streptomyces tsukubensis streptomyces tsukubensis streptomyces tsukubensis is a bacterium species from the genus of streptomyces which has been isolated from soil in ibaraki in japan. streptomyces tsukubensis produces the immunosuppressant tacrolimus. streptomyces tritolerans scientific classification domain: bacteria phylum: actinomycetota class: actinomycetia order: streptomycetales family: streptomycetaceae genus: streptomyces species: s. tritolerans binomial name streptomyces tritoleransmuramatsu and nagai 2013 type strain 9993, dsm 42081, nbrc 108819, nbrc 108919 synonyms "streptomyces tsukubaensis" tanaka et al. 1987