The structure of the karrikin-insensitive protein (KAI2) in Arabidopsis thaliana.

The structure of the karrikin-insensitive protein (KAI2) in Arabidopsis thaliana.
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DOI:
10.1371/journal.pone.0054758
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Bond CS
Bond CS
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Bythell-Douglas R;Waters MT;Scaffidi A;Flematti GR;Smith SM;Bond CS

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Karrikin Insensitive 2(KAI 2)是一种参与种子萌发和幼苗发育的α/β水解酶。它对于植物对karrikins的反应是必不可少的,karrikins是一类从燃烧的植物材料中衍生的丁烯酰化合物,其结构类似于独脚金内酯植物激素。KAI 2在植物发育中的作用机制尚不清楚。我们测定了拟南芥KAI 2的晶体结构,空间群分别为P21 21 21(a = 63.57,B = 66.26,c = 78.25)和P21(a = 50.20,B = 56.04,c = 52.43,β = 116.12°)至1.55和2.11。              催化残基位于一个大的疏水口袋内,类似于DAD 2(矮牵牛中独脚金内酯反应所需的蛋白质)。KAI 2具有第二个溶剂可接近的口袋,邻近活性位点空腔,这提供了变构调节的可能性。KAI 2的结构与其作为丝氨酸水解酶的名称一致,以及先前的数据表明该蛋白质参与karrikin和独脚金内酯信号传导。
KARRIKIN INSENSITIVE 2 (KAI2) is an α/β 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 P21 21 21 (a  = 63.57 Å, b  = 66.26 Å, c  = 78.25 Å) and P21 (a  = 50.20 Å, b  = 56.04 Å, c  = 52.43 Å, β  = 116.12°) to 1.55 and 2.11 Å 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.
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