ISDA

Entry Detail

PDB ID:

6T2T

Keywords:

Title:

Crystal structure of Drosophila melanogaster glutathione S-transferase epsilon 14 in complex with glutathione and 2-methyl-2,4-pentanediol

Biological Source:

Source Organism:

Drosophila melanogaster

Host Organism:

Escherichia coli

PDB Version:

Deposition Date:

2019-10-09

Release Date:

2020-01-29

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.30 Å

R-Value Free:

0.16

R-Value Work:

0.15

R-Value Observed:

0.15

Space Group:

P 42 21 2

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Description:Glutathione S-transferase E14
Chain IDs:A
Chain Length:238
Number of Molecules:1
Biological Source:Drosophila melanogaster

UniProt ID:Q7JYX0 Pfam ID:PF02798, PF00043

Ligand Molecules

GSH

MPD

Primary Citation

Structure and steroid isomerase activity of Drosophila glutathione transferase E14 essential for ecdysteroid biosynthesis.

Skerlova, J, Lindstrom, H, Gonis, E, Sjodin, B, Neiers, F, Stenmark, P, Mannervik, B.Show

Febs Lett. 594 1187 1195 (2020)

PMID: 31845319 DOI: 10.1002/1873-3468.13718

Abstact

Ecdysteroids are critically important for the formation of the insect exoskeleton. Cholesterol is a precursor of ecdysone and its active form 20-hydroxyecdysone, but some steps in the ecdysteroid biosynthesis pathway remain unknown. An essential requirement of glutathione (GSH) transferase GSTE14 in ecdysteroid biosynthesis has been established in Drosophila melanogaster, but its function is entirely unknown. Here, we have determined the crystal structure of GSTE14 in complex with GSH and investigated the kinetic properties of GSTE14 with alternative substrates. GSTE14 has high-ranking steroid double-bond isomerase activity, albeit 50-fold lower than the most efficient mammalian GSTs. Corresponding steroid isomerizations are unknown in insects, and their exact physiological role remains to be shown. Nonetheless, the essential enzyme GSTE14 is here demonstrated to be catalytically competent and have a steroid-binding site.

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Primary Citation of related structures