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localizaciones celulares (membrana, citosol, RE,<br />

núcleo). Por si fuera poco, gracias a una<br />

colaboración con la Universidad de Pekín, hemos<br />

descubierto que también las PP2Cs son sujetas a<br />

ubiquitilación y degradación proteolítica por<br />

dif erentes E3 ligasas (Xu et al., env iado). Ello<br />

complementará la actual v isión de la ruta de ABA y<br />

expandirá el papel de los receptores de ABA, que<br />

además de inhibir bioquímicamente a las PP2Cs,<br />

promuev en su ubiquitilación y degradación. Pero<br />

esto será el tema de otra puesta al día.<br />

Referencias<br />

Antoni,R., Gonzalez-Guzman,M., Rodriguez,L.,<br />

Rodrigues,A., Pizzio,G.A. and<br />

Rodriguez,P.L. (2012). Selective Inhibition<br />

of Clade A Phosphatases Ty pe 2C by<br />

PYR/PYL/RCAR Abscisic Acid Receptors.<br />

Plant Physiol 158, 970-980.<br />

Antoni,R., Gonzalez-Guzman,M., Rodriguez,L.,<br />

Peirats-Llobet,M.,<br />

Pizzio,G.A.,<br />

Fernandez,M.A., De Winne,N., De<br />

Jaeger,G., Dietrich,D., Bennett,M.J. and<br />

Rodriguez,P.L. (2013). PYRABACTIN<br />

RESISTANCE1-LIKE8 plays an important<br />

role f or the regulation of abscisic acid<br />

signaling in root. Plant Physiol 161, 931-941.<br />

Bueso,E., Rodriguez,L., Lorenzo-Orts,L.,<br />

Gonzalez-Guzman,M., Sayas,E., Munoz-<br />

Bertomeu,J., Ibanez,C., Serrano,R. and<br />

Rodriguez,P.L. (2014). The single-subunit<br />

RING-ty pe E3 ubiquitin ligase RSL1 targets<br />

PYL4 and PYR1 ABA receptors in plasma<br />

membrane to modulate abscisic acid<br />

signaling. Plant J. 80, 1057-1071.<br />

Cutler,S.R., Rodriguez,P.L., Finkelstein,R.R. and<br />

Abrams,S.R. (2010). Abscisic acid:<br />

emergence of a core signaling network.<br />

Annu. Rev. Plant Biol. 61, 651-679.<br />

Diaz,M., Sanchez-Barrena,M.J., Gonzalez-<br />

Rubio,J.M., Rodriguez,L., Fernandez,D.,<br />

Antoni,R., Yunta,C., Belda-Palazon,B.,<br />

Gonzalez-Guzman,M., Peirats-Llobet,M.,<br />

Menendez,M., Boskovic,J., Marquez,J.A.,<br />

Rodriguez,P.L. and Albert,A. (2016).<br />

Calcium-dependent oligomerization of CAR<br />

proteins at cell membrane modulates ABA<br />

signaling. Proc. Natl. Acad. Sci. U. S. A 113,<br />

E396-E405.<br />

Dupeux,F., Antoni,R., Betz,K., Santiago,J.,<br />

Gonzalez-Guzman,M., Rodriguez,L.,<br />

Rubio,S., Park,S.Y., Cutler,S.R.,<br />

Rodriguez,P.L. and Marquez,J.A. (2011).<br />

Modulation of Abscisic Acid Signaling in Vivo<br />

by an Engineered Receptor-Insensitive<br />

Protein Phosphatase Ty pe 2C Allele. Plant<br />

Physiol 156, 106-116.<br />

Dupeux,F., Santiago,J., Betz,K., Twycross,J.,<br />

Park,S.Y., Rodriguez,L., Gonzalez-<br />

Guzman,M., Jensen,M.R., Krasnogor,N.,<br />

Blackledge,M.,<br />

Holdsworth,M.,<br />

Cutler,S.R., Rodriguez,P.L. and<br />

Marquez,J.A. (2011). A thermodynamic<br />

switch modulates abscisic acid receptor<br />

sensitivity. EMBO J. 30, 4171-4184.<br />

Fujii,H., Chinnusamy,V., Rodrigues,A., Rubio,S.,<br />

Antoni,R., Park,S.Y., Cutler,S.R.,<br />

Sheen,J., Rodriguez,P.L. and Zhu,J.K.<br />

(2009). In vitro reconstitution of an abscisic<br />

acid signalling pathway . Nature 462, 660-<br />

664.<br />

Gao,Y., Zeng,Q., Guo,J., Cheng,J., Ellis,B.E. and<br />

Chen,J.G. (2007). Genetic characterization<br />

rev eals no role f or the reported ABA<br />

receptor, GCR2, in ABA control of seed<br />

germination and early seedling dev elopment<br />

in Arabidopsis. Plant J. 52, 1001-1013.<br />

Geiger,D., Scherzer,S., Mumm,P., Stange,A.,<br />

Marten,I., Bauer,H., Ache,P., Matschi,S.,<br />

Liese,A., Al Rasheid,K.A., Romeis,T. and<br />

Hedrich,R. (2009). Activity of guard cell<br />

anion channel SLAC1 is controlled by<br />

drought-stress signaling kinase-phosphatase<br />

pair. Proc. Natl. Acad. Sci. U. S. A 106,<br />

21425-21430<br />

Gonzalez-Guzman,M., Apostolova,N., Belles,J.M.,<br />

Barrero,J.M., Piqueras,P., Ponce,M.R.,<br />

Micol,J.L., Serrano,R. and Rodriguez,P.L.<br />

(2002). The short-chain alcohol<br />

dehy drogenase ABA2 cataly zes the<br />

conv ersion of xanthoxin to abscisic<br />

aldehy de. Plant Cell 14, 1833-1846.<br />

Gonzalez-Guzman,M., Pizzio,G.A., Antoni,R.,<br />

Vera-Sirera,F., Merilo,E., Bassel,G.W.,<br />

Fernandez,M.A., Holdsworth,M.J., Perez-<br />

Amador,M.A., Kollist,H. and<br />

Rodriguez,P.L. (2012). Arabidopsis<br />

PYR/PYL/RCAR Receptors Play a Major<br />

Role in Quantitative Regulation of Stomatal<br />

Aperture and Transcriptional Response to<br />

Abscisic Acid. Plant Cell 24, 2483-2496.<br />

Guo,J., Zeng,Q., Emami,M., Ellis,B.E. and<br />

Chen,J.G. (2008). The GCR2 gene family is<br />

not required for ABA control of seed<br />

germination and early seedling<br />

dev elopment in Arabidopsis. PLoS. One. 3,<br />

e2982.<br />

Han,S.K., Sang,Y., Rodrigues,A., Wu,M.F.,<br />

Rodriguez,P.L. and Wagner,D. (2012). The<br />

SWI2/SNF2 chromatin remodeling ATPase<br />

BRAHMA represses abscisic acid responses<br />

in the absence of the stress stimulus in<br />

Arabidopsis. Plant Cell 24, 4892-4906.<br />

Irigoyen,M.L., Iniesto,E., Rodriguez,L., Puga,M.I.,<br />

Yanagawa,Y., Pick,E., Strickland,E., Paz-<br />

47

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