Overexpression of Arabidopsis damaged DNA binding protein 1A (DDB1A) enhances UV tolerance.
Damaged DNA Binding protein 1 (DDB1) is a conserved protein and a component of multiple cellular complexes. Arabidopsis has two homologues of DDB1: DDB1A and DDB1B. In this study we examine the role of DDB1A in Arabidopsis UV tolerance and DNA repair using a DDB1A null mutant (ddb1a) and overexpression lines. DDB1A overexpression lines showed higher levels of UV-resistance than wild-type in a range of assays as well as faster DNA repair. However a significant difference between wild-type plants and ddb1a mutants was only observed immediately following UV treatment in root length and photoproduct repair assays. DDB1A and DDB1B mRNA levels increased 3 h after UV exposure and DDB1A is required for UV regulation of DDB1B and DDB2 mRNA levels. In conclusion, while DDB1A is sufficient to increase Arabidopsis UV tolerance, it is only necessary for immediate response to UV damage.
Al Khateeb
Wesam M
WM
Department of Biological Sciences, University of Manitoba, Winnipeg, Manitoba, Canada. wesamkh@yu.edu.jo
Schroeder
Dana F
DF
D000222:Adaptation, Physiological / Q000235:genetics / Q000528:radiation effects; D000477:Alkylating Agents / Q000494:pharmacology; D017360:Arabidopsis / Q000235:genetics* / Q000378:metabolism / Q000528:radiation effects; D029681:Arabidopsis Proteins / Q000235:genetics* / Q000378:metabolism; D004260:DNA Repair; D004268:DNA-Binding Proteins / Q000235:genetics* / Q000378:metabolism; D018506:Gene Expression Regulation, Plant; D006861:Hydrogen Peroxide / Q000494:pharmacology; D016685:Mitomycin / Q000494:pharmacology; D009154:Mutation; D016877:Oxidants / Q000494:pharmacology; D020871:RNA Stability / Q000528:radiation effects; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013997:Time Factors; D014466:Ultraviolet Rays
D000477:Alkylating Agents; D029681:Arabidopsis Proteins; C517426:DDB1a protein, Arabidopsis; C517427:DDB1b protein, Arabidopsis; C530204:DDB2 protein, Arabidopsis; D004268:DNA-Binding Proteins; D016877:Oxidants; D012333:RNA, Messenger; D016685:Mitomycin; D006861:Hydrogen Peroxide