Elucidating the catalytic subunit composition of distinct proteasome subtypes: a crosslinking approach employing bifunctional activity-based probes.

Elucidating the catalytic subunit composition of distinct proteasome subtypes: a crosslinking approach employing bifunctional activity-based probes.
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阐明不同蛋白酶体亚型的催化亚基组成:采用基于双功能活性的探针的交联方法。

DOI:
10.1002/cbic.201402491
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发表时间:
2015-01-19
期刊:
影响因子:
3.2
通讯作者:
Kim, Kyung-Bo
Kim, Kyung-Bo
中科院分区:
生物学3区
文献类型:
--
作者:
Carmony, Kimberly Cornish;Sharma, Lalit Kumar;Lee, Do-Min;Park, Ji Eun;Lee, Wooin;Kim, Kyung-Bo

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除了两种公认的蛋白酶体亚型(组成型蛋白酶体和免疫蛋白酶体)之外,越来越多的证据还表明存在含有非常规催化亚基混合物的中间蛋白酶体亚型。虽然它们似乎发挥着独特的生物学作用,但缺乏检测不同蛋白酶体亚型的实用方法限制了功能研究。在这里,我们报告了基于活性的探针的开发,该探针可交联完整蛋白酶体复合物内的两个催化亚基。交联亚基对的鉴定提供了蛋白酶体催化亚基组成的直接证据。使用这些探针,我们发现 U266 多发性骨髓瘤细胞含有包含 β1i 和 β2 的中间蛋白酶体,但不包含 β1 和 β2i,这与之前对其他细胞类型的发现一致。我们的双功能探针可用于各种生物环境中不同蛋白酶体亚型的功能研究。
In addition to two well-recognized proteasome subtypes—constitutive proteasomes and immunoproteasomes—mounting evidence also suggests the existence of intermediate proteasome subtypes containing unconventional mixtures of catalytic subunits. While they appear to play unique biological roles, the lack of practical methods for detecting distinct proteasome subtypes has limited functional investigations. Here, we report the development of activity-based probes that crosslink two catalytic subunits within intact proteasome complexes. Identification of the crosslinked subunit pairs provides direct evidence on the catalytic subunit composition of proteasomes. Using these probes, we found that U266 multiple myeloma cells contain intermediate proteasomes comprising both β1i and β2, but not β1 and β2i, consistent with previous findings with other cell types. Our bifunctional probes can be utilized in functional investigations of distinct proteasome subtypes in various biological settings.
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