds of cell types.
authors.affiliation: Department of Obstetrics and Gynaecology, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong, SAR, China. ybhan@cuhk.edu.hk
authors.forename: Y B
authors.initials: YB
authors.lastname: Han
authors.forename: H L
authors.initials: HL
authors.lastname: Feng
authors.forename: C K
authors.initials: CK
authors.lastname: Cheung
authors.forename: P M
authors.initials: PM
authors.lastname: Lam
authors.forename: C C
authors.initials: CC
authors.lastname: Wang
authors.forename: C J
authors.initials: CJ
authors.lastname: Haines
mesh_terms: D000818:Animals; D002467:Cell Nucleus / Q000737:chemistry / Q000378:metabolism; D004822:Epididymis / Q000737:chemistry / Q000378:metabolism*; D008297:Male; D051379:Mice; D008869:Microtubule-Associated Proteins / Q000032:analysis / Q000235:genetics / Q000378:metabolism*; D009687:Nuclear Proteins / Q000032:analysis / Q000235:genetics / Q000378:metabolism*; D010749:Phosphoprotein Phosphatases / Q000037:antagonists & inhibitors; D020033:Protein Isoforms / Q000032:analysis / Q000235:genetics / Q000378:metabolism; D054645:Protein Phosphatase 1; D013075:Sperm Capacitation; D013094:Spermatozoa / Q000737:chemistry / Q000378:metabolism*; D013737:Testis / Q000737:chemistry / Q000378:metabolism*; D014158:Transcription, Genetic; D044767:Ubiquitin-Protein Ligases; D056427:t-Complex Genome Region
chemical_list: D008869:Microtubule-Associated Proteins; D009687:Nuclear Proteins; D020033:Protein Isoforms; C533391:Ppp1r11 protein, mouse; D044767:Ubiquitin-Protein Ligases; D010749:Phosphoprotein Phosphatases; D054645:Protein Phosphatase 1