Abstract
Aminoethylcysteine, lanthionine, cystathionine and cystine are mono-deaminated either by L-amino-acid oxidase or by a transaminase exhibiting the properties described for glutamine transaminase. The deaminated products cyclize producing the respective ketimines. Authentic samples of each ketimine were prepared by reacting the appropriate aminothiol compound with bromopyruvate, except cystine ketimine which required the interaction of thiopyruvate with cystine sulfoxide. Reduction of the first three mentioned ketimines with NaBH4 yields the respective derivatives with the saturated rings of thiomorpholine and hexahydrothiazepine. The same reduction is carried out enzymically by a reductase extracted from mammalian tissues. Properties of the members of this family of compounds are described. Gas chromatography followed by mass spectrometry permits the identification of most of these products. HPLC is very useful for the determination of the ketimines by taking advantage of specific absorbance at 380 nm obtained by prior derivatization with phenylisothiocyanate. Adaptation of these and other analytical procedures to biological samples disclosed the presence of most of these compounds in bovine brain and in human urine. By using [35S]lanthionine ketimine as a representative member of the ketimine group, the specific, high-affinity, saturable and reversible binding to bovine brain membranes has been demonstrated. The binding is removed by aminoethylcysteine ketimine and by cystathionine ketimine indicating the occurrence in bovine brain of a common binding site for ketimines. The reduced ketimines are totally ineffective in competing with [35S]lanthionine ketimine. Altogether these findings are highly indicative for the existence in mammals of a novel class of endogenous sulfur-containing cyclic products provided with a possible neurochemical function to be investigated further.
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Abbreviations
- AEC:
-
S-(2-aminoethyl)-L-cysteine
- AECK:
-
S-(2-aminoethyl)-L-cysteine ketimine
- LK:
-
lanthionine ketimine
- CK:
-
cystathionine ketimine
- CysK:
-
cystine ketimine
- TMA:
-
1,4-thio-morpholine-3-carboxylic acid
- TMDA:
-
l,4-thiomorpholine-3,5-dicarboxylic acid
- cyclothionine:
-
l,4-hexahydrothiazepine-3,5-dicarboxylic acid
- CNS:
-
central nervous system
- GC:
-
gas chromatography
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Cavallini, D. et al. (1991). Sulfur-containing cyclic ketimines and imino acids. In: Christen, P., Hofmann, E. (eds) EJB Reviews 1991. EJB Reviews 1991, vol 1991. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-77200-9_19
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DOI: https://doi.org/10.1007/978-3-642-77200-9_19
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