Synthesis and peptide bond orientation in tetrapeptides containingL-azetidine-2-carboxylic acid andL-proline

Misincorporation of the proline homologue Aze (azetidine-2-carboxylic acid) into recombinant myelin basic protein.

We have evaluated the effects of the proline homologue Aze (1) (azetidine-2-carboxylic acid) on growth of Escherichia coli strains used to over-express recombinant forms of murine myelin basic protein (rmMBP), and on the degree of misincorporation. Addition of Aze to minimal media resulted in severe diminution of growth rate, but rmMBP could still be produced and purified. Mass spectrometry ind...

Effect of a proline analogue, azetidine-2-carboxylic acid, on the morphogenesis in vitro of mouse embryonic lung.

A proline analogue, azetidine-2-carboxylic acid, which has been reported to selectively depress collagen biosynthesis, affects lung morphogenesis in vitro by determining differential modifications of the rate of epithelial growth and ramification activity. Low concentrations of the analogue induce a sharp decline of the number of newly formed terminal buds, leaving the rate of global growth of ...

Azetidine-2-carboxylic acid: a new cyclic imino acid occurring in plants.

SYNTHESIS OF 3-ARYLMETHYL-4- THIAZOLIDINE-CARBOXYLIC ACID-2-ONES AND 2-THIONES

Barium salts of dibenzylidene cystines 8a-c were obtained from the reaction of Lcystine with benzaldehyde or its derivatives in the presence of barium hydroxide. Their reduction with zinc and hydrochloric acid in methanol yielded the Narylmethylcysteines ?9a-c?. These can, in turn, be converted by esterification into the methyl esters ?10 a-c. ?Reaction of N, N'-carbonyl diimidazole (Im C...

Incorporation of L-azetidine-2-carboxylic acid into hemoglobin in rabbit reticulocytes in vitro.

L-Azetidine-2-carboxylic acid is the naturally occurring lower homologue of L-proline. Reticulocytes from anemic rabbits incubated with DL-[14-C]azetidine-2-carboxylic acid synthesized radiolabeled hemoglobin, which when isolated from cell lysates co-chromatographed with unlabeled hemoglobin on Sephadex G-100 columns. Amino acid analysis of hemoglobin from reticulocytes incubated with DL-[14-C]...