The Candida albicans Kar2 protein is essential and functions during the translocation of proteins into the endoplasmic reticulum.

Curr Genet 2011 Feb 1;57(1):25-37. Epub 2010 Oct 1.

Biology Department, The University of Montana Western, Dillon, MT 59725, USA.

Since the secretory pathway is essential for Candida albicans to transition from a commensal organism to a pathogen, an understanding of how this pathway functions may be beneficial for identifying novel drug targets to prevent candidiasis. We have cloned the C. albicans KAR2 gene, which performs many roles during the translocation of proteins into the endoplasmic reticulum (ER) during the first committed step of the secretory pathway in many eukaryotes. Our results show that C. albicans KAR2 is essential, and that the encoded protein rescues a temperature-sensitive growth defect found in a Saccharomyces cerevisiae strain harboring a mutant form of the Kar2 protein. Additionally, S. cerevisiae containing CaKAR2 as the sole copy of this essential gene are viable, and ER microsomes prepared from this strain exhibit wild-type levels of post-translational translocation during in vitro translocation assays. Finally, ER microsomes isolated from a C. albicans strain expressing reduced amounts of KAR2 mRNA are defective for in vitro translocation of a secreted substrate protein, establishing a new method to study ER translocation in this organism. Together, these results suggest that C. albicans Kar2p functions during the translocation of proteins into the ER during the first step of the secretory pathway.

Download full-text PDF

Source
http://dx.doi.org/10.1007/s00294-010-0323-1DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3327301PMC
February 2011
4 Reads

Publication Analysis

Top Keywords

albicans kar2
12
secretory pathway
12
translocation proteins
12
functions translocation
8
proteins endoplasmic
8
vitro translocation
8
endoplasmic reticulum
8
step secretory
8
kar2 protein
8
candida albicans
8
translocation
7
kar2
5
albicans
5
saccharomyces cerevisiae
4
growth defect
4
temperature-sensitive growth
4
cerevisiae strain
4
defect saccharomyces
4
strain harboring
4
form kar2
4

Similar Publications