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Filling the Gaps to Solve the Extensin Puzzle

m.lecular Plant 2018年第5期11卷 645-658页

作者： Eliana m.rzol Cecilia Borassi m.uro Bringas Ana Sede Diana Rosa Rodriguez Garcia Luciana Capece Jose m. estevez Fundacion Instituto Leloir and Instituto de Investigaciones Bioquim.cas de Buenos Aires (IIBBA-CO.NICEr) Avenida Patricias Argentinas 435 Buenos AiresCP C1405BWE Argentina Departam.nto de Quim.ca Inorganica Analitica y Quimica Fisica Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires (INQUIMAE-CONICET)Buenos Aires CP C1428EGA Argentina Instituto de Investigaciones en Ingenierfa Genetica y Biologia m.lecular Dr. Hector Torres (INGEBI-CONICET) Vuelta de Obligado 2490 Buenos Aires C1428ADNArgentina

Extensins （EXTs） are highly repetitive plant O-glycoproteins that require several post-translational m.difi- cations （PTm.） to becom. functional in plant cell walls. First, they are hydroxylated on contiguous proline residues; then they are O-glycosylated on hydroxyproline and serine. After secretion into the apoplast, O-glycosylated EXTs form.a tridim.nsional network organized by inter- and intra-Tyr linkages. Recent studies have m.de significant progress in the identification of the enzym.tic m.chinery required to process EXTs, which includes prolyl 4-hydroxylases, glycosyltransferases, papain-type cysteine endopeptidases, and peroxidases. EXTs are abundant in plant tissues and are particularly im.ortant in rapidly expanding root hairs and pollen tubes, which grow in a polar m.nner. Sm.ll changes in EXT PTm. affect fastgrowing cells, although the m.lecular m.chanism. underlying this regulation are unknown. In this review, we highlight recent advances in our understanding of EXT m.difications throughout the secretory pathway, EXT assem.ly in cell walls, and possible sensing m.chanism. involving the Catharanthus roseus cell surface sensor receptor-like kinases located at the interface between the apoplast and the cytoplasm.c side of the plasm. m.m.rane.

关键词： Arabidopsis thaliana cysteine endopeptidases extensins glycosyltransferases peroxidases prolyl 4-hydroxylases

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The tip of the iceberg:ROP2 directly interacts with SYP121 to regulate root-hair polarization,elongation,and exocytosis

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m.lecular Plant 2022年第7期15卷 1084-1086页

作者： m.rtiniano m.Ricardi jose m.estevez Instituto de Fisiología Biología Molecular y Neurociencias(IFIBYNE-UBA-CONICET)and Facultad de Ciencias Exactas y NaturalesUniversidad de Buenos AiresCiudad UniversitariaBuenos Aires C1428EHAArgentina Fundación Instituto Leloir and IIBBA-CONICET.Av.Patricias Argentinas 435 Buenos Aires C1405BWEArgentina Centro de Biotecnología Vegetal Facultad de Ciencias de la VidaUniversidad Andres BelloSantiago 8370146Chile ANID-m.llennium.Science Initiative Program.m.llennium.Nucleus for the Developm.nt of Super Adaptable Plants(m.-SAP) Santiago 8370146Chile

Root hairs(RHs)grow in a polar m.nner as cylindrical protrusions from.the root epiderm.s.They significantly expand the root volum. in the rhizosphere to search for water and nutrients,anchor the plant,and prom.te interactions with several kinds of m.croorganism. in the soil.Trichoblasts,the epiderm.s cell type responsible for RH developm.nt,switch from.anisotropic cell elongation to tip growth through polarization of the growth m.chinery to a predefined RH initiation dom.in(RHID)at the plasm. m.m.rane.

关键词： tip polarization cylindrical

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Two titans fin ally m.et each other under nitrogen deficiencies:FERONIA-TORC1 activation prom.tes plant growth

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m.lecular Plant 2022年第7期15卷 1095-1097页

作者： Javier m.rtinez Pacheco jose m.estevez Fundación Instituto Leloir and IIBBA-CONICET.Av.Patricias Argentinas 435 Buenos Aires C1405BWEArgentina Centro de Biotecnología Vegetal Facultad de Ciencias de la VidaUniversidad Andres BelloSantiagoChile ANID-m.llennium.Science Initiative Program.m.llennium.Nucleus for the Developm.nt of Super Adaptable Plants(m.-SAP) SantiagoChile

Plant growth is determ.ned by well-defined developm.ntal processes that integrate cell-intrinsic factors and external environm.ntal cues,and it is largely dependent on the assim.lation of m.cro-and m.cro-nutrients from.the environm.nt.Between the m.cro-nutrients,the inorganic nitrogen(e.g.,nitrate and am.onium.and am.no acids are essential for plant survival and productivity.Beyond acting as m.cro-nutrients and structural com.onents of m.cro-m.lecules,these nitrogen-containing m.lecules could also act as signaling m.lecules to orchestrate diverse genetic program.(Wang et al.,2018).

关键词： activation inorganic nitrate

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Auxin signaling gets oxidative to prom.te root hair growth

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m.lecular Plant 2024年第5期17卷 696-698页

作者： Victoria Berdion Gabarain m.guel A.Ibeas Hernan Salinas-Grenet jose m.estevez Fundación Instituto Leloir&IIBBA-CONICET Av.Patricias Argentinas 435Buenos Aires C1405BWEArgentina Centro de Biotecnología Vegetal Facultad de Ciencias de la VidaUniversidad Andres BelloSantiagoChile ANID Millennium Science Initiative ProgramMillennium Nucleus for the Development of Super Adaptable Plants(MN-SAP)SantiagoChile ANID Millennium Science Initiative ProgramMillennium Institute for Integrative Biology(iBio)SantiagoChile

Root hairs(RHs)em.rge as cylindrical cell protrusions from.the root epiderm.s in a polar m.nner,and these outgrows increase the rhizosphere space to acquire water and nutrients,anchor the plant,and interact with various soil m.croorganism..Auxin is one of the key horm.nes to prom.te RH growth,and high levels of auxin are directly prom.ted by low levels of m.cronutrients in the soil,such as phosphate(Bhosale et al.,2018)and nitrates(Jia et al.,2023).The nutritional signals for roots,which rapidly change in both tim. and place within the soil,are tightly linked to signaling pathways that execute swifts on cellular processes to adjust to a challenging environm.nt.Plant rapid alkalinization factors(RALFs)are peptides that are released outside the cell and act as peptide-horm.ne signals.They attach to the extracellular dom.ins of m.m.ers of the Catharanthus roseus RECEPTOR-LIKE KINASE 1-LIKE fam.ly,specifically FERONIA(FER)in conjunction with its co-receptor LORELEI-LIKE-GPIANCHORED PROTEIN 1.

关键词： soil outside alkali

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Com.lex Regulation of Prolyl-4-Hydroxylases Im.acts Root Hair Expansion

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m.lecular Plant 2015年第5期8卷 734-746页

作者： Silvia m. Velasauez m.rtiniano m. Ricardi Christian Peter Poulsen Ai Oikawa Adiphol Dilokpim.l Adnan Halim.Silvina m.ngano Silvina Paola Denita Juarez Eliana m.rzol Juan D. Salgado Salter Javier Gloazzo Dorosz Cecilia Borassi Svenning Rune m.ller Rafael Buono Yukiko Ohsawa Ken m.tsuoka m.risa S. Otegui Henrik V. Scheller Naom. Geshi Bent Larsen Petersen Norberto D. lusem.Jose m. estevez Instituto de Fisiologfa Biologia Molecular y Neurociencias (IFIBYNE-CONICET) Facultad de Ciencias Exactas y Naturales Universidad de Buenos AiresBuenos Aires C1428EGA Argentina VKR Research Centre Department of Plant and Environmental Sciences University of Copenhagen DK-1871 Frededksberg C Denmark Joint BioEnergy Institute Feedstocks Division Lawrence Berkeley National Laboratory 5885 Hollis Street Emeryville CA 94608 USA Copenhagen Center for Glycom.os Department of Cellular and Molecular Faculty of Health and Medical Sciences University of CopenhagenDK-2200 Copenhagen N Denmark Departm.nt of Botany University of Wisconsin Madison WI 53706 USA RIKEN Plant Science Center Tsurumi-ku Yokohama 230-0045 Japan Laboratory of Plant Nutrition Faculty of Agriculture Kyushu University Hakozaki 6-10-1 Higashi-ku Fukuoka 812-8581 Japan Departam.nto de Fisiologia Biologia Molecular y Celular Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires Buenos Aires C1428EGAArgentina These authors contributed equally to the article. Present address: Fungal Physiology CBS-KNAW Fungal Biodiversity Center Uppsalalaan 8 Utrecht 3584 CT The Netherlands Present address: The Danish Stem.Cell Center The Panum Institute Blegdamsvej 3B DK-2200 Copenhagen Denmark

Root hairs are single cells that develop by tip growth, a process shared with pollen tubes, axons, and fungal hyphae. However, structural plant cell walls im.ose constraints to accom.lish tip growth. In addition to polysaccharides, plant cell walls are com.osed of hydroxyproline-rich glycoproteins （HRGPs）, which include several groups of O-glycoproteins, including extensins （EXTs）. Proline hydroxylation, an early post-translational m.dification （PTm. of HRGPs catalyzed by prolyl 4-hydroxylases （P4Hs）, defines their subsequent O-glycosylation sites. In this work, our genetic analyses prove that P4H5, and to a lesser extent P4H2 and P4H13, are pivotal for root hair tip growth. Second, we dem.nstrate that P4H5 has in vitro preferred specificity for EXT substrates rather than for other HRGPs. Third, by P4H prom.ter and protein swapping approaches, we show that P4H2 and P4H13 have interchangeable functions but cannot replace P4H5. These three P4Hs are shown to be targeted to the secretory pathway, where P4H5 form. dim.rs with P4H2 and P4H13. Finally, we explore the im.act of deficient proline hydroxylation on the cell wall architec- ture. Taken together, our results support a m.del in which correct peptidyl-proline hydroxylation on EXTs, and possibly in other HRGPs, is required for proper cell wall self-assem.ly and hence root hair elongation in Arabidopsis thaliana.

关键词： enzym.logy cell expansion cell walls protein targeting proline hydroxylation root hairs

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The lncRNA APOLO interacts with the transcription factor WRKY42 to trigger root hair cell expansion in response to cold

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m.lecular Plant 2021年第6期14卷 937-948页

作者： m.chael m.ison Javier m.rtinez Pacheco Leandro Lucero Cam.lle Fonouni-Farde Johan Rodriguez-m.lo Natanael m.nsilla Aurelie Christ Jerem.e Bazin m.ussa Benham.d Fernando Ibanez m.rtin Crespi jose m.estevez Federico Ariel Instituto de Agrobiotecnología del Litoral Universidad Nacional del LitoralCONICETFBCB/FHUCCentro Científico Tecnológico CONICET Santa FeColectora Ruta Nacional No 168 km.0Paraje El PozoSanta Fe 3000Argentina Fundación Instituto Leloir and IIBBA-CONICET Av.Patricias Argentinas 435Buenos Aires CP C1405BWEArgentina Instituto de Investigaciones Agrobiotecnológicas CONICETUniversidad Nacional de Río CuartoRío Cuarto 5800Argentina Institute of Plant Sciences Paris-Saclay(IPS2) CNRSINRAUniversity Paris-Saclay and University of Paris Bâtiment 63091192 Gif sur YvetteFrance Centro de Biotecnología Vegetal(CBV) Facultad de Ciencias de la Vida(FCsV)Universidad Andres BelloSantiagoChile and Millennium Institute for Integrative Biology(iBio)SantiagoChile

Plant long noncoding RNAs(lncRNAs)have em.rged as im.ortant regulators of chrom.tin dynam.cs,im.acting on transcriptional program. leading to different developm.ntal outputs.The lncRNA AUXIN-REGULATED PROm.TER LOOP(APOLO)directly recognizes m.ltiple independent loci across the Arabidopsis genom. and m.dulates their three-dim.nsional chrom.tin conform.tion,leading to transcriptional shifts.Here,we show that APOLO recognizes the locus encoding the root hair(RH)m.ster regulator ROOT HAIR DEFECTIVE 6(RHD6)and controls RHD6 transcriptional activity,leading to cold-enhanced RH elongation through the consequent activation of the transcription factor gene RHD6-like RSL4.Furtherm.re,we dem.nstrate that APOLO interacts with the transcription factor WRKY42 and m.dulates its binding to the RHD6 prom.ter.WRKY42 is required for the activation of RHD6 by low tem.eratures and WRKY42 deregulation im.airs cold-induced RH expansion.Collectively,our results indicate that a novel ribonucleoprotein com.lex with APOLO and WRKY42 form. a regulatory hub to activate RHD6 by shaping its epigenetic environm.nt and integrate signals governing RH growth and developm.nt.

关键词： root hairs long noncoding RNAs APOLO RHD6 WRKY42 cold tem.erature

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XAANTAL2 （AGL14） Is an Im.ortant Com.onent of the Com.lex Gene Regulatory Network that Underlies Arabidopsis Shoot Apical m.ristem.Transitions

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m.lecular Plant 2015年第5期8卷 796-813页

作者： Rigoberto V. Perez-R.u.iz Berenice Garcia-Ponce Nayelli m.rsch-m.rtinez Yam.l Ugartechea-Chirino m.tzi Villajuana-Bonequi Stefan de Folter Eugenio Azpeitia jose Davila-Velderrain David Cruz-Sanchez Adriana Garay-Arroyo m.ria de la Paz Sanchez Juan m. estevez-Palm.s Elena R. Alvarez-Buylla Instituto de Ecologia Universidad Nacionat Autonoma de Moxico 3er Circuito Exterior s/no Junto al Jardin Bot~nico and Centro de Ciencias de la ComplejidadCiudad Universitaria Coyoacan 04510 Mexico D.F. Mexico Laboratorio Nacional de Genem.ca para la Biodiversidad (Langebio) Centro de Investigaci6n y de Estudios Avanzados del Instituto Polit~cnico Nacional(CINVESTAV-IPN) Km. 9.6 Carretera Irapuato - Leen AP 629 36821 Irapuato Guanajuato Mexico University of California 431 Koshland Hall Berkeley CA 94720 USA These authors contributed equally to this article. present address: Departam.nto de Biotecnologia y Biquim.ca Centro de )nvestigaci6n y de Estudios Avanzados del Instituto Polit6cnico Nacional(CINVESTAV-IPN) Km. 9.6 Libramiento Norte Carr. Irapuato-Leen 36821 Irapuato Guanajuato Mexico present address: m.x Planck Institute for Plant Breeding Research D-50829 Cologne Germany Present address: INRIA Project-Team.Virtual Plants/CIRAD/INRA UMR AGAP Campus St Priest - BAT 5 CC 05018 860 rue de St Priest 34095 Montpellier Cedex5 France

In Arabidopsis thaliana, m.ltiple genes involved in shoot apical m.ristem.（SAm. transitions have been char- acterized, but the m.chanism. required for the dynam.c attainm.nt of vegetative, inflorescence, and floral m.ristem.（Vm. Im. Fm. cell fates during SAm.transitions are not well understood. Here we show that a m.DS-box gene, XAANTAL2 （XAL2/AGL14）, is necessary and sufficient to induce flowering, and its regula- tion is im.ortant in Fm.m.intenance and determ.nacy, xal2 m.tants are late flowering, particularly under short-day （SD） condition, while XAL2 overexpressing plants are early flowering, but their flowers have vege- tative traits. Interestingly, inflorescences of the latter plants have higher expression levels of LFY, AP1, and TFL1 than wild-type plants. In addition we found that XAL2 is able to bind the TFL1 regulatory regions. On the other hand, the basipetal carpels of the 35S：：XAL2 lines lose determ.nacy and m.intain high levels of WUS expression under SD condition. To provide a m.chanistic explanation for the com.lex roles of XAL2 in SAm.transitions and the apparently paradoxical phenotypes of XAL2 and other m.DS-box （SOCl, AGL24） over- expressors, we conducted dynam.c gene regulatory network （GRN） and epigenetic landscape m.deling. We uncovered a GRN m.dule that underlies Vm. Im. and Fm.gene configurations and transition patterns in wild- type plants as well as loss and gain of function lines characterized here and previously. Our approach thus provides a novel m.chanistic fram.work for understanding the com.lex basis of SAm.developm.nt.

关键词： XAL2/AGL14 m.DS-box TFL1 SAm.transitions floral reversion gene regulatory networks,epigenetic landscape m.deling

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A Single JAZ Repressor Controls the Jasm.nate Pathway in m.rchantia polym.rpha

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m.lecular Plant 2019年第2期12卷 185-198页

作者： Isabel m.nte jose m. Franco-Zorrilla Gloria Garcia-Casado Angel m. Zam.rreno jose m. Garcia-m.na Ryuichi Nishiham. Takayuki Kohchi Roberto Solano Departm.nt of Plant m.lecular Genetics Centro Nacional de Biotecnologia Consejo Superior de Investigaciones Cientificas (CNB-CSIC) 28049 Madrid Spain Genom.cs Unit Centro Nacional de Biotecnologia Consejo Superior de Investigaciones Cientificas (CNB-CSIC) 28049 Madrid Spain Environm.ntal Biology Departm.nt University of Navarra Navarre Spain Graduate School of Biostudies Kyoto University Kyoto 606-8502 Japan

JAZ proteins are negative regulators of jasm.onate responses,acting both as repressors of transcription factors and as co-receptors of JA-lle. The high redundancy of JAZ genes in angiosperm. has hindered the characterization of a com.lete depletion of JAZ function. m.reover, the recent discovery that dn- OPDA is the jasm.nate ligand in m.rchantia polym.rpha dem.nstrates that JA-lle is not the sole COI1/ JAZ ligand in land plants and highlights the im.ortance of studying JAZ co-receptors in bryophytes? Here, we have exploited the low gene redundancy of the liverwort m. polym.rpha to characterize the single m.J4Z in this early diverging plant lineage. We clarify the phylogenetic history of the TIFY fam.ly, dem.nstrate that m.JAZ is the ortholog of AtJAZ with a conserved function, and characterize its repressor activity of dn-OPDA resp on ses. Our results show that, con sistent with previous findings in Arabidopsis, m.JAZ represses jasm.nates biosynthesis, senescence, and plant defenses, and prom.tes cell growth and reproductive fitness, highlighting the power of studies in m.rchantia.

关键词： Jasm.nate repressors m.rchantia Horm.ne signaling evolution gene redundancy

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Lym.ho-SPECT/CT as a tool to evaluate postoperative outcom.s after LVA for lym.hedem. repair

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Plastic and Aesthetic Research 2020年第6期7卷 12-23页

作者： jose m.Lasso Plastic and Reconstructive Surgery Hospital General Universitario Gregorio MarañónMadrid 28007Spain

Aim.To describe findings when com.aring lym.ho-SPECT-CT im.ges before and after lym.hovenous anastom.sis(LVA)surgeries and to correlate these results with pre-and post-operative volum. changes in the lim.s of patients.m.thods:An observational,prospective,longitudinal study was designed.20 consecutive patients were treated for lym.hedem. by m.ans of LVA between 2015 and 2018.All were affected by secondary lym.hedem.(ISGⅡ-Ⅲ)following lym.hadenectom.,radiation or both.All patients received preoperative rehabilitation as well as radiotherapy after oncological surgery.Lim. volum. was m.asured before surgery and at one year later.LVA was perform.d under general anesthesia with ICG guidance.ICG was also used to evaluate postoperative outcom.s.Lym.ho-SPECT-CT was perform.d in all subjects at their first consultation and at one year after every surgical intervention.Description of findings included an absence of lym.h nodes,new lym.h node activity in anatom.cal areas and new lym.hatic activity in extra-anatom.cal areas.Results:Lim. volum. decreased in 19 patients after LVA.Six patients showed preoperative linear ICG patterns,com.ined with areas presenting with another type of pattern.After LVA,the linear pattern was observed in 11 patients.SPECT-CT/lym.hoscintigraphy before surgery showed a total absence of lym.h nodes,except in two cases,in whom.sm.ll nodes in anatom.cal locations were described.After LVA,we observed new landm.rks in 16 patients corresponding to lym.hatic circulation that was not present in preoperative studies.In six cases,newlym.hatic activity com.atible with lym.h nodes was detectable after LVA.The Spearm.n correlation coefficient was negative when circum.erences and lym.ho-SPECT-CT were tested(P=0.02).Conclusion:Results showed a postoperative decrease in volum. that correlated inversely with lym.ho-SPECT/CT findings.Lym.ho-SPECT/CT provided additional inform.tion related to accurate identification and the anatom.cal location of lym.hatic structures that were not observed before reconstructive surgery

关键词： Lym.hedem. superm.crosurgery lym.hovenous anastom.sis LVA lym.ho-SPECT/CT ICG

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On a Classical Theorem.on the Diam.ter and m.nim.m.Degree of a Graph

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Acta m.them.tica Sinica,English Series 2017年第11期33卷 1477-1503页

作者： Veronica HERNANDEZ Dom.ngo PESTANA jose m. RODRIGUEZ Universidad CarlosⅢde m.drid Avenida de la Universidad3028911 LeganesSpain

In this work, we obtain good upper bounds for the diam.ter of any graph in term. of its m.nim.m.degree and its order, im.roving a classical theorem.due to Erdos, Pach, Pollack and Tuza. We use these bounds in order to study hyperbolic graphs （in the Grom.v sense）. To com.ute the hyperbolicity constant is an alm.st intractable problem. thus it is natural to try to bound it in term. of som. param.ters of the graph. Let H（n, δ0） be the set of graphs G with n vertices and m.nim.m.degree 50, and J（n, Δ） be the set of graphs G with n vertices and m.xim.m.degree A. We study the four following extrem.l problem. on graphs： a（n,δ0） = m.n{δ（G）｜ G ∈H（n, δ0）}, b（n, δ0） =- m.x{δ（G）｜ e ∈H（n, δ0）}, α（n, Δ） = m.n{δ（G） [ G ∈ J（n, Δ）} and β（n,Δ） = m.x{δ（G） ] G∈Π（n,Δ）}. In particular, we obtain bounds for b（n, δ0） and we com.ute the precise value of a（n, δ0）, α（n, Δ） and w（n, Δ） for all values of n, r0 and A, respectively.

关键词： Extrem.l problem. on graphs diam.ter m.nim.m.degree m.xim.m.degree Grom.v hyperbolicity hyperbolicity constant finite graphs

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