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Phosphorylation and proteasome recognition of the mRNA-Binding protein Cth2 facilitates yeast adaptation to iron deficiency

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dc.contributor.author Romero, Antonia M.
dc.contributor.author Martínez Pastor, Mar
dc.contributor.author Du, Gang
dc.contributor.author Solé, Carme
dc.contributor.author Carlos, María
dc.contributor.author Vergara, Sandra V.
dc.contributor.author Sanvisens, Nerea
dc.contributor.author Wohlschlegel, James A.
dc.contributor.author Toczyski, David P.
dc.contributor.author Posas Garriga, Francesc
dc.contributor.author Nadal Clanchet, Eulàlia de
dc.contributor.author Martínez-Pastor, María T.
dc.contributor.author Thiele, Dennis J.
dc.contributor.author Puig, Sergi
dc.date.accessioned 2019-04-05T08:41:09Z
dc.date.available 2019-04-05T08:41:09Z
dc.date.issued 2018
dc.identifier.citation Romero AM, Martínez-Pastor M, Du G, Solé C, Carlos M, Vergara SV, Sanvisens N, Wohlschlegel JA, Toczyski DP, Posas F, de Nadal E, Martínez-Pastor MT, Thiele DJ, Puig S. Phosphorylation and proteasome recognition of the mRNA-Binding protein Cth2 facilitates yeast adaptation to iron deficiency. MBio. 2018; 9(5). pii: e01694-18. DOI 10.1128/mBio.01694-18
dc.identifier.issn 2150-7511
dc.identifier.uri http://hdl.handle.net/10230/37048
dc.description.abstract Iron is an indispensable micronutrient for all eukaryotic organisms due to its participation as a redox cofactor in many metabolic pathways. Iron imbalance leads to the most frequent human nutritional deficiency in the world. Adaptation to iron limitation requires a global reorganization of the cellular metabolism directed to prioritize iron utilization for essential processes. In response to iron scarcity, the conserved Saccharomyces cerevisiae mRNA-binding protein Cth2, which belongs to the tristetraprolin family of tandem zinc finger proteins, coordinates a global remodeling of the cellular metabolism by promoting the degradation of multiple mRNAs encoding highly iron-consuming proteins. In this work, we identify a critical mechanism for the degradation of Cth2 protein during the adaptation to iron deficiency. Phosphorylation of a patch of Cth2 serine residues within its amino-terminal region facilitates recognition by the SCFGrr1 ubiquitin ligase complex, accelerating Cth2 turnover by the proteasome. When Cth2 degradation is impaired by either mutagenesis of the Cth2 serine residues or deletion of GRR1, the levels of Cth2 rise and abrogate growth in iron-depleted conditions. Finally, we uncover that the casein kinase Hrr25 phosphorylates and promotes Cth2 destabilization. These results reveal a sophisticated posttranslational regulatory pathway necessary for the adaptation to iron depletion.IMPORTANCE Iron is a vital element for many metabolic pathways, including the synthesis of DNA and proteins, and the generation of energy via oxidative phosphorylation. Therefore, living organisms have developed tightly controlled mechanisms to properly distribute iron, since imbalances lead to nutritional deficiencies, multiple diseases, and vulnerability against pathogens. Saccharomyces cerevisiae Cth2 is a conserved mRNA-binding protein that coordinates a global reprogramming of iron metabolism in response to iron deficiency in order to optimize its utilization. Here we report that the phosphorylation of Cth2 at specific serine residues is essential to regulate the stability of the protein and adaptation to iron depletion. We identify the kinase and ubiquitination machinery implicated in this process to establish a posttranscriptional regulatory model. These results and recent findings for both mammals and plants reinforce the privileged position of E3 ubiquitin ligases and phosphorylation events in the regulation of eukaryotic iron homeostasis.
dc.description.sponsorship This work was supported by a predoctoral contract from the Spanish Ministry of Economy, Industry and Competitiveness (MINECO) to A.M.R., by a postdoctoral fellowship from MINECO to M.M.-P., by MINECO BIO2014-56298-P, BIO2017-87828-C2-1-P, and Fondo Europeo de Desarrollo Regional (FEDER) grants to S.P., by NIH grant GM089778 to J.A.W., by NIH grant GM041840 to D.J.T., by MINECO BFU2017-85152-P and FEDER grant to E.D.N., by MINECO BFU2015-64437-P and FEDER grant to F.P., and by funding from the Catalan Government (2017 SGR 799) and the Fundación Botín by Banco Santander through its Santander Universities Global Division to F.P. F.P. is a recipient of an ICREA Acadèmia (Generalitat de Catalunya).
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher American Society for Microbiology
dc.relation.ispartof MBio. 2018; 9(5). pii: e01694-18
dc.rights © 2018 Romero et al. This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license (https://creativecommons.org/licenses/by/4.0/).
dc.rights.uri https://creativecommons.org/licenses/by/4.0/
dc.title Phosphorylation and proteasome recognition of the mRNA-Binding protein Cth2 facilitates yeast adaptation to iron deficiency
dc.type info:eu-repo/semantics/article
dc.identifier.doi http://dx.doi.org/10.1128/mBio.01694-18
dc.subject.keyword Iron deficiency
dc.subject.keyword Phosphorylation
dc.subject.keyword Posttranslational regulation
dc.subject.keyword Protein stability
dc.subject.keyword Yeast
dc.relation.projectID info:eu-repo/grantAgreement/ES/1PE/BIO2014-56298-P
dc.relation.projectID info:eu-repo/grantAgreement/ES/2PE/BIO2017-87828-C2-1-P
dc.relation.projectID info:eu-repo/grantAgreement/ES/2PE/BFU2017-85152-P
dc.rights.accessRights info:eu-repo/semantics/openAccess
dc.type.version info:eu-repo/semantics/publishedVersion

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