Availability of NHS-biotin labeling to identify free protein lysine revealed by experiment and MD simulation

Analytical Biochemistry
Aiichiro MuraokaNaoki Kunishima

Abstract

It is known that the crystallizability of protein molecules may be improved by replacing their surface lysine residues with other residue types. Here an experimental method to identify surface lysine residues by NHS-biotin chemical modification combined with MALDI-TOF MS was proposed and was evaluated using PH1033 protein from Pyrococcus horikoshii. Interestingly, the biotinylation experiment with a protein-reagent molar ratio of 1:1 revealed that only seven of twenty-two lysine residues in the protein comprising 144 residues were labeled. To investigate the result, we analyzed structures from a molecular-dynamics simulation mimicking the experiment. A logistic regression analysis revealed that the biotinylation was significantly correlated with four factors relevant to the local environment of lysine residues: the solvent accessibility, the electrostatic energy, the number of hydrogen bonds, and the estimated pKa value. This result is overall in agreement with that from the same analysis on the crystal structure. However, reflecting the flexibility of the protein molecule in solution state, the factors except for the electrostatic energy were highly variable in the MD structures depending upon the protonation state of Tyr87. T...Continue Reading

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Citations

Mar 5, 2020·Molecular & Cellular Proteomics : MCP·Payman Samavarchi-TehraniAnne-Claude Gingras
Jan 17, 2021·Molecular & Cellular Proteomics : MCP·Payman Samavarchi-TehraniAnne-Claude Gingras
Nov 18, 2021·Chemical Research in Toxicology·Hasmik GrigoryanStephen M Rappaport

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