Crystal structure of a geranylgeranyl bacteriochlorophyll reductase-like (Ta0516) from Thermoplasma acidophilum at 1.60 A resolution

Joint Center for Structural Genomics (JCSG)

(2R)-3-{[(R)-{[(2S)-2,3-dihydroxypropyl]oxy}(hydroxy)phosphoryl]oxy}-2-[(6Z)-tridec-6-enoyloxy]propyl (9Z)-octadec-9-enoate

Insights into substrate specificity of geranylgeranyl reductases revealed by the structure of digeranylgeranylglycerophospholipid reductase, an essential enzyme in the biosynthesis of archaeal membrane lipids.

Digeranylgeranylglycerophospholipid reductase

DGGGPL reductase, 2,3-di-O-geranylgeranylglyceryl phosphate reductase, Geranylgeranyl reductase, GGR

15.00% Glycerol, 8.50% iso-Propanol, 17.00% PEG-4000, 0.1M HEPES pH 7.5, NANODROP, VAPOR DIFFUSION, SITTING DROP, temperature 277K

THE CONSTRUCT WAS EXPRESSED WITH A PURIFICATION TAG MGSDKIHHHHHHENLYFQG. THE TAG WAS REMOVED WITH TEV PROTEASE LEAVING ONLY A GLYCINE FOLLOWED BY THE TARGET SEQUENCE.

1. HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS 2. A MET-INHIBITION PROTOCOL WAS USED FOR SELENOMETHIONINE INCORPORATION DURING PROTEIN EXPRESSION. THE OCCUPANCY OF THE SE ATOMS IN THE MSE RESIDUES WAS REDUCED TO 0.75 FOR THE REDUCED SCATTERING POWER DUE TO PARTIAL S-MET INCORPORATION. 3. ATOM RECORD CONTAINS SUM OF TLS AND RESIDUAL B FACTORS. ANISOU RECORD CONTAINS SUM OF TLS AND RESIDUAL U FACTORS. 4. WATERS WERE EXCLUDED FROM AUTOMATIC TLS ASSIGNMENT. 5. FAD IS MODELED BASED ON DENSITY AND FUNCTION. 6. A BACTERIAL LIPID FOUND IN THE ACTIVE SITE WAS TENTATIVELY ASSIGNED AS A PHOSPHATIDYLGYLCEROL (OZ2) BASED ON DENSITY AND FUNCTION. THE DENSITY FOR THE HEAD GROUP AND LIPID TAILS ARE POORLY DEFINED. 7. ETHYLENE GLYCOL (EDO) AND GLYCEROL (GOL) WERE MODELED BASED ON CRYSTALLIZATION/CYRO CONDITIONS.

STRUCTURAL GENOMICS, JOINT CENTER FOR STRUCTURAL GENOMICS, JCSG, PROTEIN STRUCTURE INITIATIVE, PSI-BIOLOGY, FLAVOPROTEIN, OXIDOREDUCTASE