Influence of growth medium in proteinase and pigment production by Streptomyces cyaneus.
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Culture Media↗
Biomedical subjects
A B Vermelho
Publications and source records attributed to A B Vermelho.
Extracellular serine-proteinases isolated from Streptomyces alboniger: partial characterization and effect of aprotinin on cellular structure.
Streptomyces alboniger ATCC 12461 grown in brain heart infusion (BHI) medium produced two extracellular serine-proteinases, denoted SP I and SP II, which were purified by ammonium sulfate precipitation and aprotinin-agarose affinity chromatography. SP I was purified 88,9-fold and SP II 66,7- fold, with 33.4% and 10.4% yield, respectively. The optimum pH for the proteinases activity, using a-N-p-tosyl-L-arginine-methyl ester (TAME) as substrate, was 9-10 and the optimum temperature was 37 degrees C. The proteolytic activity of SP I and SP II was inhibited by aprotinin and SP I was partially inhibited by leupeptin, both serine-proteinase inhibitors. S. alboniger growth in BHI-liquid medium decreased when 5 mg/ml, 10 mg/ml of aprotinin was used, being completely inhibited with 20 mg/ml and 40 mg/ml. At the ultrastructural level, aprotinin-treated S. alboniger cells showed swelling of the bacterial body and condensation of the genetic material, probably related to the inhibition of its growth.
Aprotinin↗
Monohexosylceramides of Trypanosoma dionisii.
A detailed knowledge of the primary structure of neutral glycosphingolipids isolated and purified from Trypanosoma dionisii has been elucidated using a combination of techniques--as column chromatography, HPTLC and GC-MS together with fast atom bombardment spectrometry. The ceramide monohexoside fraction (CMH) contained both glucosyl- and galactosylceramides in a ratio of 1:1, sphingosine and as fatty acyl groups mainly C-24 saturated and 2-hydroxy fatty acids. A close similarity between Trypanosoma cruzi and T. dionisii monohexosylceramides was reported.
Animals↗