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Crystal Structure of Get4-Get5 Complex and Its Interactions with Sgt2, Get3, and Ydj1*♦

By Yi-Wei Chang, Yu-Chien Chuang, Yu-Chi Ho, Ming-Yuan Cheng, Yuh-Ju Sun, Chwan-Deng Hsiao and Chung Wang

Abstract

Get3, Get4, and Get5 in Saccharomyces cerevisiae participate in the insertion of tail-anchored proteins into the endoplasmic reticulum membrane. We elucidated the interaction between Get4 and Get5 and investigated their interaction with Get3 and a tetratricopeptide repeat-containing protein, Sgt2. Based on co-immunoprecipitation and crystallographic studies, Get4 and Get5 formed a tight complex, suggesting that they constitute subunits of a larger complex. In contrast, although Get3 interacted physically with the Get4-Get5 complex, low amounts of Get3 co-precipitated with Get5, implying a transient interaction between Get3 and Get4-Get5. Sgt2 also interacted with Get5, although the amount of Sgt2 that co-precipitated with Get5 varied. Moreover, GET3, GET4, and GET5 interacted genetically with molecular chaperone YDJ1, suggesting that chaperones might also be involved in the insertion of tail-anchored proteins

Topics: Protein Structure and Folding
Publisher: American Society for Biochemistry and Molecular Biology
OAI identifier: oai:pubmedcentral.nih.gov:2843242
Provided by: PubMed Central
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