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Post-translational processing of Drosophila nucleoside diphosphate kinase.

Författare:
Publiceringsår: 2002
Språk: Engelska
Sidor: 689-694
Publikation/Tidskrift/Serie: Biochem Biophys Res Commun
Volym: 295
Nummer: 3
Dokumenttyp: Artikel
Förlag: Academic Press

Sammanfattning

Nucleoside diphosphate kinase (NDPK) was purified from Drosophila melanogaster by a combination of anion-exchange, hydroxyapatite, and reversed-phase chromatography. The identity of the purified enzyme was confirmed by sequencing internal peptides (the N-terminus appeared to be blocked). Post-translational modifications were investigated by using protein chemical and mass spectrometric methods. Analysis by nanoelectrospray ionization-mass spectrometry revealed that the mass of the enzyme was considerably smaller than that predicted from its amino acid sequence. Although its open-reading frame predicts a 153-residue polypeptide, the mature enzyme was found to comprise 152 amino acids, being modified by proteolytic removal of the initiator Met and N-acetylation of Ala2. This explains why the observed pI of the Drosophila enzyme is more acidic than that predicted from its amino acid sequence. No additional post-translational modifications such as glycosylation or O-phosphorylation, which have been identified on homologous NDPKs from other organisms, were detected on the Drosophila enzyme.

Disputation

Nyckelord

  • Medicine and Health Sciences
  • Chemistry
  • Drosophila melanogaster : enzymology
  • Durapatite : pharmacology
  • Glycosylation
  • Nucleoside-Diphosphate Kinase : chemistry
  • Nucleoside-Diphosphate Kinase : isolation & purification
  • Open Reading Frames
  • Peptides : chemistry
  • Phosphorylation
  • Protein Processing
  • Spectrum Analysis
  • Post-Translational
  • Mass
  • Ion Exchange
  • Chromatography
  • Biocompatible Materials : pharmacology
  • Animal

Övriga

Published
Yes
  • ISSN: 0006-291X

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