title: The role of electrostatic interactions on klentaq1 insight for domain separation.
abstract: We investigated the relationship between the thermostability of Klentaq1 and factors stabilizing interdomain interactions. When thermal adaptation of Klentaq1 was analyzed at the atomic level, the protein was stable at 300 and 350 K. It gradually unfolded at 373 K and almost spontaneously unfolded at 400 K. Domain separation was induced by disrupting electrostatic interactions in two salt bridges formed by Lys354-Glu445 and Asp371-Arg435 on the interface domain. The role of these interactions in protein stability was evaluated by comparing free energy solvation (ΔΔG(solv)) between wild type and mutants. Substitution of Asp371 by Glu or Asn, and also Glu445 by Asn resulted in a positive value of ΔΔG(solv), suggesting that mutations destabilized the protein structure. Nevertheless, substitution of Glu445 by Asp gave a negative value to ΔΔG(solv) reflecting increasing protein stability. Our results demonstrate that interactions at the interface domains of Klentaq1 are essential factors correlated with the Klentaq1 thermostability.
authors.affiliation: Biochemistry Research Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Indonesia.
authors.forename: Santi
authors.initials: S
authors.lastname: Nurbaiti
authors.forename: Muhamad A
authors.initials: MA
authors.lastname: Martoprawiro
authors.lastname: Akhmaloka
authors.forename: Rukman
authors.initials: R
authors.lastname: Hertadi
keywords: Klentaq1; domain separation; electrostatic interaction; in silico mutation