Association of calcineurin with the COPI protein Sec28 and the COPII protein Sec13 revealed by quantitative proteomics.

Journal Article

Calcineurin is a calcium-calmodulin-dependent serine/threonine specific protein phosphatase operating in key cellular processes governing responses to extracellular cues. Calcineurin is essential for growth at high temperature and virulence of the human fungal pathogen Cryptococcus neoformans but the underlying mechanism is unknown. We performed a mass spectrometry analysis to identify proteins that associate with the calcineurin A catalytic subunit (Cna1) in C. neoformans cells grown under non-stress and high temperature stress conditions. A novel prioritization strategy for mass spectrometry data from immunoprecipitation experiments identified putative substrates and proteins potentially operating with calcineurin in common pathways. Cna1 co-purified with proteins involved in membrane trafficking including the COPI component Sec28 and the COPII component Sec13. The association of Cna1 with Sec28 and Sec13 was confirmed by co-immunoprecipitation. Cna1 exhibited a dramatic change in subcellular localization during high temperature stress from diffuse cytoplasmic to ER-associated puncta and the mother-bud neck and co-localized with Sec28 and Sec13.

Full Text

Duke Authors

Cited Authors

  • Kozubowski, L; Thompson, JW; Cardenas, ME; Moseley, MA; Heitman, J

Published Date

  • 2011

Published In

Volume / Issue

  • 6 / 10

Start / End Page

  • e25280 -

PubMed ID

  • 21984910

Pubmed Central ID

  • 21984910

Electronic International Standard Serial Number (EISSN)

  • 1932-6203

Digital Object Identifier (DOI)

  • 10.1371/journal.pone.0025280


  • eng

Conference Location

  • United States