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In an effort to describe bioactive antifungal compounds from antagonistic bacteria with potential for biocontrol of plant pathogens, a strain of  Arthrobacter psychrophenolicus  was collected from plant disease suppressive compost prepared from composted material of marine origin. Few natural products have been characterized from the non-filamentous Actinobacteria genus  Arthrobacter . A new cyclic tetrapeptide, cyclo-(L-Pro-L-Leu-L-γHyp-L-Tyr); arthropeptide A ( 1 ), was isolated from the EtOAc soluble culture filtrate extract of  A. psychrophenolicus  M9-17 grown in MOLP broth. Its structure was confirmed by HRMS, interpretation of NMR data, and a modified Marfey’s method. Arthropeptide A ( 1 ) displayed antifungal activity towards  Alternaria alternata , the causal agent of disease in numerous host plant species, which had shown the previous susceptibility to  A. psychrophenolicus . The newly identified compound may be responsible, in part, for the inhibitory activity of the bacterium against fungal plant pathogens.

Arthropeptide A, an antifungal cyclic tetrapeptide from Arthrobacter psychrophenolicus isolated from disease suppressive compost