In silico and in vivo studies of molecular structures and mechanisms of AtPCS1 protein involved in binding arsenite and/or cadmium in plant cells
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- 作者：Noor Nahar (1)
Aminur Rahman (1)
Maria Mo? (2)
Tomasz Warzecha (2)
Sibdas Ghosh (3)
Khaled Hossain (4)
Neelu N. Nawani (5)
Abul Mandal (1) - 关键词：Arabidopsis thaliana ; Substrate binding residue ; Heavy metal ; In silico analysis ; In vivo experiment ; Phytochelatin synthase
- 刊名：Journal of Molecular Modeling
- 出版年：2014
- 出版时间：March 2014
- 年：2014
- 卷：20
- 期：3
- 全文大小：1,293 KB
- 作者单位：Noor Nahar (1)
Aminur Rahman (1)
Maria Mo? (2)
Tomasz Warzecha (2)
Sibdas Ghosh (3)
Khaled Hossain (4)
Neelu N. Nawani (5)
Abul Mandal (1)
1. School of Biological Sciences, System Biology Research Center, University of Sk?vde, PO Box 408, 541 28, Sk?vde, Sweden
2. Department of Plant Breeding and Seed Science, University of Agriculture in Krakow, Krakow, Poland
3. School of Arts and Science, Iona College, New Rochelle, NY, 10801, USA
4. Department of Biochemistry and Molecular Biology, University of Rajshahi, 6205, Rajshahi, Bangladesh
5. Dr. D. Y. Patil Biotechnology and Bioinformatics Institute, Dr. D. Y. Patil Vidyapeeth University, Tathawade, Pune, 411033, India - ISSN：0948-5023
文摘
This paper reports a continuation of our previous research on the phytochelatin synthase1 (PCS1) gene involved in binding and sequestration of heavy metals or metalloids in plant cells [1]. Construction of a 3D structure of the Arabidopsis thaliana PCS1 protein and prediction of gene function by employing iterative implementation of the threading assembly refinement (I-TASSER) revealed that PC ligands (3GC-gamma-glutamylcysteine) and Gln50, Pro53, Ala54, Tyr55, Cys56, Ile102, Gly161, His162, Phe163, Asp204 and Arg211 residues are essential for formation of chelating complex with cadmium (Cd2+) or arsenite (AsIII). This finding suggests that the PCS1 protein might be involved in the production of the enzyme phytochelatin synthase, which might in turn bind, localize, store or sequester heavy metals in plant cells. For validation of the in silico results, we included a T-DNA tagged mutant of Arabidopsis thaliana, SAIL_650_C12, (mutation in AtPCS1 gene) in our investigation. Furthermore, using reverse transcriptase PCR we confirmed that the mutant does not express the AtPCS1 gene. Mutant plants of SAIL_650_C12 were exposed to various amounts of cadmium (Cd2+) and arsenite (AsIII) and the accumulation of these toxic metals in the plant cells was quantified spectrophotometrically. The levels of Cd2+ and AsIII accumulation in the mutant were approximately 2.8 and 1.6 times higher, respectively, than that observed in the wild-type controlled plants. We confirmed that the results obtained in in silico analyses complement those obtained in in vivo experiments.