Streptomycin, the antibiotic produced by Streptomyces griseus, contains as a part of its structure a diguanidine derivative of scyllo-inositol called streptidine. Two major precursors of the streptidine portion of the molecule have now been defined, n-arginine and n-glucose (1, 2). Arginine plays a role in the formation of the guanidine side chains, whereas glucose is involved in the synthesis ...

In view of the marked activity of streptomycin in vitro against a number of species of organisms relatively resistant to penicillin, such as Escherichia coli (Schatz, Bugie, and Waksman, 1944), certain of the Salmonella (Robinson, Smith, and Graessle, 1944), Klebsiella pneumoniae (Donovick, Hamre, Kavanagh, and Rake, 1945), and Mycobacterium tuberculosis (Schatz and Waksman, 1944), as well as i...

AdpA is the key transcriptional activator for a number of genes of various functions in the A-factor regulatory cascade in Streptomyces griseus, forming an AdpA regulon. Trypsin-like activity was detected at a late stage of growth in the wild-type strain but not in an A-factor-deficient mutant. Consistent with these observations, two trypsin genes, sprT and sprU, in S. griseus were found to be ...

Streptomyces strain K1-02, which was identified as a strain of Streptomyces albidoflavus, secreted at least six extracellular proteases when it was cultured on feather meal-based medium. The major keratinolytic serine proteinase was purified to homogeneity by a two-step procedure. This enzyme had a molecular weight of 18,000 and was optimally active at pH values ranging from 6 to 9.5 and at tem...

objective(s):drug delivery through the skin can transfer therapeutic levels of drugs for pharmacological effects. analgesics such as nsaids have gastrointestinal side effects and topical dosage forms of these drugs are mainly preferred, especially for local pains. meloxicam is one of nsaids with no topical form in the market. in this research, we attempted to quantify the skin permeation of a m...

Two Streptomyces griseus strains were isolated from different soil types. S. griseus CAG17 strain was isolated from an agricultural area with low organic matter but rich in phosphorus content and S. griseus 26K strain was isolated from a forest area rich in organic matter with a low phosphorus content. The survival and metabolic activity of these isolates were studied in dynamic sterile soil mi...

phores with ruminant growth promoting properties, we have previously reportcd the structure of antibiotic M1396032), the行rst tetronic acidcontainillg polyether. We now wish to describe antibiotic M144255, a monocarboxylic acid type ionophore from a strain of Streptomyces griseus. It has a high affinity fbr divalent cations especially zinc, for which reason it was given the trivial name, zincoph...

A filamentous soil bacterium, Streptomyces griseus 2247, carries a 7. 8-Mb linear chromosome. We previously showed by macrorestriction analysis that mutagenic treatments easily caused deletions at both ends of its linear chromosome and changed the chromosome to a circular form. In this study, we confirmed chromosomal circularization by cloning and sequencing the junction fragments from two dele...