ISDA

Deposition Date 2016-06-09

Release Date 2017-02-01

Last Version Date 2023-09-27

Entry Detail

PDB ID:

5KEJ

Keywords:

TRANSFERASE

Title:

Crystallographic structure of the Tau class glutathione S-transferase MiGSTU in complex with S-hexyl-glutathione

Biological Source:

Source Organism:

Mangifera indica (Taxon ID: 29780)

Host Organism:

Escherichia coli

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.35 Å

R-Value Free:

0.22

R-Value Work:

0.18

R-Value Observed:

0.18

Space Group:

P 21 21 21

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Macromolecular Entities

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Tau class glutathione S-transferase
Chain IDs:A, B
Chain Length:229
Number of Molecules:2
Biological Source:Mangifera indica

UniProt ID:A0A1P8NWC2 Pfam ID:PF02798, PF00043

Ligand Molecules

GTX

PEG

Primary Citation

Insights into ligand binding to a glutathione S-transferase from mango: Structure, thermodynamics and kinetics.

Valenzuela-Chavira, I, Contreras-Vergara, C.A, Arvizu-Flores, A.A, Serrano-Posada, H, Lopez-Zavala, A.A, Garcia-Orozco, K.D, Hernandez-Paredes, J, Rudino-Pinera, E, Stojanoff, V, Sotelo-Mundo, R.R, Islas-Osuna, M.A.Show

Biochimie 135 35 45 (2017)

PMID: 28104507 DOI: 10.1016/j.biochi.2017.01.005

Abstact

We studied a mango glutathione S-transferase (GST) (Mangifera indica) bound to glutathione (GSH) and S-hexyl glutathione (GSX). This GST Tau class (MiGSTU) had a molecular mass of 25.5 kDa. MiGSTU Michaelis-Menten kinetic constants were determined for their substrates obtaining a Km, Vmax and kcat for CDNB of 0.792 mM, 80.58 mM min-1 and 68.49 s-1 respectively and 0.693 mM, 105.32 mM min-1 and 89.57 s-1, for reduced GSH respectively. MiGSTU had a micromolar affinity towards GSH (5.2 μM) or GSX (7.8 μM). The crystal structure of the MiGSTU in apo or bound to GSH or GSX generated a model that explains the thermodynamic signatures of binding and showed the importance of enthalpic-entropic compensation in ligand binding to Tau-class GST enzymes.

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