A novel peptide antibiotic, K‐582, which exhibited significant growth inhibition of Candida, viruses and ascites tumor in mice, was found in the culture medium of a strain of Metarhizium anisopliae by Kondo et al. (J. Antibiotics33, 535–542 (1980)]. K‐582 consisted of two components, designated K‐582 A and K‐582 B. Threonine, tyrosine, ornithine, and an unusual amino acid were common in both peptides, but lysine was an extra component of K‐582 A. The unusual amino acid was identified to be threo‐γ‐hydroxy‐L‐arginine (OHArg) by means of mass, nuclear magnetic resonance and infrared spectrometries of the derivatives and the related compounds. The threonine and the arginine were assigned to be L‐configuration, and the ornithine and the tyrosine to be D‐configuration in both K‐582 A and K‐582 B, and the lysine to be L‐configuration by comparison of their optical rotatory dispersion spectra with those of standard amino acids. The elucidation of primary structure revealed that they were closely related heptapeptides with the following sequence: K‐582 A:H‐Arg‐OHArg‐Orn‐Thr‐Orn‐Lys‐Tyr‐OH; K‐582 B:H‐Arg‐OHArg‐Orn‐Thr‐Orn‐OHArg‐Tyr‐OH, and had the identical sequence in terms of the configuration of their constituents, namely L‐L‐D‐L‐D‐L‐D.

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