生物
普氏藻
赤霉素
基因
抑制因子
信号转导
分解代谢
遗传筛选
TOR信号
克隆(编程)
代谢途径
细胞生物学
遗传学
酶
生物化学
基因表达
突变体
计算机科学
程序设计语言
出处
期刊:Current Biology
[Elsevier]
日期:2011-05-01
卷期号:21 (9): R338-R345
被引量:464
标识
DOI:10.1016/j.cub.2011.02.036
摘要
Bioactive gibberellins (GAs) are diterpene phytohormones that modulate growth and development throughout the whole life cycle of the flowering plant. Impressive advances have been made in elucidating the GA pathway with the cloning and characterization of genes encoding most GA biosynthesis and catabolism enzymes, GA receptors (GIBBERELLIN INSENSITIVE DWARF1, GID1) and early GA signaling components. Recent biochemical, genetic and structural analyses demonstrate that GA de-represses its signaling pathway by GID1-induced degradation of DELLA proteins, which are master growth repressors, via a ubiquitin–proteasome pathway. Multiple endogenous signals and environmental cues also interact with the GA–GID1–DELLA regulatory module by affecting the expression of GA metabolism genes, and hence GA content and DELLA levels. Importantly, DELLA integrates different signaling activities by direct protein–protein interaction with multiple key regulatory proteins from other pathways. Comparative studies suggest that the functional GA–GID1–DELLA module is highly conserved among vascular plants, but not in the bryophytes. Interestingly, differentiation of the moss Physcomitrella patens is regulated by as yet unidentified ent-kaurene-derived diterpenes, which are distinct from the common active GAs in vascular plants. Bioactive gibberellins (GAs) are diterpene phytohormones that modulate growth and development throughout the whole life cycle of the flowering plant. Impressive advances have been made in elucidating the GA pathway with the cloning and characterization of genes encoding most GA biosynthesis and catabolism enzymes, GA receptors (GIBBERELLIN INSENSITIVE DWARF1, GID1) and early GA signaling components. Recent biochemical, genetic and structural analyses demonstrate that GA de-represses its signaling pathway by GID1-induced degradation of DELLA proteins, which are master growth repressors, via a ubiquitin–proteasome pathway. Multiple endogenous signals and environmental cues also interact with the GA–GID1–DELLA regulatory module by affecting the expression of GA metabolism genes, and hence GA content and DELLA levels. Importantly, DELLA integrates different signaling activities by direct protein–protein interaction with multiple key regulatory proteins from other pathways. Comparative studies suggest that the functional GA–GID1–DELLA module is highly conserved among vascular plants, but not in the bryophytes. Interestingly, differentiation of the moss Physcomitrella patens is regulated by as yet unidentified ent-kaurene-derived diterpenes, which are distinct from the common active GAs in vascular plants.
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