Specificity of the E. coli LysR-type transcriptional regulators.

Specificity of the E. coli LysR-type transcriptional regulators.
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DOI:
10.1371/journal.pone.0015189
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发表时间:
2010-12-20
期刊:
影响因子:
3.7
通讯作者:
Hu JC
Hu JC
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Knapp GS;Hu JC

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同源寡聚蛋白家族在生物学中很常见。组装的特异性是如何进化的是生物学的一个基本问题。lysr型转录调节剂(LTTR)可能是细菌中最大的转录调节剂家族。由于基因组通常编码许多ltr家族成员,因此假设许多不同的同聚物在同一细胞中同时形成,而不干扰彼此的活动,这表明相互作用具有特异性。然而,这一假设尚未得到系统的验证。利用λcI抑制因子融合的负优势实验评估了LTTRs在大肠杆菌K-12中的组装。硫氧还蛋白(Trx)-LTTR融合物被用来挑战λcI-LTTR融合物的同聚物相互作用。8个ci - ltr融合体被28个Trx融合体挑战。根据ltr与其他ltr的相互作用,ltr可分为三类。大肠杆菌K-12中LTTRs的多聚性主要是特异性的。然而,在分析条件下,许多lttr与不止一个非同源伴侣相互作用。这些相互作用的生理意义和物理基础尚不清楚。
Families of paralogous oligomeric proteins are common in biology. How the specificity of assembly evolves is a fundamental question of biology. The LysR-Type Transcriptional Regulators (LTTR) form perhaps the largest family of transcriptional regulators in bacteria. Because genomes often encode many LTTR family members, it is assumed that many distinct homooligomers are formed simultaneously in the same cell without interfering with each other's activities, suggesting specificity in the interactions. However, this assumption has not been systematically tested. A negative-dominant assay with λcI repressor fusions was used to evaluate the assembly of the LTTRs in E. coli K-12. Thioredoxin (Trx)-LTTR fusions were used to challenge the homooligomeric interactions of λcI-LTTR fusions. Eight cI-LTTR fusions were challenged with twenty-eight Trx fusions. LTTRs could be divided into three classes based on their interactions with other LTTRs. Multimerization of LTTRs in E. coli K-12 is mostly specific. However, under the conditions of the assay, many LTTRs interact with more than one noncognate partner. The physiological significance and physical basis for these interactions are not known.
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