Identification of novel nuclear targets of human thioredoxin 1

Changgong Wu, Mohit Raja Jain, Qing Li, Shin Ichi Oka, Wenge Li, Ah Ng Tony Kong, Narayani Nagarajan, Junichi Sadoshima, William J. Simmons, Hong Li

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The dysregulation of protein oxidative post-translational modifications has been implicated in stress-related diseases. Trx1 is a key reductase that reduces specific disulfide bonds and other cysteine post-translational modifications. Although commonly in the cytoplasm, Trx1 can also modulate transcription in the nucleus. However, few Trx1 nuclear targets have been identified because of the low Trx1 abundance in the nucleus. Here, we report the large-scale proteomics identification of nuclear Trx1 targets in human neuroblastoma cells using an affinity capture strategy wherein a Trx1C35S mutant is expressed. The wild-type Trx1 contains a conserved C32XXC35 motif, and the C32 thiol initiates the reduction of a target disulfide bond by forming an intermolecular disulfide with one of the oxidized target cysteines, resulting in a transient Trx1-target protein complex. The reduction is rapidly consummated by the donation of a C35 proton to the target molecule, forming a Trx1 C32-C35 disulfide, and results in the concurrent release of the target protein containing reduced thiols. By introducing a point mutation (C35 to S35) in Trx1, we ablated the rapid dissociation of Trx1 from its reduction targets, thereby allowing the identification of 45 putative nuclear Trx1 targets. Unexpectedly, we found that PSIP1, also known as LEDGF, was sensitive to both oxidation and Trx1 reduction at Cys 204. LEDGF is a transcription activator that is vital for regulating cell survival during HIV-1 infection. Overall, this study suggests that Trx1 may play a broader role than previously believed that might include regulating transcription, RNA processing, and nuclear pore function in human cells.

Original languageEnglish (US)
Pages (from-to)3507-3518
Number of pages12
JournalMolecular and Cellular Proteomics
Volume13
Issue number12
DOIs
StatePublished - Dec 1 2014

Fingerprint

Thioredoxins
Disulfides
Transcription
Post Translational Protein Processing
Sulfhydryl Compounds
Cysteine
Cells
Nuclear Pore
Proteins
Neuroblastoma
Point Mutation
Proteomics
HIV Infections
Protons
HIV-1
Cell Survival
Oxidoreductases
Cytoplasm
RNA
Oxidation

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Analytical Chemistry

Cite this

Wu, C., Jain, M. R., Li, Q., Oka, S. I., Li, W., Kong, A. N. T., ... Li, H. (2014). Identification of novel nuclear targets of human thioredoxin 1. Molecular and Cellular Proteomics, 13(12), 3507-3518. https://doi.org/10.1074/mcp.M114.040931

Identification of novel nuclear targets of human thioredoxin 1. / Wu, Changgong; Jain, Mohit Raja; Li, Qing; Oka, Shin Ichi; Li, Wenge; Kong, Ah Ng Tony; Nagarajan, Narayani; Sadoshima, Junichi; Simmons, William J.; Li, Hong.

In: Molecular and Cellular Proteomics, Vol. 13, No. 12, 01.12.2014, p. 3507-3518.

Research output: Contribution to journalArticle

Wu, C, Jain, MR, Li, Q, Oka, SI, Li, W, Kong, ANT, Nagarajan, N, Sadoshima, J, Simmons, WJ & Li, H 2014, 'Identification of novel nuclear targets of human thioredoxin 1', Molecular and Cellular Proteomics, vol. 13, no. 12, pp. 3507-3518. https://doi.org/10.1074/mcp.M114.040931
Wu, Changgong ; Jain, Mohit Raja ; Li, Qing ; Oka, Shin Ichi ; Li, Wenge ; Kong, Ah Ng Tony ; Nagarajan, Narayani ; Sadoshima, Junichi ; Simmons, William J. ; Li, Hong. / Identification of novel nuclear targets of human thioredoxin 1. In: Molecular and Cellular Proteomics. 2014 ; Vol. 13, No. 12. pp. 3507-3518.
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