title: Cloning and characterization of a human orthologue of testis-specific succinyl CoA: 3-oxo acid CoA transferase (Scot-t) cDNA.
abstract: Succinyl CoA: 3-oxo acid CoA transferase (scot; EC 2.8.3.5) is a key enzyme for metabolism of ketone bodies. Previously, we have cloned a testis-specific succinyl CoA: 3-oxo acid CoA transferase (scot-t) cDNA from a subtracted cDNA library of mouse testis and demonstrated its expression to be specific to late haploid male germ cells. In this study, the human orthologue of mouse scot-t was cloned and characterized. The entire coding region of the mRNA and the deduced amino acid sequence of human Scot-t (h-Scot-t) showed 75.4 and 75.8% identity with mouse scot-t respectively. The mRNA was exclusively expressed in the testis, and the protein was localized to the midpiece of ejaculated spermatozoa where mitochondria exist. We showed that the h-Scot-t gene was intronless by using a polymerase chain reaction technique and that a non-functional pseudogene, 98% similar to h-Scot-t, was also located on the human genome (1p33-34.3). Furthermore, the genomic structure of the actual h-Scot-t transcription unit was found to be located in an intron (1p34.1-35.3) of the bone morphogenetic protein 8 (BMP8) gene. In conclusion, we have demonstrated that h-Scot-t is a single intronless gene specifically expressed in the testis.
authors.affiliation: Department of Science for Laboratory Animal Experimentation, Research Institute for Microbial Diseases, Osaka University,3-1 Yamadaoka, Suita City, Osaka 565-0871, Japan.
authors.forename: Hiromitsu
authors.initials: H
authors.lastname: Tanaka
authors.forename: Junya
authors.initials: J
authors.lastname: Kohroki
authors.forename: Naoko
authors.initials: N
authors.lastname: Iguchi
authors.forename: Masayoshi
authors.initials: M
authors.lastname: Onishi
authors.forename: Yoshitake
authors.initials: Y
authors.lastname: Nishimune
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D003001:Cloning, Molecular; D015256:Coenzyme A-Transferases / Q000737:chemistry / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism*; D006801:Humans; D008297:Male; D051379:Mice; D008969:Molecular Sequence Data; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D016415:Sequence Alignment; D013094:Spermatozoa / Q000166:cytology / Q000201:enzymology; D013737:Testis / Q000201:enzymology*; D014018:Tissue Distribution
chemical_list: D011993:Recombinant Fusion Proteins; D015256:Coenzyme A-Transferases; C021460:3-ketoacid CoA-transferase