Abstract
We purified and characterized a membrane-associated enzyme system from radish (Raphanus sativus L.) that is capable of converting acetyl-CoA into 3-hydroxy-3-methylglutaryl-coenzyme A (HMG-CoA). The enzyme system apparently comprises acetoacetyl-CoA thiolase (EC 2.3.1.9) and HMG-CoA synthase (EC 4.1.3.5). Its activityin vitro can be strongly stimulated by FeII. When ferrous ions are applied chelated with ethylenediaminetetraacetate, citrate or adenosine 5′-triphosphate (ATP), the stimulation is further increased. Stimulation is due to a higher catalytic efficiency as indicated by an increase in Vmax, whereas the affinity of the enzyme towards acetyl-CoA remains constant (Km=6 μM). A considerable portion of HMG-CoA lyase activity is associated with the same membranes. HMG-CoA lyase (EC 4.1.3.4) is also solubilized and partially co-purified. Its activity requires comparatively high concentrations of Mg2+. The conversion of HMG-CoA to mevalonic acid is catalyzed by HMG-CoA reductase (EC 1.1.1.34) that is associated with the same membranes. By cDNA encoding theArabidopsis HMG-CoA reductase, we isolated a corresponding gene from a cDNA library newly established from etiolated radish seedlings. This full-length cDNA, referred to as λcRS3, encodes a polypeptide of 583 amino acids with a molecular mass of about 63 kDa. The hydropathy profile suggests the presence of two hydrophobic membrane-spanning domains within the N-terminal 165 amino acids. The carboxy-terminal part, where the catalytic site resides, is highly conserved in all eukaryotic HMG-CoA reductase genes sequenced so far.
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Abbreviations
- AACT:
-
acetoacetyl-CoA thiolase
- ATP:
-
adenosine 5-triphosphate
- Brij W-1:
-
polyoxyethylene ether Brij W-1
- CoA:
-
coenzyme A
- DTE:
-
dithioerythritol
- EDTA:
-
ethylenediaminetetraacetate
- FPLC:
-
fast-performance liquid chromatography
- HMG-CoA:
-
3-hydroxy-3-methylglutaryl-coenzyme A
- HMGL:
-
HMG-CoA lyase
- HMGR:
-
HMG-CoA reductase
- HMGS:
-
HMG-CoA synthase
- HPLC:
-
high-performance liquid chromatography
- MVA:
-
mevalonic acid
- PAGE:
-
polyacrylamide gel electrophoresis
- SDS:
-
sodium dodecylsulfate
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Bach, T.J., Boronat, A., Caelles, C. et al. Aspects related to mevalonate biosynthesis in plants. Lipids 26, 637–648 (1991). https://doi.org/10.1007/BF02536429
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DOI: https://doi.org/10.1007/BF02536429