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Dinesh, D. C.; Calderón Villalobos, L. I. A.; Abel, S.; Structural Biology of Nuclear Auxin Action Trends Plant Sci. 21, 302-316, (2016) DOI: 10.1016/j.tplants.2015.10.019
Auxin coordinates plant development largely via hierarchical control of gene expression. During the past decades, the study of early auxin genes paired with the power of Arabidopsis genetics have unraveled key nuclear components and molecular interactions that perceive the hormone and activate primary response genes. Recent research in the realm of structural biology allowed unprecedented insight into: (i) the recognition of auxin-responsive DNA elements by auxin transcription factors; (ii) the inactivation of those auxin response factors by early auxin-inducible repressors; and (iii) the activation of target genes by auxin-triggered repressor degradation. The biophysical studies reviewed here provide an impetus for elucidating the molecular determinants of the intricate interactions between core components of the nuclear auxin response module.
Grubb, C. D.; Abel, S.; Glucosinolate metabolism and its control Trends Plant Sci. 11, 89-100, (2006) DOI: 10.1016/j.tplants.2005.12.006
Glucosinolates and their associated degradation products have long been recognized for their distinctive benefits to human nutrition and plant defense. Because most of the structural genes of glucosinolate metabolism have been identified and functionally characterized in Arabidopsis thaliana, current research increasingly focuses on questions related to the regulation of glucosinolate synthesis, distribution and degradation as well as to the feasibility of engineering customized glucosinolate profiles. Here, we highlight recent progress in glucosinolate research, with particular emphasis on the biosynthetic pathway and its metabolic relationships to auxin homeostasis. We further discuss emerging insight into the signaling networks and regulatory proteins that control glucosinolate accumulation during plant development and in response to environmental challenge.
Ticconi, C. A.; Abel, S.; Short on phosphate: plant surveillance and countermeasures Trends Plant Sci. 9, 548-555, (2004) DOI: 10.1016/j.tplants.2004.09.003
Metabolism depends on inorganic phosphate (Pi) as reactant, allosteric effector and regulatory moiety in covalent protein modification. To cope with Pi shortage (a common situation in many ecosystems), plants activate a set of adaptive responses to enhance Pi recycling and acquisition by reprogramming metabolism and restructuring root system architecture. The physiology of Pi starvation responses has become well understood, and so current research focuses on the initial molecular events that sense, transmit and integrate information about external and internal Pi status. Recent studies have provided evidence for Pi as a signaling molecule and initial insight into the coordination of Pi deficiency responses at the cellular and molecular level.