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Glutenin and Gliadin, a Piece in the Puzzle of their Structural Properties in the Cell Described through Monte Carlo Simulations
Swedish Univ Agr Sci, Dept Plant Breeding, POB 101, SE-23053 Alnarp, Sweden..
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.ORCID iD: 0000-0002-6071-6241
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Polymeric Materials.ORCID iD: 0000-0003-4305-2743
Lund Univ, Theoret Chem, POB 124, SE-22100 Lund, Sweden..
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2020 (English)In: Biomolecules, E-ISSN 2218-273X, Vol. 10, no 8, article id 1095Article in journal (Refereed) Published
Abstract [en]

Gluten protein crosslinking is a predetermined process where specific intra- and intermolecular disulfide bonds differ depending on the protein and cysteine motif. In this article, all-atom Monte Carlo simulations were used to understand the formation of disulfide bonds in gliadins and low molecular weight glutenin subunits (LMW-GS). The two intrinsically disordered proteins appeared to contain mostly turns and loops and showed "self-avoiding walk" behavior in water. Cysteine residues involved in intramolecular disulfide bonds were located next to hydrophobic peptide sections in the primary sequence. Hydrophobicity of neighboring peptide sections, synthesis chronology, and amino acid chain flexibility were identified as important factors in securing the specificity of intramolecular disulfide bonds formed directly after synthesis. The two LMW-GS cysteine residues that form intermolecular disulfide bonds were positioned next to peptide sections of lower hydrophobicity, and these cysteine residues are more exposed to the cytosolic conditions, which influence the crosslinking behavior. In addition, coarse-grained Monte Carlo simulations revealed that the protein folding is independent of ionic strength. The potential molecular behavior associated with disulfide bonds, as reported here, increases the biological understanding of seed storage protein function and provides opportunities to tailor their functional properties for different applications.

Place, publisher, year, edition, pages
MDPI , 2020. Vol. 10, no 8, article id 1095
Keywords [en]
modeling, intrinsically disordered proteins, gluten, disulfide bonds, cysteine, prolamin, Monte Carlo
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:kth:diva-285646DOI: 10.3390/biom10081095ISI: 000578814000001PubMedID: 32717949Scopus ID: 2-s2.0-85088570762OAI: oai:DiVA.org:kth-285646DiVA, id: diva2:1499765
Note

QC 20201110

Available from: 2020-11-10 Created: 2020-11-10 Last updated: 2022-06-25Bibliographically approved

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Hedenqvist, Mikael S.Rasheed, Faiza

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