title: The occurrence of a gene-encoded variant of nuclear basic protein (SP4) in sperm of Xenopus laevis.
abstract: In our recent analyses [1] of five tandemly arranged genes encoding a major sperm-specific basic nuclear protein (SP4) of Xenopus laevis, we found a gene containing a single base substitution which will give rise to the replacement of the 69th residue among the 78 amino acids of SP4. In this study, the polypeptide from sperm nuclei which were separated by reversed-phase HPLC as a distinct entity from SP4 were collected for their peptide mapping with V8 protease and partial amino acid sequence analyses. It resulted that a polypeptide exhibiting an amino acid replacement at exactly the same position as predicted from a single base substitution of SP4 occurs in approximately one-fourth of the amount of SP4. This finding suggests that the relative amount of SP4 and its variant directly depends on the relative number of genes of SP4 and its variant.
authors.affiliation: Department of Biological Science, Faculty of Science, Kumamoto University, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Takamune
authors.forename: K
authors.initials: K
authors.lastname: Teshima
authors.forename: S I
authors.initials: SI
authors.lastname: Abe
authors.forename: C
authors.initials: C
authors.lastname: Katagiri
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D002851:Chromatography, High Pressure Liquid; D014644:Genetic Variation; D008297:Male; D008969:Molecular Sequence Data; D009687:Nuclear Proteins / Q000096:biosynthesis* / Q000737:chemistry / Q000235:genetics; D010446:Peptide Fragments / Q000737:chemistry / Q000302:isolation & purification; D017386:Sequence Homology, Amino Acid; D013094:Spermatozoa / Q000378:metabolism*; D029867:Xenopus Proteins; D014982:Xenopus laevis / Q000235:genetics*
chemical_list: D009687:Nuclear Proteins; D010446:Peptide Fragments; C095601:SP4 protein, Xenopus; C087849:SP5 nuclear protein, Xenopus; D029867:Xenopus Proteins