The two Dps proteins, NpDps2 and NpDps5, are involved in light-induced oxidative stress tolerance in the N

Moparthi VK, Li X, Vavitsas K, Dzhygyr I, Sandh G, Magnuson A, Stensjö K

Biochim. Biophys. Acta 1857 (11) 1766-1776 [2016-11-00; online 2016-08-12]

Cyanobacteria are photosynthetic prokaryotes that are considered biotechnologically prominent organisms for production of high-value compounds. Cyanobacteria are subject to high-light intensities, which is a challenge that needs to be addressed in design of efficient bio-engineered photosynthetic organisms. Dps proteins are members of the ferritin superfamily and are omnipresent in prokaryotes. They play a major role in oxidative stress protection and iron homeostasis. The filamentous, heterocyst-forming Nostoc punctiforme, has five Dps proteins. In this study we elucidated the role of these Dps proteins in acclimation to high light intensity, the gene loci organization and the transcriptional regulation of all five dps genes in N. punctiforme was revealed, and dps-deletion mutant strains were used in physiological characterization. Two mutants defective in Dps2 and Dps5 activity displayed a reduced fitness under increased illumination, as well as a differential Photosystem (PS) stoichiometry, with an elevated Photosystem II to Photosystem I ratio in the dps5 deletion strain. This work establishes a Dps-mediated link between light tolerance, H

Affiliated researcher

PubMed 27528559

DOI 10.1016/j.bbabio.2016.08.003

Crossref 10.1016/j.bbabio.2016.08.003

pii: S0005-2728(16)30594-1