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Dynamic allostery in the ring protein TRAP

机译:环蛋白TRAP中的动态变构

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We have discovered distinct, characteristic differences in the thermodynamic signatures of tryptophan binding by trp RNA-binding attenuation protein (TRAP) from two different bacterial species. The TRAP 11mer ring binds 11 molecules of tryptophan at symmetry-related sites. Tryptophan binding to Bacillus stearothermophilus TRAP is not cooperative, but isothermal titration calorimetry shows that filling the first tryptophan binding sites of Bacillus subtilis TRAP has a marked effect on the thermodynamics of subsequent ligand binding. We have identified a single, conservative amino acid replacement (Ile to Leu) in B. subtilis TRAP that abolishes this effect, and suggest the initial ligand binding causes a change throughout the wildtype protein ring. (c) 2007 Elsevier Ltd. All rights reserved.
机译:我们已经发现了来自两个不同细菌物种的trp RNA结合衰减蛋白(TRAP)在色氨酸结合的热力学特征中存在明显的特征差异。 TRAP 11mer环在对称相关位点结合11个色氨酸分子。色氨酸与嗜热脂肪芽孢杆菌TRAP的结合不合作,但等温滴定量热法显示,填充枯草芽孢杆菌TRAP的第一个色氨酸结合位点对随后的配体结合的热力学有显着影响。我们已在枯草芽孢杆菌TRAP中鉴定了一个单一的,保守的氨基酸置换(Ile至Leu),从而消除了这种影响,并建议初始配体结合会导致整个野生型蛋白环发生变化。 (c)2007 Elsevier Ltd.保留所有权利。

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