Format

Send to

Choose Destination
J Proteomics. 2013 Jan 14;78:294-311. doi: 10.1016/j.jprot.2012.09.036. Epub 2012 Oct 9.

Co-expression analysis, proteomic and metabolomic study on the impact of a Deg/HtrA protease triple mutant in Synechocystis sp. PCC 6803 exposed to temperature and high light stress.

Author information

1
Dept. of Chemistry, Umeå Plant Science Centre, Umeå University, 90187 Umeå, Sweden.

Abstract

Members of the DegP/HtrA protease family are widespread in nature and play an important role in proteolysis of misfolded and damaged proteins. The cyanobacterium Synechocystis sp. PCC 6803 contains three Deg proteases, HhoA (Sll1679), HhoB (Sll1427) and HtrA (Slr1204). Using the proteomic or metabolomic approach we investigated a triple deletion mutant (Δdeg) exposed to light or temperature stress. To cope with the stress conditions the triple mutant reduces its energy metabolism and stress-related proteins are induced to protect the cells. Additionally the co-expression of the genes encoding the three proteases with other genes in Synechocystis sp. PCC 6803 was analyzed. While HhoA seems to be involved in house-keeping processes related to protein (re)folding, protein clearance and signaling, the hhoB expression cluster is dominated by genes encoding periplasmic proteins linked to metabolism or signal transduction pathways. The htrA expression pattern is similar to that of genes encoding proteins of the electron transport chain, iron- and nitrogen metabolism. Our integrative approach indicates significant rearrangements in cells depleted of the Deg/HtrA proteases when exposed to stress, both, in the cytoplasmic and extracytoplasmic space.

PMID:
23063787
DOI:
10.1016/j.jprot.2012.09.036
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center