S
Sampathkumar Krishnan
Researcher at Amgen
Publications - 21
Citations - 3077
Sampathkumar Krishnan is an academic researcher from Amgen. The author has contributed to research in topics: Population & Protein aggregation. The author has an hindex of 18, co-authored 21 publications receiving 2891 citations. Previous affiliations of Sampathkumar Krishnan include Anschutz Medical Campus & Hospira.
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Journal ArticleDOI
Physical Stability of Proteins in Aqueous Solution: Mechanism and Driving Forces in Nonnative Protein Aggregation
TL;DR: The purpose of the current review is to provide a fundamental understanding of the mechanisms by which proteins aggregate and by which varying solution conditions, such as temperature, pH, salt type, salt concentration, cosolutes, preservatives, and surfactants, affect this process.
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Roles of conformational stability and colloidal stability in the aggregation of recombinant human granulocyte colony‐stimulating factor
Eva Y. Chi,Sampathkumar Krishnan,Brent S. Kendrick,Byeong S. Chang,John F. Carpenter,Theodore W. Randolph +5 more
TL;DR: Non‐native aggregation of recombinant human granulocyte stimulating factor (rhGCSF) in solution conditions where native rhG CSF is both conformationally stable compared to its unfolded state and at concentrations well below its solubility limit is studied.
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Silicone Oil- and Agitation-Induced Aggregation of a Monoclonal Antibody in Aqueous Solution
Renuka Thirumangalathu,Sampathkumar Krishnan,Margaret Speed Ricci,David N. Brems,Theodore W. Randolph,John F. Carpenter +5 more
TL;DR: A formulation strategy involving optimization of colloidal stability of the antibody as well as incorporation of surfactants such as polysorbate 20 is proposed to reduce silicone oil-induced aggregation of therapeutic protein products.
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Oxidative dimer formation is the critical rate-limiting step for Parkinson's disease alpha-synuclein fibrillogenesis.
Sampathkumar Krishnan,Eva Y. Chi,Stephen J. Wood,Brent S. Kendrick,Cynthia Li,William Garzon-Rodriguez,Jette Wypych,Theodore W. Randolph,Linda O Narhi,Anja Leona Biere,Martin Citron,John F. Carpenter +11 more
TL;DR: This work has found that the critical rate-limiting step in nucleation of alpha-synuclein fibrils under physiological conditions is the oxidative formation and accumulation of a dimeric, dityrosine cross-linked prenucleus, which supports a mechanism of Parkinson's disease pathogenesis in which the separately studied pathogenic factors of oxidative stress and alpha- synuclein aggregation converge at the critical step ofalpha-syn DNA dimer formation.
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Aggregation of granulocyte colony stimulating factor under physiological conditions: characterization and thermodynamic inhibition.
Sampathkumar Krishnan,Eva Y. Chi,Jonathan N. Webb,Byeong S. Chang,Daxian Shan,Merrill Goldenberg,Mark C. Manning,Theodore W. Randolph,John F. Carpenter +8 more
TL;DR: Investigation of the aggregation of recombinant human granulocyte colony stimulating factor finds that native monomeric rhGCSF reversibly forms a dimer under physiological conditions and that this dimeric species does not participate in the irreversible aggregation process, and proposes that sucrose, a thermodynamic stabilizer, inhibits the aggregation.