title: Distinct C-terminal sequences of isozymes I and II of the human erythrocyte L-isoaspartyl/D-aspartyl protein methyltransferase.
abstract: We have purified the more acidic major isozyme (II) of the human erythrocyte L-isoaspartyl/D-aspartyl methyltransferase and compared its structure to that of the previously sequenced isozyme I. These isozymes are both monomers of 25,000 molecular weight polypeptides and have similar enzymatic properties, but have isoelectric points that differ by one pH unit. Analysis of 16 tryptic peptides of isozyme II accounting for 89% of the sequence of isozyme I revealed no differences between these enzyme forms. However, analysis of a Staphylococcal V8 protease C-terminal fragment revealed that the last two residues of these proteins differed. The Trp-Lys-COOH terminus of isozyme I is replaced by a Asp-Asp-COOH terminus in isozyme II. Southern blot analysis of genomic DNA suggests that the human genome [corrected] may contain only a single gene encoding the enzyme. We propose that the distinct C-termini of isozymes I and II can arise from the generation of multiple mRNA's by alternative splicing.
authors.affiliation: Department of Chemistry and Biochemistry, University of California, Los Angeles 90024-1569.
authors.forename: D
authors.initials: D
authors.lastname: Ingrosso
authors.forename: R M
authors.initials: RM
authors.lastname: Kagan
authors.forename: S
authors.initials: S
authors.lastname: Clarke
mesh_terms: D000595:Amino Acid Sequence; D004912:Erythrocytes / Q000201:enzymology*; D006801:Humans; D007527:Isoenzymes / Q000097:blood* / Q000235:genetics / Q000302:isolation & purification; D008969:Molecular Sequence Data; D010446:Peptide Fragments / Q000302:isolation & purification; D026601:Protein D-Aspartate-L-Isoaspartate Methyltransferase; D011496:Protein Methyltransferases / Q000097:blood* / Q000235:genetics / Q000302:isolation & purification; D012689:Sequence Homology, Nucleic Acid; D014357:Trypsin
chemical_list: D007527:Isoenzymes; D010446:Peptide Fragments; D011496:Protein Methyltransferases; D026601:Protein D-Aspartate-L-Isoaspartate Methyltransferase; D014357:Trypsin