Volkov, Alexander N and Bashir, Qamar and Worrall, Jonathan AR and Ubbink, Marcellus (2009) Binding Hot Spot in the Weak Protein Complex of Physiological Redox Partners Yeast Cytochrome c and Cytochrome c Peroxidase. Journal of Molecular Biology, 385 (3). pp. 1003-1013. DOI https://doi.org/10.1016/j.jmb.2008.10.091
Volkov, Alexander N and Bashir, Qamar and Worrall, Jonathan AR and Ubbink, Marcellus (2009) Binding Hot Spot in the Weak Protein Complex of Physiological Redox Partners Yeast Cytochrome c and Cytochrome c Peroxidase. Journal of Molecular Biology, 385 (3). pp. 1003-1013. DOI https://doi.org/10.1016/j.jmb.2008.10.091
Volkov, Alexander N and Bashir, Qamar and Worrall, Jonathan AR and Ubbink, Marcellus (2009) Binding Hot Spot in the Weak Protein Complex of Physiological Redox Partners Yeast Cytochrome c and Cytochrome c Peroxidase. Journal of Molecular Biology, 385 (3). pp. 1003-1013. DOI https://doi.org/10.1016/j.jmb.2008.10.091
Abstract
Transient protein interactions mediate many vital cellular processes such as signal transduction or intermolecular electron transfer. However, due to difficulties associated with their structural characterization, little is known about the principles governing recognition and binding in weak transient protein complexes. In particular, it has not been well established whether binding hot spots, which are frequently found in strong static complexes, also govern transient protein interactions. To address this issue, we have investigated an electron transfer complex of physiological partners from yeast: yeast iso-1-cytochrome c (Cc) and yeast cytochrome c peroxidase (CcP). Using isothermal titration calorimetry and NMR spectroscopy, we show that Cc R13 is a hot-spot residue, as R13A mutation has a strong destabilizing effect on binding. Furthermore, we employ a double-mutant cycle to illustrate that Cc R13 interacts with CcP Y39. The present results, in combination with those of earlier mutational studies, have enabled us to outline the extent of the energetically important Cc-CcP binding region. Based on our analysis, we propose that binding energy hot spots, which are prevalent in static protein complexes, could also govern transient protein interactions. © 2008 Elsevier Ltd. All rights reserved.
Item Type: | Article |
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Uncontrolled Keywords: | NMR spectroscopy; isothermal titration calorimetry; double-mutant cycles; protein-protein interactions; transient complex |
Subjects: | Q Science > QH Natural history > QH301 Biology |
Divisions: | Faculty of Science and Health Faculty of Science and Health > Life Sciences, School of |
SWORD Depositor: | Unnamed user with email elements@essex.ac.uk |
Depositing User: | Unnamed user with email elements@essex.ac.uk |
Date Deposited: | 11 Oct 2011 15:30 |
Last Modified: | 07 Aug 2024 20:07 |
URI: | http://repository.essex.ac.uk/id/eprint/1086 |