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The structure of the karrikin insensitive (KAI2) protein in Arabidopsis thalianaThe structure of the karrikin insensitive (KAI2) protein in Arabidopsis thaliana
Structural highlights
FunctionKAI2_ARATH Involved in seed germination and seedling development. Essential for plant responses to karrikins, a class of butenolide compounds, structurally similar to strigolactones, released from burning vegetation that stimulate seed germination and enhance seedling photomorphogenesis. KAI2 is not required for strigolactone-mediated responses, but MAX2 is necessary for responses to karrikins and strigolactones.[1] [2] [3] [4] Publication Abstract from PubMedKARRIKIN INSENSITIVE 2 (KAI2) is an alpha/beta hydrolase involved in seed germination and seedling development. It is essential for plant responses to karrikins, a class of butenolide compounds derived from burnt plant material that are structurally similar to strigolactone plant hormones. The mechanistic basis for the function of KAI2 in plant development remains unclear. We have determined the crystal structure of Arabidopsis thaliana KAI2 in space groups P2(1) 2(1) 2(1) (a = 63.57 A, b = 66.26 A, c = 78.25 A) and P2(1) (a = 50.20 A, b = 56.04 A, c = 52.43 A, beta = 116.12 degrees ) to 1.55 and 2.11 A respectively. The catalytic residues are positioned within a large hydrophobic pocket similar to that of DAD2, a protein required for strigolactone response in Petunia hybrida. KAI2 possesses a second solvent-accessible pocket, adjacent to the active site cavity, which offers the possibility of allosteric regulation. The structure of KAI2 is consistent with its designation as a serine hydrolase, as well as previous data implicating the protein in karrikin and strigolactone signalling. The Structure of the Karrikin-Insensitive Protein (KAI2) in Arabidopsis thaliana.,Bythell-Douglas R, Waters MT, Scaffidi A, Flematti GR, Smith SM, Bond CS PLoS One. 2013;8(1):e54758. doi: 10.1371/journal.pone.0054758. Epub 2013 Jan 18. PMID:23349965[5] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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