A refined atomic model for microsomal glutathione transferase 1 from electron crystallography

• Microsomal glutathione transferase 1 (MGST1) is a detoxification enzyme belonging to the Membrane Associated Proteins in Eicosanoid and Glutathione Metabolism (MAPEG) superfamily. Here we have used electron crystallography of two-dimensional (2D) crystals in order to determine an atomic model of rat MGST1 in a lipid environment. The 2D crystals were of the p6 two-sided plane group symmetry. For the refinement, information to 3.5 Å resolution from 225 electron diffraction patterns recorded from specimens at tilt angles up to 66° was used. The model comprises 123 of the 155 amino acid residues, two structured phospholipid molecules, two hydrocarbon chains, and one glutathione (GSH) molecule. Interactions between subunits form trimers centered on the crystallographic three-fold axes of the unit cell. The GSH substrate binds in an extended conformation at the interface between two subunits of the trimer. The location of GSH is supported by mutagenesis data in vitro.

Ämnesord

NATURVETENSKAP  -- Biologi -- Strukturbiologi (hsv//swe)

NATURAL SCIENCES  -- Biological Sciences -- Structural Biology (hsv//eng)

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