SIR1, an Upstream Component in Auxin Signaling Identified by Chemical Genetics

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Science  22 Aug 2003:
Vol. 301, Issue 5636, pp. 1107-1110
DOI: 10.1126/science.1084161

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Auxin is a plant hormone that regulates many aspects of plant growth and development. We used a chemical genetics approach to identify SIR1, a regulator of many auxin-inducible genes. The sir1 mutant was resistant to sirtinol, a small molecule that activates many auxin-inducible genes and promotes auxin-related developmental phenotypes. SIR1 is predicted to encode a protein composed of a ubiquitin-activating enzyme E1–like domain and a Rhodanese-like domain homologous to that of prolyl isomerase. We suggest a molecular context for how the auxin signal is propagated to exert its biological effects.

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