Structure determination of histidine decarboxylase from Lactobacillus 30a at 3.0 A resolution.

Structure determination of histidine decarboxylase from Lactobacillus 30a at 3.0 A resolution.
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以 3.0 A 分辨率测定乳杆菌 30a 的组氨酸脱羧酶的结构。

DOI:
10.1016/0022-2836(85)90204-9
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发表时间:
1985
影响因子:
5.6
通讯作者:
Hackert,ML
Hackert,ML
中科院分区:
生物学2区
文献类型:
--
作者:
Parks,EH;Ernst,SR;Hamlin,R;Xuong,NH;Hackert,ML

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用x射线衍射法测定了乳杆菌30a组氨酸脱羧酶的晶体结构,分辨率为3.0 Å。这种蛋白质是一种依赖丙酮醇的酶,是通过一种不寻常的自激活过程形成的。该结构是通过使用两个重原子衍生物的多个同构取代相计算的电子密度图确定的,并包括来自异常散射测量的贡献。根据28,805个独立反思,最终的平均得分为0.79。该分子具有(αβ) 6亚基组成,结晶在空间群I4 1 22中,a= b= 221.7 a、c= 107.1 a。每个不对称单元有1 (αβ) 3个半分子。(αβ) 6颗粒呈哑铃状,每个(αβ) 3单元近似为球形,直径约为65 Å。在(αβ) 3分子的3重轴周围有一个约30 Å深的大中心空腔。3倍相关活性位点口袋位于该空腔的底部周围,彼此相距约23 Å。每个(αβ)单元的内部部分位于两个(αβ) 3粒子之间的界面附近,主要由随机线圈和几个小的螺旋和片状区域组成。每个(αβ)单元的外部区域都有一个不寻常的结构,由两个重叠的、主要是反平行的β褶片组成,每一侧都有一个α-螺旋。中心腔的壁是由这种β-三明治结构的两条链和其中一条螺旋的3倍重复形成的。
The crystal structure of histidine decarboxylase from Lactobacillus 30a has been determined by X-ray diffraction methods to a resolution of 3.0 Å. This protein is a pyruvoyl-dependent enzyme that is formed by an unusual self-activation process. The structure was determined from an electron density map calculated using multiple isomorphous replacement phases from two heavy-atom derivatives and included contributions from anomalous scattering measurements. The final mean figure of merit was 0.79, based on 28,805 independent reflections. The molecule has an (αβ) 6 subunit composition and crystallizes in the space group I4 1 22 with a= b= 221.7 A ̊ and c= 107.1 A ̊. There is one (αβ) 3 half molecule per asymmetric unit. The (αβ) 6 particle is dumbbell-shaped, with each (αβ) 3 unit being approximately spherical, with a diameter of about 65 Å. There is a large central cavity approximately 30 Å deep around the molecular 3-fold axis of the (αβ) 3 unit. The 3-fold related active site pockets are located around the bottom of this cavity and are separated from each other by a distance of approximately 23 Å. The inner portion of each (αβ) unit, which lies near the interface between the two (αβ) 3 particles, consists mainly of random coil with several small helical and sheet regions. The outer region of each (αβ) unit has an unusual structure consisting of two overlapping, predominantly antiparallel β-pleated sheets, lined on each side by an α-helix. The walls of the central cavity are formed by the 3-fold repeat of two strands from this β-sandwich structure and one of the helices.
DOI: --
发表时间: 1982
期刊: The Journal of biological chemistry
影响因子: --
作者:
Vaaler,GL;Recsei,PA;Fox,JL;Snell,EE
通讯作者: Snell,EE
DOI: 10.1107/s0567739471000822
发表时间: 1971
期刊: Acta Crystallographica Section A
影响因子: --
作者:
G. Germain;P. Main
通讯作者: P. Main
蛋白质重原子衍生物中重原子参数的确定和细化使用无心反射的一些模型计算。
DOI: 10.1107/s0567740871005946
发表时间: 1971
期刊: Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry
影响因子: --
作者:
E. Dodson;M. Vijayan
通讯作者: M. Vijayan
DOI: 10.1107/s0567740878006135
发表时间: 1978
期刊: Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry
影响因子: --
作者:
K. Wilson
通讯作者: K. Wilson
DOI: 10.1016/0968-0004(77)90441-8
发表时间: 1977
影响因子: 13.8
作者:
E. Snell
通讯作者: E. Snell