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R. Wiesendanger B. Martinoni T. Boller D. Arigoni 《Cellular and molecular life sciences : CMLS》1986,42(2):207-209
Summary Under the action of the appropriate synthase from ripe tomatoes a 11 mixture of (3S, 4R)-[3,4-2H2] and (3R, 4S)-[3,4-2H2]-(2S)-adenosylmethionine is transformed into a 11 mixture of the two meso forms of [2H2]-1-aminocyclopropanecarboxylic acid, a result which proves the operation of an inversion mechanism and which is consistent with direct nucleophilic displacement of the leaving group in the substrate. 相似文献
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Zur Stereochemie der Propandioldehydrase-Reaktion 总被引:2,自引:0,他引:2
Summary Propanedioldehydrase is shown to convert both (+)-(S)-2-2H-propanediol,3, and (–)-(R)-1-2H2-propanediol,5, to specimens of deuterated propion-aldehyde, for which the (S)-configuration has been established. Thus, in the propanedioldehydrase reaction migration of hydrogen atoms from C–1 to C–2 always occurs with inversion of configuration. 相似文献
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Ohne Zusammenfassung 相似文献
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Zum Mechanismus der Propandioldehydrase-Reaktion 总被引:2,自引:0,他引:2
J. Rétey A. Umani-Ronchi J. Seibl D. Arigoni 《Cellular and molecular life sciences : CMLS》1966,22(8):502-503
Summary Investigation of the propanediol dehydrase reaction with18O-labelled substrates indicates that the conversion of propane-1,2-diol to propionaldehyde involves transfer of the oxygen atom from C-2 to C-1. The dehydration of the so formed propane-1,1-diol is sterically controlled by the enzyme. 相似文献
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T. J. Wolpert V. Macko W. Acklin B. Jaun J. Seibl J. Meili D. Arigoni 《Cellular and molecular life sciences : CMLS》1985,41(12):1524-1529
Summary The predominant host-selective toxin fromCochliobolus victoriae, victorin C, is a peptide with an apparent mol. wt of 796, representing a cyclic array of the subunits1–6. The structure of the toxin has now been established as in16 through analysis of the degradation products generated by enzymic and non-enzymic partial hydrolysis. The presence of a hydrated aldehydo group requires for victorin C the composition C31H45O13N6Cl3 with an amended mol. wt of 814, for which independent experimental support has been secured. 相似文献
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Summary The biosynthesis of reserpinine (II) and vincamedine (IVa) in Vinca plants has been investigated with the help of labelled precursors. Incorporation of 1-14C-Sodium acetate into the non-tryptophan C10-moiety of these alkaloids occurred only with extensive randomization of the label. In addition, indications were obtained that the methyl group of methionin is not involved in the formation of this fragment. 相似文献
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J. Rétey F. Kunz T. C. Stadtman D. Arigoni 《Cellular and molecular life sciences : CMLS》1969,25(8):801-802
Summary Using tritium labelled substrates it is shown that in the rearrangement of (S) --lysine to 3,5-diaminohexanoic acid catalysed by-lysine mutase a stereospecific hydrogen migration from C-5 to C-6 of the substrate occurs. When the reaction is carried out in the presence of [5-3H]-coenzyme B12, the heavy isotope is transferred both to C-6 of 3, 5-diaminohexanoate and to C-5 of-lysine. In the latter the labelled atom occupies the same diastereotopic position as the H atom that is transferred to C-6 of the product. 相似文献