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首页> 外文期刊>Current Biology: CB >The Auxin-Regulated CrRLK1L Kinase ERULUS Controls Cell Wall Composition during Root Hair Tip Growth
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The Auxin-Regulated CrRLK1L Kinase ERULUS Controls Cell Wall Composition during Root Hair Tip Growth

机译:植物管制调节的CRRLK1L激酶雾化在根毛尖端生长期间控制细胞壁组合物

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摘要

Root hairs facilitate a plant's ability to acquire soil anchorage and nutrients. Root hair growth is regulated by the plant hormone auxin and dependent on localized synthesis, secretion, and modification of the root hair tip cell wall. However, the exact cell wall regulators in root hairs controlled by auxin have yet to be determined. In this study, we describe the characterization of ERULUS (ERU), an auxin-induced Arabidopsis receptor-like kinase, whose expression is directly regulated by ARF7 and ARF19 transcription factors. ERU belongs to the Catharanthus roseus RECEPTOR-LIKE KINASE 1-LIKE (CrRLK1L) subfamily of putative cell wall sensor proteins. Imaging of a fluorescent fusion protein revealed that ERU is localized to the apical root hair plasma membrane. ERU regulates cell wall composition in root hairs and modulates pectin dynamics through negative control of pectin methylesterase (PME) activity. Mutant eru (-/-) root hairs accumulate de-esterified homogalacturonan and exhibit aberrant pectin Ca2+-binding site oscillations and increased PME activity. Up to 80% of the eru root hair phenotype is rescued by pharmacological supplementation with a PME-inhibiting catechin extract. ERU transcription is altered in specific cell wall-related root hair mutants, suggesting that it is a target for feedback regulation. Loss of ERU alters the phosphorylation status of FERONIA and H+-ATPases 1/2, regulators of apoplastic pH. Furthermore, H+-ATPases 1/2 and ERU are differentially phosphorylated in response to auxin. We conclude that ERULUS is a key auxin-controlled regulator of cell wall composition and pectin dynamics during root hair tip growth.
机译:根毛促能够植物获得土壤锚地和营养素的能力。根毛生长受植物激素毒素调节,并依赖于根毛尖端细胞壁的局部合成,分泌和改性。然而,尚未确定由制冷素控制的根毛中的确切的细胞壁调节剂。在这项研究中,我们描述了Eruly(ERU)的表征,一种肿瘤诱导的拟南芥受体样激酶,其表达由ARF7和ARF19转录因子直接调节。 ERU属于托管核心类激酶1样(CRRLK1L)亚家族推定的细胞壁传感器蛋白。荧光融合蛋白的成像表明ERU局部局部化为顶发的根膜膜。 ERU调节根毛中的细胞壁组合物,通过对果胶甲基酯酶(PME)活性的阴性控制来调节果胶动力学。突变体ERU( - / - )根毛累积去酯化的同态肌炎,表现出异常果胶CA2 + - 桥接位点振荡和增加的PME活性。通过用PME抑制的儿茶素提取物通过药理补充,可以拯救高达80%的ERU根毛发表型。 ERU转录在特定的细胞壁相关的根发突变体中改变,表明它是反馈调节的靶标。 ERU的丧失改变了Feronia和H + -ATPases的磷酸化状态1/2,妊娠期pH的调节剂。此外,H + -ATPases 1/2和ERU响应于植物蛋白而差异磷酸化。我们得出结论,Eruly是在根毛尖端生长过程中的细胞壁组合物和果胶动力学的关键植物蛋白控制调节剂。

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  • 来源
    《Current Biology: CB》 |2018年第5期|共17页
  • 作者单位

    Univ Antwerp Dept Biol Integrated Mol Plant Physiol Res Groenenborgerlaan 171 B-2020 Antwerp Belgium;

    Univ Antwerp Dept Biol Integrated Mol Plant Physiol Res Groenenborgerlaan 171 B-2020 Antwerp Belgium;

    Univ Bristol Sch Biol Sci Bristol BS8 1UG Avon England;

    Univ Nottingham Sch Biosci Ctr Plant Integrat Biol Sutton Bonington Campus Loughborough LE12 5RD Leics England;

    Univ Antwerp Dept Biol Integrated Mol Plant Physiol Res Groenenborgerlaan 171 B-2020 Antwerp Belgium;

    AgroParisTech Inst Jean Pierre Bourgin INRA CNRS Saclay Plant Sci UMR1318 ERL3559 Route St Cyr F-78026 Versailles France;

    Univ Nottingham Sch Biosci Ctr Plant Integrat Biol Sutton Bonington Campus Loughborough LE12 5RD Leics England;

    Univ Nottingham Sch Biosci Ctr Plant Integrat Biol Sutton Bonington Campus Loughborough LE12 5RD Leics England;

    Univ Nottingham Sch Biosci Ctr Plant Integrat Biol Sutton Bonington Campus Loughborough LE12 5RD Leics England;

    Univ Ghent Dept Plant Biotechnol &

    Bioinformat B-9052 Ghent Belgium;

    Univ Ghent Dept Plant Biotechnol &

    Bioinformat B-9052 Ghent Belgium;

    Univ Ghent Dept Plant Biotechnol &

    Bioinformat B-9052 Ghent Belgium;

    Univ Nottingham Sch Biosci Ctr Plant Integrat Biol Sutton Bonington Campus Loughborough LE12 5RD Leics England;

    Univ Antwerp Dept Vet Sci Lab Cell Biol &

    Histol Univ Pl 1 B-2610 Antwerp Belgium;

    Univ Antwerp Dept Vet Sci Lab Cell Biol &

    Histol Univ Pl 1 B-2610 Antwerp Belgium;

    Univ Antwerp Dept Vet Sci Lab Cell Biol &

    Histol Univ Pl 1 B-2610 Antwerp Belgium;

    Univ Bristol Sch Biol Sci Bristol BS8 1UG Avon England;

    Univ Nottingham Sch Biosci Ctr Plant Integrat Biol Sutton Bonington Campus Loughborough LE12 5RD Leics England;

    Univ Antwerp Dept Biol Integrated Mol Plant Physiol Res Groenenborgerlaan 171 B-2020 Antwerp Belgium;

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  • 正文语种 eng
  • 中图分类 生物科学;
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