Send to

Choose Destination
Mol Microbiol. 2006 Nov;62(4):1090-101. Epub 2006 Oct 16.

The Hsp70 member, Ssa1, acts as a DNA-binding transcriptional co-activator of laccase in Cryptococcus neoformans.

Author information

Section of Infectious Diseases, Department of Medicine, University of Illinois at Chicago College of Medicine, Chicago, IL, USA.


Hsp70 proteins are a well-known class of chaperones that have also been described to have roles in cellular regulation. Here, we show that a Cryptococcus neoformans Hsp70 homologue Ssa1 acts as a DNA-binding transcriptional co-activator of the fungal virulence factor, laccase, via binding to a GC-rich element within the 5'-UAS in response to glucose starvation, iron, copper, calcium and temperature. In addition, Ssa1 forms a regulatory complex with heat shock transcription factor and TATA-binding protein during laccase induction. Furthermore, deletion of Ssa1 results in reduced laccase and attenuated virulence using a mouse model. These results indicate that Hsp70 functions as a stress-related transcriptional co-activator required for fungal virulence.

[Indexed for MEDLINE]
Free full text

Supplemental Content

Full text links

Icon for Wiley
Loading ...
Support Center