文章基本信息

标题：K+ channel interactions detected by a genetic system optimized for systematic studies of membrane protein interactions
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作者：Petr Obrdlik ; Mohamed El-Bakkoury ; Tanja Hamacher 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2004
卷号：101
期号：33
页码：12242-12247
DOI：10.1073/pnas.0404467101
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：Organization of proteins into complexes is crucial for many cellular functions. However, most proteomic approaches primarily detect protein interactions for soluble proteins but are less suitable for membrane-associated complexes. Here we describe a mating-based split ubiquitin system (mbSUS) for systematic identification of interactions between membrane proteins as well as between membrane and soluble proteins. mbSUS allows in vivo cloning of PCR products into a vector set, detection of interactions via mating, regulated expression of baits, and improved selection of interacting proteins. Cloning is simplified by introduction of {lambda} attachment sites for GATEWAY. Homo- and heteromeric interactions between Arabidopsis K+ channels KAT1, AKT1, and AKT2 were identified. Tests with deletion mutants demonstrate that the C terminus of KAT1 and AKT1 is necessary for physical assembly of complexes. Screening of a sorted collection of 84 plant proteins with K+ channels as bait revealed differences in oligomerization between KAT1, AKT1, and AtKC1, and allowed detection of putative interacting partners of KAT1 and AtKC1. These results show that mbSUS is suited for systematic analysis of membrane protein interactions.
关键词：split ubiquitin ; proteomics ; KAT1 ; Arabidopsis ; GATEWAY