6BEV

Human Single Domain Sulfurtranferase TSTD1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.043 Å
  • R-Value Free: 0.144 
  • R-Value Work: 0.130 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Thiosulfate sulfurtransferase-like domain-containing 1 protein interacts with thioredoxin.

Libiad, M.Motl, N.Akey, D.L.Sakamoto, N.Fearon, E.R.Smith, J.L.Banerjee, R.

(2018) J. Biol. Chem. 293: 2675-2686

  • DOI: 10.1074/jbc.RA117.000826

  • PubMed Abstract: 
  • Rhodanese domains are structural modules present in the sulfurtransferase superfamily. These domains can exist as single units, in tandem repeats or fused to domains with other activities. Despite their prevalence across species, the specific physiol ...

    Rhodanese domains are structural modules present in the sulfurtransferase superfamily. These domains can exist as single units, in tandem repeats or fused to domains with other activities. Despite their prevalence across species, the specific physiological roles of most sulfurtransferases are not known. Mammalian rhodanese and mercaptopyruvate sulfurtransferase are perhaps the best-studied members of this protein superfamily and are involved in hydrogen sulfide metabolism. The relatively unstudied human thiosulfate sulfurtransferase like domain-containing 1 (TSTD1) protein, a single-domain cytoplasmic sulfurtransferase, was also postulated to play a role in the sulfide oxidation pathway using thiosulfate to form glutathione persulfide, for subsequent processing in the mitochondrial matrix. Prior kinetic analysis of TSTD1 was performed at pH 9.2, raising questions about relevance and the proposed model for TSTD1 function. In this study, we report a 1.04 Å resolution crystal structure of human TSTD1, which displays an exposed active site that is distinct from that of rhodanese and mercaptopyruvate sulfurtransferase. Kinetic studies with a combination of sulfur donors and acceptors reveal that TSTD1 exhibits a low KM for thioredoxin as a sulfane sulfur acceptor and that it utilizes thiosulfate inefficiently as a sulfur donor. The active site exposure and its interaction with thioredoxin, suggest that TSTD1 might play a role in sulfide-based signaling. The apical localization of TSTD1 in human colonic crypts, which interfaces with sulfide-releasing microbes, and the overexpression of TSTD1 in colon cancer, provides potentially intriguing clues as to its role in sulfide metabolism.


    Organizational Affiliation

    University of Michigan, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Thiosulfate sulfurtransferase/rhodanese-like domain-containing protein 1
A, B
135Homo sapiensMutation(s): 0 
Gene Names: TSTD1 (KAT)
EC: 2.8.1.-
Find proteins for Q8NFU3 (Homo sapiens)
Go to Gene View: TSTD1
Go to UniProtKB:  Q8NFU3
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.043 Å
  • R-Value Free: 0.144 
  • R-Value Work: 0.130 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 37.903α = 113.31
b = 40.246β = 90.20
c = 47.201γ = 117.50
Software Package:
Software NamePurpose
XSCALEdata scaling
PHENIXrefinement
SOLVEphasing
PDB_EXTRACTdata extraction
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical SciencesUnited StatesGM112455
National Institutes of Health/National Institute of General Medical SciencesUnited StatesT32GM008353

Revision History 

  • Version 1.0: 2018-01-24
    Type: Initial release
  • Version 1.1: 2018-01-31
    Type: Database references
  • Version 1.2: 2018-02-14
    Type: Author supporting evidence
  • Version 1.3: 2018-03-07
    Type: Database references