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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/30789

Title: Post-Translational Modifications Modulate Ligand Recognition by the Third PDZ Domain of the MAGUK Protein PSD-95
Authors: Murciano-Calles, Javier
Corbi Verge, Carlos
Candel Ramón, Adela María
Luque Fernández, Irene
Martínez Herrerías, José C.
Issue Date: 2014
Abstract: The relative promiscuity of hub proteins such as postsynaptic density protein-95 (PSD-95) can be achieved by alternative splicing, allosteric regulation, and post-translational modifications, the latter of which is the most efficient method of accelerating cellular responses to environmental changes in vivo. Here, a mutational approach was used to determine the impact of phosphorylation and succinimidation post-translational modifications on the binding affinity of the postsynaptic density protein-95/discs large/zonula occludens-1 (PDZ3) domain of PSD-95. Molecular dynamics simulations revealed that the binding affinity of this domain is influenced by an interplay between salt-bridges linking the α3 helix, the β2–β3 loop and the positively charged Lys residues in its high-affinity hexapeptide ligand KKETAV. The α3 helix is an extra structural element that is not present in other PDZ domains, which links PDZ3 with the following SH3 domain in the PSD-95 protein. This regulatory mechanism was confirmed experimentally via thermodynamic and NMR chemical shift perturbation analyses, discarding intra-domain long-range effects. Taken together, the results presented here reveal the molecular basis of the regulatory role of the α3 extra-element and the effects of post-translational modifications of PDZ3 on its binding affinity, both energetically and dynamically.
Sponsorship: This research was supported by grants CVI-05915, from the Andalusian Regional Government (http://www.juntadeandalucia.es), BIO2009-13261-C02 and BIO2012-39922-C02, from the Spanish Ministry of Science and Innovation (http://www.idi.mineco.gob.es/portal/site​/MICINN/) and FEDER. JMC received a postdoctoral contract from the Spanish Ministry of Science and Innovation. CCV was a recipient of a Formación de Personal Investigador fellowship from the Spanish Ministry of Science and Innovation.
Publisher: Public Library of Science (PLOS)
Keywords: Biochemical simulations
Nuclear magnetic resonance
Post-translational modification
Salt bridges
URI: http://hdl.handle.net/10481/30789
ISSN: 1932-6203
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Murciano-Calles, J.; et al. Post-Translational Modifications Modulate Ligand Recognition by the Third PDZ Domain of the MAGUK Protein PSD-95. Plos One, 9(2): e90030 (2014). [http://hdl.handle.net/10481/30789]
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