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Driven by such controversial evidence, in this work we performed a series of atomistic molecular dynamics simulations of insulin monomer, a biologically active hormone protein, in arginine solution of varying concentrations (0.5, 1, and 2 M) at ambient and elevated temperature (400 K) to explore the arginine concentration driven structure-based stability of the protein. Our study reveals that the flexibility of the protein\u2019s structure is dependent on the arginine concentration, and among all the used solutions, 2 M arginine, a \u201cneutral crowder\u201d that mimics the cellular environment, can preserve the native folded form of the protein at ambient temperature in an excellent manner. Further, while the protein unfolds at 400 K in pure water, this solution worked satisfactorily to preserve the protein\u2019s folded conformation more firmly than the other solutions. The replica-exchange MD of insulin in 2 M arginine solution further supports the fact. In this aspect an important issue in molecular pharmacology is to identify and recognize the physical origin of the stability of a protein, i.e, in this case, how arginine directs the conformational flexibility of the protein and preserves its native folded form. We identified that the exclusion of arginine from the protein surface increases the local structuration of water around the protein, thereby preserving its \u201cbiological water\u201d layer, and makes the protein more hydrated at 2 M concentration as compared to the other arginine solutions. Additionally, our microscopic investigation on the interactions of the protein-solvation layer revealed that the structural heterogeneity of the protein surface, arising from the differential physicochemical nature of the amino acid residues, controls the favorable formation of sluggish water\u2013arginine mixed solvation layer at higher arginine concentration that helps the protein to maintain its structural rigidity. Importantly, apart from the protein\u2013solvent hydrogen-bonding interactions, the anion\u2013pi interactions, established between the carboxyl group of arginine and the aromatic amino acid residues of insulin, were recognized to facilitate the protein to maintain its native folded form at the experimental temperatures.<\/jats:p>","DOI":"10.1021\/acs.jcim.0c00006","type":"journal-article","created":{"date-parts":[[2020,6,1]],"date-time":"2020-06-01T17:35:15Z","timestamp":1591032915000},"page":"3105-3119","source":"Crossref","is-referenced-by-count":18,"title":["Insights into the Sensitivity of Arginine Concentration\nto Preserve the Folded Form of Insulin Monomer under Thermal Stress"],"prefix":"10.1021","volume":"60","author":[{"given":"Santanu","family":"Santra","sequence":"first","affiliation":[{"name":"National Institute of Technology , , - ,","place":["Rourkela, India, 769008"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6567-4490","authenticated-orcid":true,"given":"Madhurima","family":"Jana","sequence":"additional","affiliation":[{"name":"National Institute of Technology , , - ,","place":["Rourkela, India, 769008"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2020,6,1]]},"reference":[{"key":"2026081804420919000_cit1","doi-asserted-by":"publisher","first-page":"1626","DOI":"10.1074\/jbc.M007766200","article-title":"Counteracting\nEffects of Renal Solutes on Amyloid Fibril\nFormation by Immunoglobulin Light Chains","volume":"276","author":"Kim","year":"2001","journal-title":"J.\nBiol. 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