Molecular machines encoded by bacterially-derived multi-domain gene fusions that potentially synthesize, N-methylate and transfer long chain polyamines in diatoms

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22 Scopus citations

Abstract

Silica glass formation in diatoms requires the biosynthesis of unusual, very long chain polyamines (LCPA) composed of iterated aminopropyl units. Diatoms processively synthesize LCPA, N-methylate the amine groups and transfer concatenated, N-dimethylated aminopropyl groups to silaffin proteins. Here I show that diatom genomes possess signal peptide-containing gene fusions of bacterially-derived polyamine biosynthetic enzymes S-adenosylmethionine decarboxylase (AdoMetDC) and an aminopropyltransferase, sometimes fused to a eukaryotic histone N-methyltransferase domain, that potentially synthesize and N-methylate LCPA. Fusions of similar, alternatively configured domains but with a catalytically dead AdoMetDC and in one case a Tudor domain, may N-dimethylate and transfer multiple aminopropyl unit polyamines onto silaffin proteins.

Original languageEnglish (US)
Pages (from-to)2627-2634
Number of pages8
JournalFEBS Letters
Volume585
Issue number17
DOIs
StatePublished - Sep 2 2011

Keywords

  • Aminopropyltransferase
  • Biosilica glass
  • Diatom
  • Long chain polyamine biosynthesis
  • N-methylation

ASJC Scopus subject areas

  • Biophysics
  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Genetics
  • Cell Biology

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