Herbicolins - new peptide antibiotics from Erwinia herbicola.

Abstract
E. herbicola (strain A 111) produces 2 acylated peptide antibiotics, herbicolins A and B. Isolation of herbicolins was performed by adsorption on a polystyrol adsorbent followed by elution with methanol. Further purification was achieved by gel filtration on Sephadex LH-20, counter-current distribution or by TLC. Herbicolin A was chemically characterized, containing 2 glycines, 1 L-threonine, 1 D-allo-threonine, 1 D-glutamic acid, 1 D-leucine, 1 L-arginine and .beta.-hydroxy myristic acid. Herbicolins A and B are inactive against bacteria, but highly active against yeasts and filamentous fungi.

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