Coccidioides posadasii contains a single 1,3-β-glucan synthase gene that appears to be essential for growth

Ellen M. Kellner, Kris I. Orsborn, Erin M. Siegel, M. Alejandra Mandel, Marc J. Orbach, John N. Galgiani

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


1,3-β-Glucan synthase is responsible for the synthesis of β-glucan, an essential cell wall structural component in most fungi. We sought to determine whether Coccidioides posadasii possesses genes homologous to known fungal FKS genes that encode the catalytic subunit of 1,3-β-glucan synthase. A single gene, designated FKS1, was identified, and examination of its predicted protein product showed a high degree of conservation with Fks proteins from other filamentous fungi. FKS1 is expressed at similar levels in mycelia and early spherulating cultures, and expression decreases as the spherules mature. We used Agrobacterium-mediated transformation to create strains that harbor ΔFKS1::hygB, a null allele of FKS1, and hypothesize that Fks1p function is essential, due to our inability to purify this allele away from a complementing wild-type FKS1 allele in a heterokaryotic strain. The heterokaryon appears normal with respect to growth rate and arthroconidium production; however, microscopic examination of strains with ΔFKS1::hygB alleles revealed abnormal swelling of hyphal elements.

Original languageEnglish (US)
Pages (from-to)111-120
Number of pages10
JournalEukaryotic Cell
Issue number1
StatePublished - Jan 2005

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology


Dive into the research topics of 'Coccidioides posadasii contains a single 1,3-β-glucan synthase gene that appears to be essential for growth'. Together they form a unique fingerprint.

Cite this