Corynebacterium kutscheri

Up to the present only two naturally-occurring N-hydroxypeptides have been isolated asparaginyl-L-a-N-hydroxyasparagine (46) (22) and aspartyl-L-a-N-hydroxyaspartyl-D-cycloserine (47) (23). The former was isolated from cultures of Mycobacterium avium, the latter (47) from Corynebacterium kutscheri. Both probably act as iron ionophores (siderophores) in these strains. It has also been reported (102) that in human brain tumor cell proteins one N-hydroxy amide bond occurs for every 300-500 amino acid residues. To date this has not been confirmed by other authors. 

Tripeptide Hydroxamate from Corynebacterium kutscheri. J. Bacteriol. 137, 243 (1979). 

---