Use of appropriate
selective culturing and isolation techniques has led to the
observation of significant antibiotic and cytotoxic activity
and has resulted in the isolation of a potent cytotoxin,
salinosporamide A (23; Scheme 6), a very potent proteasome
inhibitor (IC50 ) 1.3 nM),75 currently in phase I clinical trials
and heading for phase II. Other recent discoveries include
saliniketals A and B (24 and 25; Scheme 6), potential
chemopreventive agents isolated from Salinispora arenicola76
and the marinomycins, novel macrolides isolated from
another new actinomycete genus named Marinispora, with
marinomycins A (26; Scheme 6) to D showing potent activity
against drug-resistant bacterial pathogens and some melanomas
Use of appropriateselective culturing and isolation techniques has led to theobservation of significant antibiotic and cytotoxic activityand has resulted in the isolation of a potent cytotoxin,salinosporamide A (23; Scheme 6), a very potent proteasomeinhibitor (IC50 ) 1.3 nM),75 currently in phase I clinical trialsand heading for phase II. Other recent discoveries includesaliniketals A and B (24 and 25; Scheme 6), potentialchemopreventive agents isolated from Salinispora arenicola76and the marinomycins, novel macrolides isolated fromanother new actinomycete genus named Marinispora, withmarinomycins A (26; Scheme 6) to D showing potent activityagainst drug-resistant bacterial pathogens and some melanomas
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