Beschreibung:
<jats:p><jats:bold>Antibiotics From Gliding Bacteria, LV. – Myxochromide A: A Highly Unsaturated Lipopetide from <jats:italic>Myxococcus virescens</jats:italic></jats:bold></jats:p><jats:p>The isolation and structure elucidation of a new family of pigments, the myxochromides, are described. Myxochromide A was determined as a hexapeptide lactone out of: <jats:sc>L</jats:sc>‐Methyl‐Thr, <jats:sc>D</jats:sc>‐ or <jats:sc>L</jats:sc>‐Ala, <jats:sc>L</jats:sc>‐Leu, <jats:sc>L</jats:sc>‐Pro, <jats:sc>D</jats:sc>‐ or <jats:sc>L</jats:sc>‐Ala and <jats:sc>L</jats:sc>‐Glu, respectively. Its lactone formation was observed between the γ‐carboxyl of Glu and the OH group of the Me‐Thr residue. The chromophore, a heptaenoic acid, was found to bind as an amide to the N‐atom of the Thr moiety. <jats:italic>Myxococcus flavescens</jats:italic> produces the same pigments with myxochromide B as the main compounds.</jats:p>