title: UVI31+ is a DNA endonuclease that dynamically localizes to chloroplast pyrenoids in C. reinhardtii.
abstract: UVI31+ is an evolutionarily conserved BolA family protein. In this study we examine the presence, localization and possible functions of this protein in the context of a unicellular alga, Chlamydomonas reinhardtii. UVI31+ in C. reinhardtii exhibits DNA endonuclease activity and is induced upon UV stress. Further, UVI31+ that normally localizes to the cell wall and pyrenoid regions gets redistributed into punctate foci within the whole chloroplast, away from the pyrenoid, upon UV stress. The observed induction upon UV-stress as well as the endonuclease activity suggests plausible role of this protein in DNA repair. We have also observed that UV31+ is induced in C. reinhardtii grown in dark conditions, whereby the protein localization is enhanced in the pyrenoid. Biomolecular interaction between the purified pyrenoids and UVI31+ studied by NMR demonstrates the involvement of the disordered loop domain of the protein in its interaction.
authors.affiliation: Department of Biological Sciences, Tata Institute of Fundamental Research, Colaba, Mumbai, India.
authors.forename: Manish
authors.initials: M
authors.lastname: Shukla
authors.forename: Renu
authors.initials: R
authors.lastname: Minda
authors.forename: Himanshu
authors.initials: H
authors.lastname: Singh
authors.forename: Srikanth
authors.initials: S
authors.lastname: Tirumani
authors.forename: Kandala V R
authors.initials: KV
authors.lastname: Chary
authors.forename: Basuthkar J
authors.initials: BJ
authors.lastname: Rao
mesh_terms: D002473:Cell Wall / Q000378:metabolism; D016825:Chlamydomonas reinhardtii / Q000201:enzymology* / Q000235:genetics / Q000378:metabolism; D002736:Chloroplasts / Q000201:enzymology* / Q000378:metabolism; D003624:Darkness; D003850:Deoxyribonuclease I / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D004789:Enzyme Activation; D018506:Gene Expression Regulation, Plant; D010940:Plant Proteins / Q000378:metabolism*; D054730:Protein Interaction Domains and Motifs; D021381:Protein Transport; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D014466:Ultraviolet Rays
chemical_list: D010940:Plant Proteins; D011994:Recombinant Proteins; D003850:Deoxyribonuclease I