Acetate → acryloyl-CoA

関与物質

反応手順

S-acetyl CoA synthetase (acetate thiokinase from bakers yeast, Sigma, Saint Louis, Mo., USA; catalogue No. 1765) (1.9 mg/ml) is added. Using the fed-batch approach meaning step-wise addition (feeding) of H-CoA, 15 μl aliquots of H-CoA are added after 5, 10, 15 and 20 minutes, raising the H-CoA concentration by 1 mM each time, and a further 5 mM ATP is added after 25 minutes. Samples are analysed for H-CoA by HPLC (Instrumentation: Agilent Technologies HP1090L with HP1100 Variable Wavelength UV Detector and Chemstation (rev. A.06.01) Data System; column: Luna C18 from Phenomenex, 25 cm×4.6 mm inner diameter, bead diameter 5 μm (No. 92); mobile phase: A: 25 mM ammonium formate (pH 7.0), B: methanol; gradient 5% B for 0 min, then to 30% B in 20 min; flow 1 ml/min (approximately 130 bar), oven temperature 40° C., Detector: UV at 210 nm; injection volume 5 μl, Run time 28 min; peaks are found at the following retention times: ATP approximately 3.710 min, Coenzyme A at approximately 10.554 min, acetyl CoA at approximately 14.457 min, acrylyl CoA at approximately 17.500 min, bisadduct at approximately 15.993 min). When no H-CoA is detected, further 15 μl aliquots of H-CoA are added after 80, 95, 110 and 120 minutes, again raising the H-CoA concentration by 1 mM each time. Further 15 μl aliquots of H-CoA are added after 145 and 155 minutes and sufficient ATP to raise the concentration by 5 mM is added after 150 minutes.

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