The developmentally regulated Aspergillus nidulans wA gene encodes a polypeptide homologous to polyketide and fatty acid synthases

Mol Gen Genet. 1992 Nov;235(2-3):205-12. doi: 10.1007/BF00279362.


The Aspergillus nidulans wA gene is required for synthesis of a green pigment present in the walls of mature asexual spores (conidia); wA mutants produce colorless (white) conidia. We determined the transcriptional structure and DNA sequence of the wA gene. wA consists of 5 exons separated by short (40-60 bp) introns. The processed transcript has the potential to encode a protein consisting of 1986 amino acid residues. The predicted WA polypeptide showed extensive sequence similarities with bacterial and fungal polyketide synthases and vertebrate fatty acid synthases, particularly within conserved active sites. Properties of the yellow conidial wall pigment intermediate suggest that it is a polyketide rather than a fatty acid. It is therefore likely that wA encodes all or part of a polyketide synthase involved in the formation of this pigment intermediate.

Publication types

  • Comparative Study
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Amino Acid Sequence
  • Aspergillus nidulans / genetics*
  • Aspergillus nidulans / physiology
  • Base Sequence
  • DNA, Fungal / genetics
  • Fatty Acid Synthases / genetics*
  • Fungal Proteins / genetics*
  • Genes, Fungal*
  • Molecular Sequence Data
  • Multienzyme Complexes / genetics*
  • Restriction Mapping
  • Sequence Homology, Amino Acid
  • Software
  • Spores, Fungal / physiology
  • Transcription, Genetic


  • DNA, Fungal
  • Fungal Proteins
  • Multienzyme Complexes
  • Fatty Acid Synthases

Associated data

  • GENBANK/X65866