Cyclopeptide antibiotic that inhibits both Gram-positive and Gram-negative bacteria (PubMed:29177092). Shows potent to weak activities against M.flavus (MIC=3 ug/ml), B.cereus (MIC=12 ug/ml), B.pumilus (MIC=12 ug/ml), E.coli (MIC=12 ug/ml), and S.pneumoniae (MIC=47 ug/ml) (PubMed:29177092). May act by forming pores (Probable). The cross-link permits a high resistance to proteolysis. Is more resistant to specific proteases than to unspecific proteases. Monoisotopic mass. Strain B4107 was originally classified as being from Bacillus pumilus, hence protein name pumilarin.