4GEI

N-terminal domain of VDUP-1

Summary for 4GEI

• Entry DOI: 10.2210/pdb4gei/pdb
• Related: 4GEJ
• Descriptor: Thioredoxin-interacting protein (2 entities in total)
• Functional Keywords: alpha-arrestin, oxidative stress, metabolism, thioredoxin, protein binding
• Biological source: Homo sapiens (human)
• Cellular location: Cytoplasm : Q9H3M7
• Total number of polymer chains: 1
• Total formula weight: 17048.43

Authors

Polekhina, G.,Kok, S.F.,Ascher, D.B.,Waltham, M. (deposition date: 2012-08-02, release date: 2013-02-27, Last modification date: 2024-04-03)

Primary citation

Polekhina, G.,Ascher, D.B.,Kok, S.F.,Beckham, S.,Wilce, M.,Waltham, M.
Structure of the N-terminal domain of human thioredoxin-interacting protein.
Acta Crystallogr.,Sect.D, 69:333-344, 2013

PubMed Abstract: Thioredoxin-interacting protein (TXNIP) is one of the six known α-arrestins and has recently received considerable attention owing to its involvement in redox signalling and metabolism. Various stress stimuli such as high glucose, heat shock, UV, H2O2 and mechanical stress among others robustly induce the expression of TXNIP, resulting in the sequestration and inactivation of thioredoxin, which in turn leads to cellular oxidative stress. While TXNIP is the only α-arrestin known to bind thioredoxin, TXNIP and two other α-arrestins, Arrdc4 and Arrdc3, have been implicated in metabolism. Furthermore, owing to its roles in the pathologies of diabetes and cardiovascular disease, TXNIP is considered to be a promising drug target. Based on their amino-acid sequences, TXNIP and the other α-arrestins are remotely related to β-arrestins. Here, the crystal structure of the N-terminal domain of TXNIP is reported. It provides the first structural information on any of the α-arrestins and reveals that although TXNIP adopts a β-arrestin fold as predicted, it is structurally more similar to Vps26 proteins than to β-arrestins, while sharing below 15% pairwise sequence identity with either.

PubMed: 23519408
DOI: 10.1107/S0907444912047099

Experimental method

X-RAY DIFFRACTION (1.5 Å)