摘要:
New antibiotically active compounds having the basic structure of rifamycin S, namely 3-hydroxyrifamycin S (formula A: X=>C.dbd.O; R.sup.1 =OH; R.sup.2 =H), 3,31-dihydroxy-rifamycin S (formula A: X=>C.dbd.O; R.sup.1 =R.sup.2 =OH) and 1-desoxy-1-oxarifamycin S (formula A: X=--O--; R.sup.1 =R.sup.2 =H) ##STR1## are formed by cultivating, under aerobic conditions, a strain of Nocardia mediterranei which is derived from Streptomyces mediterranei ATCC 13 685 as the parent strain and is characterized by the ability to produce at least one of the mentioned compounds. The recombinant strain Nocardia mediterranei DSM 1415 has proved suitable. The mentioned rifamycin S analogues have analogous antibiotic properties to this but have a wider range of action, especially against gram-negative bacteria.
摘要翻译:具有利福霉素S的基本结构的新的抗生素活性化合物即3-羟基喜树碱S(式A:X => C = O; R1 = OH; R2 = H),3,31-二羟基利福霉素S(式A:X (A = X = -O-; R 1 = R 2 = H)通过在有氧下培养形成(A),(C = O; R1 = R2 = OH)和1-脱氧-1-氧硫霉素S 条件,来自地衣链霉菌(Streptomyces mediterranei)ATCC13685作为亲本菌株的诺卡氏菌(Nocardia mediterranei)菌株,其特征在于产生至少一种所述化合物的能力。 重组菌诺卡氏菌DSM 1415已证明是合适的。 所提到的利福霉素S类似物具有类似的抗生素特性,但具有更广泛的作用范围,特别是针对革兰氏阴性细菌。
摘要:
In compounds of formula ##SPC1##Wherein R represents a lower alkyl radical and R.sub.1 the acyl radical of a carboxylic acid the acylamino group is deacylated to the amino group when the compounds are treated with microorganisms possessing acylase activity or with extracts containing acylase or with the acylases themselves in aqueous medium. The isolation of the amino compounds so formed is carried out in known manner.
摘要:
The invention relates to cobalamin derivatives (a) having no binding affinity or low binding affinity to the transport protein transcobalamin II TCII) and (b) retaining activity as a vitamin B12 substitute, optionally carrying a therapeutic and/or diagnostic agent, such as a radioactive metal. These compounds have a much reduced accumulation rate in blood and benign organs, such as kidney and liver, compared to the accumulation rate in neoplastic tissues, and are more rapidly eliminated from blood. The invention further relates to a method of diagnosis and a method of treatment of a neoplastic disease or an infection by microorganisms in a mammal comprising (a) exposing the mammal to a period of a vitamin B12-free diet, and (b) subsequently applying a cobalamin derivative of the invention carrying a diagnostic and/or therapeutic agent. By selecting cobalamin derivatives acting as vitamin B12 substitutes, the risk of the formation of resistant offspring in neoplastic tissue is much reduced.
摘要:
New antibiotically active compounds having the basic structure of rifamycin S, namely 3-hydroxyrifamycin S (formula A: X.dbd.>C.dbd.O; R.sup.1 .dbd.OH; R.sup.2 .dbd.H), 3,31-dihydroxyrifamycin S (formula A: X.dbd.>C.dbd.O; R.sup.1 .dbd.R.sup.2 .dbd.OH) and 1-desoxy-1-oxarifamycin S (formula A: X.dbd.--O--; R.sup.1 .dbd.R.sup.2 .dbd.H) ##STR1## are formed by cultivating, under aerobic conditions, a strain of Nocardia mediterranei which is derived from Streptomyces mediterranei ATCC 13 685 as the parent strain and is characterized by the ability to produce at least one of the mentioned compounds. The recombinant strain Nocardia mediterranei DSM 1415 has proved suitable. The mentioned rifamycin S analogues have analogous antibiotic properties to this but have a wider range of action, especially against gram-negative bacteria.
摘要翻译:具有利福霉素S的基本结构的新型抗生素活性化合物,即3-羟基喜树碱S(式A:X => C = O; R 1 = OH; R 2 = H),3,31-二羟基化合物S(式A:X = C = O; R1 = R2 = OH)和1-脱氧-1-氧硫霉素S(式A:X = -O-; R1 = R2 = H)通过在需氧条件下培养, 作为亲本菌株来源于地塞米松(Streptomyces mediterranei)ATCC13685的诺卡氏菌(Nocardia mediterranei)菌株,其特征在于产生至少一种所述化合物的能力。 重组菌诺卡氏菌DSM 1415已证明是合适的。 所提到的利福霉素S类似物具有类似的抗生素特性,但具有更广泛的作用范围,特别是针对革兰氏阴性细菌。
摘要:
The new antibiotic "Papulacandin" is obtained by the cultivation of the microorganism Papularia sphaerosperma (Pers.) Hohnel, especially of the strain NRRL 8086, under aerobic conditions in an aqueous nutrient medium. There can also be used mutants of said microorganisms. Papulacandin consists of various components A, B, C, D and E, the more important of which are A and B, whose structures have been elucidated to a great extent: they contain only carbon, hydrogen and oxygen. Papulacandin and its components have a strong anti-fungal action, for instance against Candida albicans, and can be used for combating infections caused by pathogenic fungi.