Abstract:
:YUCCA (YUC) proteins constitute a family of flavin monooxygenases (FMOs), with an important role in auxin (IAA) biosynthesis. Here we report that Arabidopsis plants overexpressing YUC6 display enhanced IAA-related phenotypes and exhibit improved drought stress tolerance, low rate of water loss and controlled ROS accumulation under drought and oxidative stresses. Co-overexpression of an IAA-conjugating enzyme reduces IAA levels but drought stress tolerance is unaffected, indicating that the stress-related phenotype is not based on IAA overproduction. YUC6 contains a previously unrecognized FAD- and NADPH-dependent thiol-reductase activity (TR) that overlaps with the FMO domain involved in IAA biosynthesis. Mutation of a conserved cysteine residue (Cys-85) preserves FMO but suppresses TR activity and stress tolerance, whereas mutating the FAD- and NADPH-binding sites, that are common to TR and FMO domains, abolishes all outputs. We provide a paradigm for a single protein playing a dual role, regulating plant development and conveying stress defence responses.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Cha JY,Kim WY,Kang SB,Kim JI,Baek D,Jung IJ,Kim MR,Li N,Kim HJ,Nakajima M,Asami T,Sabir JS,Park HC,Lee SY,Bohnert HJ,Bressan RA,Pardo JM,Yun DJdoi
10.1038/ncomms9041subject
Has Abstractpub_date
2015-08-28 00:00:00pages
8041issn
2041-1723pii
ncomms9041journal_volume
6pub_type
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