title: Identification of potential targets for thylakoid oxidoreductase AtVKOR/LTO1 in chloroplasts.
abstract: The Arabidopsis thylakoid membrane bimodular oxidoreductase, AtVKOR, could catalyze disulfide bond formation, and its direct functional domain (thioredoxin-like domain) is located in the thylakoid lumen according to the topological structure. Many proteins have one or several disulfide bonds in the thylakoid lumen, including photosynthetic chain components. A yeast two-hybrid assay was used to identify potential targets for the AtVKOR, and a Trx-like domain was constructed into a BD vector as bait. Twenty-two thylakoid lumenal proteins with disulfides were selected. The cDNAs encoding these proteins were constructed into an AD vector. Eight proteins were identified from the hybrid results to interact with AtVKOR, including HCF164, cytochrome c6A, violaxanthin deepoxidase, embryo sac development arrest 3 protein (EDA3), two members pentapeptide repeat proteins (TL17 and TL20.3), and two FK-506 binding proteins (FKBP13 and FKBP20-2). The BIACORE system was used to demonstrate that the recombinant HCF164 and Trx-like domain of AtVKOR could interact directly in vitro. The KD value for binding HCF164 to AtVKOR was calculated as 2.5×10(-6) M. These results suggest that AtVKOR can interact with partial thylakoid lumenal proteins and indicates AtVKOR plays an important role in regulating the thylakoid lumen redox.
authors.forename: Ying
authors.initials: Y
authors.lastname: Lu
authors.forename: Jia-Jia
authors.initials: JJ
authors.lastname: Du
authors.forename: Zhi-Bo
authors.initials: ZB
authors.lastname: Yu
authors.forename: Jun-Jie
authors.initials: JJ
authors.lastname: Peng
authors.forename: Jia-Ning
authors.initials: JN
authors.lastname: Xu
authors.affiliation: College of Life Science, Shandong Agricultural University, Shandong Taian 271000, People's Republic of China. xyunwang@sdau.edu.cn.
authors.forename: Xiao-Yun
authors.initials: XY
authors.lastname: Wang
mesh_terms: D017360:Arabidopsis / Q000166:cytology / Q000201:enzymology* / Q000235:genetics / Q000378:metabolism; D029681:Arabidopsis Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D002736:Chloroplasts / Q000201:enzymology* / Q000235:genetics / Q000378:metabolism; D003001:Cloning, Molecular; D004220:Disulfides / Q000737:chemistry; D010088:Oxidoreductases / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D011485:Protein Binding; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D013379:Substrate Specificity; D060431:Thylakoid Membrane Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D020798:Two-Hybrid System Techniques
chemical_list: D029681:Arabidopsis Proteins; D004220:Disulfides; D011994:Recombinant Proteins; D060431:Thylakoid Membrane Proteins; D010088:Oxidoreductases; C445073:HCF164 protein, Arabidopsis