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PubMed1978

Globomycin, a new peptide antibiotic with spheroplast-forming activity. III. Structural determination of globomycin.

The structure of globomycin has been determined by mass, PMR and CMR spectra and by chemical degradation. Globomycin is a new cyclic peptide antibiotic composed of L-serine, L-allo-threonine, glycine, N-methylleucine, L-allo-isoleucine and 3-hydroxy-2-methylnonaic acid. Among these components, L-allo-threonine, L-allo-isoleucine and 3-hydroxy-2-methylnonaic acid are novel components from natural products. A newly developed mass analysis has been introduced for determining the diastereoisomers of allo-threonine.

Amino Acids↗
PubMed1988

Lectin mediated agglutination of Candida kefyr cells and their spheroplasts grown in sterol enriched growth medium and its correlation with lipid composition.

Supplementation of the growth medium with erosterol, cholesterol and lanosterol enriched the Candida kefyr cells, presumably cell membranes with sterols. Sterol enriched C. kefyr cells showed a decrease in percentage of PHA and Con-A mediated agglutination. Sterol supplementation also increased the sterol: phospholipid ratio and in such cells unsaturated fatty acids predominated over saturated ones. The overall effect of these changes resulted in rigidifying the cell membranes as indicated by shift of break in Arrhenius plots of Mg2+ ATPase. This showed that lectin mediated agglutination of yeast cells may be affected by its membrane fluidity.

Agglutination↗