An atypical receiver domain controls the dynamic polar localization of the Myxococcus xanthus social motility protein FrzS.

An atypical receiver domain controls the dynamic polar localization of the Myxococcus xanthus social motility protein FrzS.
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DOI:
10.1111/j.1365-2958.2007.05785.x
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发表时间:
2007-07
影响因子:
3.6
通讯作者:
Alber T
Alber T
中科院分区:
生物学2区
文献类型:
--
作者:
Fraser JS;Merlie JP Jr;Echols N;Weisfield SR;Mignot T;Wemmer DE;Zusman DR;Alber T

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黄色粘球菌FrzS蛋白在细胞内从一个极点转移到另一个极点,在极点积累,这决定了社交运动的方向。在这里,我们使用原子分辨率晶体学和NMR表明,FrzS接收器结构域(RD)以不寻常的构象显示保守的开关Tyr 102,缺乏保守的Asp磷酸化位点,并且不能结合Mg 2+或磷酰基类似物Mg 2+·BeF 3。最接近RD磷酸化的典型位点的Asp 55的突变在体内没有显示运动表型,表明在该位点的磷酸化对于结构域功能不是必需的。与此相反,Tyr 102 Ala和His 92 Phe取代的典型输出面的FrzS RD废除S-运动在体内。单细胞荧光显微镜测量结果显示,这些突变FrzS蛋白在体内的拖尾细胞极的一个惊人的错误定位。突变体的晶体结构表明,在野生型FrzS RD中观察到的Tyr 102构象不足以发挥功能。这些结果支持的模型,FrzS包含一个新的“伪接收域”,其功能需要识别的RD输出面,但不Asp磷酸化。
The Myxococcus xanthus FrzS protein transits from pole-to-pole within the cell, accumulating at the pole that defines the direction of movement in social (S) motility. Here we show using atomic-resolution crystallography and NMR that the FrzS receiver domain (RD) displays the conserved switch Tyr102 in an unusual conformation, lacks the conserved Asp phosphorylation site, and fails to bind Mg2+ or the phosphoryl analogue, Mg2+·BeF3. Mutation of Asp55, closest to the canonical site of RD phosphorylation, showed no motility phenotype in vivo, demonstrating that phosphorylation at this site is not necessary for domain function. In contrast, the Tyr102Ala and His92Phe substitutions on the canonical output face of the FrzS RD abolished S-motility in vivo. Single-cell fluorescence microscopy measurements revealed a striking mislocalization of these mutant FrzS proteins to the trailing cell pole in vivo. The crystal structures of the mutants suggested that the observed conformation of Tyr102 in the wild-type FrzS RD is not sufficient for function. These results support the model that FrzS contains a novel ‘pseudo-receiver domain’ whose function requires recognition of the RD output face but not Asp phosphorylation.
DOI: 10.1016/j.jmb.2005.05.066
发表时间: 2005-08-12
影响因子: 5.6
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期刊: ACTA CRYSTALLOGRAPHICA SECTION D-BIOLOGICAL CRYSTALLOGRAPHY
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作者:
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通讯作者: Warren, GL
DOI: 10.1073/pnas.87.1.41
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作者:
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