How to switch off a histidine kinase: crystal structure of Geobacillus stearothermophilus KinB with the inhibitor Sda.

How to switch off a histidine kinase: crystal structure of Geobacillus stearothermophilus KinB with the inhibitor Sda.
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DOI:
10.1016/j.jmb.2008.12.006
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发表时间:
2009-02-13
影响因子:
5.6
通讯作者:
Darst, Seth A.
Darst, Seth A.
中科院分区:
生物学2区
文献类型:
--
作者:
Bick, Matthew J.;Lamour, Valerie;Rajashankar, Kanagalaghatta R.;Gordiyenko, Yuliya;Robinson, Carol V.;Darst, Seth A.

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进入芽孢杆菌中的孢子形成由组氨酸激酶磷酸化介导,这是原核生物中主要信号转导机制的一种变体。SDA直接抑制孢子形成组氨酸激酶对DNA损伤和复制缺陷的反应。我们确定了与Sda复合的嗜热脂肪土芽孢杆菌孢子形成激酶KinB的完整细胞质催化核心(包括连接到ATP结合催化或CA结构域的二聚化和组氨酸磷酸转移或DHp结构域)的2.0 nm分辨率X射线晶体结构。结构和生物化学分析表明,Sda结合到DHp结构域的基础上,并防止与DHp结构域的分子交易,它是作为一个简单的分子屏障结合。SDA的作用是在空间上阻断CA和DHp结构域之间的通讯,这是自磷酸化所必需的,以及在空间上阻断反应调节剂Spo0F和DHp结构域之间的通讯,这是磷酸转移和磷酸酶活性所必需的。
Entry to sporulation in Bacilli is governed by a histidine kinase phosphorelay, a variation on the predominant signal transduction mechanism in prokaryotes. Sda directly inhibits sporulation histidine kinases in response to DNA damage and replication defects. We determined a 2.0 Å-resolution X-ray crystal structure of the intact cytoplasmic catalytic core (comprising the Dimerization and Histidine-phosphotransfer, or DHp, domain, connected to the ATP-binding Catalytic, or CA, domain) of the Geobacillus stearothermophilus sporulation kinase KinB complexed with Sda. Structural and biochemical analyses reveal that Sda binds to the base of the DHp domain and prevents molecular transactions with the DHp domain to which it is bound by acting as a simple molecular barricade. Sda acts to sterically block communication between the CA and DHp domains required for autophosphorylation, as well as to sterically block communication between the response regulator Spo0F and DHp domain required for phosphotransfer and phosphatase activities.
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