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Investigating the Effects of Double Mutation C30A/C75A on Onconase Structure: Studies at Atomic Resolution

The structure of onconase C30A/C75A double mutant has been determined at 1.12A° resolution. The structure has high structural homology to other onconase structures. The changes being results of mutation are relatively small, distributed asymmetrically around the two mutated positions, and they are observed not only in the mutation region but expanded to entire molecule. Different conformation of Lys31 side chain that influences the hydrogen bonding network around catalytic triad is probably responsible for lower catalytic efficiency of double mutant. The decrease in thermal stability observed for the onconase variant might be explained by a less dense packing as manifested by the increase of the molecular volume and the solvent accessible surface area

© Biopolymers, 2014, vol. 101, núm. 5, p. 454-460

Wiley

Author: Kurpiewska, Katarzyna
Torrent, Gerard
Ribó i Panosa, Marc
Loch, Joanna I.
Vilanova i Brugués, Maria
Lewiński, Krzysztof
Date: 2014
Abstract: The structure of onconase C30A/C75A double mutant has been determined at 1.12A° resolution. The structure has high structural homology to other onconase structures. The changes being results of mutation are relatively small, distributed asymmetrically around the two mutated positions, and they are observed not only in the mutation region but expanded to entire molecule. Different conformation of Lys31 side chain that influences the hydrogen bonding network around catalytic triad is probably responsible for lower catalytic efficiency of double mutant. The decrease in thermal stability observed for the onconase variant might be explained by a less dense packing as manifested by the increase of the molecular volume and the solvent accessible surface area
Format: application/pdf
ISSN: 0006-3525 (versió paper)
1097-0282 (versió electrònica)
Document access: http://hdl.handle.net/10256/12103
Language: eng
Publisher: Wiley
Collection: MICINN/PN 2010-2012/BFU2009-06935
Reproducció digital del document publicat a: http://dx.doi.org/10.1002/bip.22403
Articles publicats (D-B)
Is part of: © Biopolymers, 2014, vol. 101, núm. 5, p. 454-460
Rights: Tots els drets reservats
Subject: Ribonucleases
Enzims
Enzymes
Enginyeria de proteïnes
Protein engineering
Title: Investigating the Effects of Double Mutation C30A/C75A on Onconase Structure: Studies at Atomic Resolution
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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