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Title 

The structural basis for the negative regulation of thioredoxin by thioredoxin-interacting protein

Authors 

Jungwon HwangH W SuhY H JeonE HwangL T NguyenJ YeomSeung Goo LeeC LeeK J KimB S KangJ O JeongTae Kwang OhIn Pyo ChoiJ O LeeMyung Hee Kim

Publisher 

Nature Publishing Group

Issue Date 

2014

Citation 

Nature Communications, vol. 5, no. 0, pp. 2958-2958

Abstract 

The redox-dependent inhibition of thioredoxin (TRX) by thioredoxin-interacting protein (TXNIP) plays a pivotal role in various cancers and metabolic syndromes. However, the molecular mechanism of this regulation is largely unknown. Here, we present the crystal structure of the TRX-TXNIP complex and demonstrate that the inhibition of TRX by TXNIP is mediated by an intermolecular disulphide interaction resulting from a novel disulphide bond-switching mechanism. Upon binding to TRX, TXNIP undergoes a structural rearrangement that involves switching of a head-to-tail interprotomer Cys63-Cys247 disulphide between TXNIP molecules to an interdomain Cys63-Cys190 disulphide, and the formation of a de novo intermolecular TXNIP Cys247-TRX Cys32 disulphide. This disulphide-switching event unexpectedly results in a domain arrangement of TXNIP that is entirely different from those of other arrestin family proteins. We further show that the intermolecular disulphide bond between TRX and TXNIP dissociates in the presence of high concentrations of reactive oxygen species. This study provides insight into TRX and TXNIP-dependent cellular regulation.

ISSN 

2041-1723

Link 

http://dx.doi.org/10.1038/ncomms3958

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2017-04-19


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