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In silico and in vivo studies of molecular structures and mechanisms of AtPCS1 protein involved in binding arsenite and/or cadmium in plant cells
School of Biological Sciences, System Biology Research Center, University of Skövde, Skövde, Sweden.
School of Biological Sciences, System Biology Research Center, University of Skövde, Skövde, Sweden.ORCID iD: 0000-0002-8162-8945
Department of Plant Breeding and Seed Science, University of Agriculture in Krakow, Krakow, Poland.
Department of Plant Breeding and Seed Science, University of Agriculture in Krakow, Krakow, Poland.
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2014 (English)In: Journal of Molecular Modeling, ISSN 1610-2940, E-ISSN 0948-5023, Vol. 20, no 3, article id 2104Article in journal (Refereed) Published
Abstract [en]

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. 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.

Place, publisher, year, edition, pages
Springer, 2014. Vol. 20, no 3, article id 2104
Keywords [en]
Arabidopsis thaliana, Substrate binding residue, Heavy metal, In silico analysis, In vivo experiment, Phytochelatin synthase
National Category
Biochemistry and Molecular Biology Plant Biotechnology
Research subject
Natural sciences
Identifiers
URN: urn:nbn:se:oru:diva-70461DOI: 10.1007/s00894-014-2104-0ISI: 000332180100010PubMedID: 24554125Scopus ID: 2-s2.0-84893828770OAI: oai:DiVA.org:oru-70461DiVA, id: diva2:1267924
Projects
Bioremediation
Funder
Sida - Swedish International Development Cooperation Agency, AKT-2010-018Swedish Research Council Formas, 229-2007-217
Note

Funding agency:

The Nilsson-Ehle Foundation (The Royal Physiographic Society in Lund)

Available from: 2018-12-04 Created: 2018-12-04 Last updated: 2018-12-06Bibliographically approved

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Nahar, NoorRahman, AminurMandal, Abul

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