Double Stage Activity in Aminoglycoside Antibiotics.
作者:KUNIMOTO HOTTA、ATSUKO SUNADA、YOKO IKEDA、SHINICHI KONDO
DOI:10.7164/antibiotics.53.1168
日期:——
Fourteen different aminoglycoside antibiotics (AGs) were challenged with aminoglycoside acetyltransferases (AACs) of actinomycete origin in order to examine their 'double stage activity' that is arbitrarily defined as antibiotic activity retainable after enzymatic modification. In kanamycin (KM)-group AGs tested [KM, dibekacin (DKB), amikacin and arbekacin (ABK)], ABK retained activity after acetylations by AAC(3), AAC(2') and AAC(6'). DKB also retained a weak activity after acetylation by AAC(2'). In gentamicin (GM)-group AGs tested [GM, micronomicin, sisomicin (SISO), netilmicin (NTL) and isepamicin], GM, SISO and NTL retained activites after acetylation by AAC(2'). In neomycin (NM)-group AGs tested [ribostamycin, NM, paromomycin], NM retained activity after acetylation by AAC(6') and AAC(2'). None of astromicin (ASTM)-group AGs tested (ASTM and istamycm B) retained activity after acetylation by AAC(2') and AAC(6'). The activities of acetylated ABK derivatives by AAC(3) and AAC(2') were distinctively high> compared to the others. Streptomyces lividans TK21 containing the cloned aac genes were markedly sensitive to AGs that retained activities after acetylation, indicating the substantial effect of 'double stage activity'.
对十四种不同的氨基糖苷类抗生素(AGs)进行实验,挑战来源于放线菌的氨基糖苷乙酰转移酶(AACs),以检验其“二重活性”,该活性被任意定义为在酶修饰后仍能保留的抗生素活性。在测试的庆大霉素(KM)类AGs中 [KM、双贝卡霉素(DKB)、阿米卡星和阿尔贝卡星(ABK)],阿尔贝卡星在AAC(3)、AAC(2') 和 AAC(6') 乙酰化后仍保留活性。双贝卡霉素在AAC(2') 乙酰化后也保留了微弱的活性。在测试的庆大霉素(GM)类AGs中 [GM、微诺霉素、硫杉霉素(SISO)、耐替米星(NTL)和异帕霉素],庆大霉素、硫杉霉素和耐替米星在AAC(2') 乙酰化后保留了活性。在测试的新霉素(NM)类AGs中 [利博霉素、新霉素、帕罗霉素],新霉素在AAC(6') 和 AAC(2') 乙酰化后保留了活性。测试的阿斯霉素(ASTM)类AGs(ASTM和依斯塔霉素B)在AAC(2') 和 AAC(6') 乙酰化后均未保留活性。经过AAC(3) 和 AAC(2') 乙酰化的阿尔贝卡星衍生物的活性明显高于其他。含有克隆aac基因的放线菌利维丹斯TK21对在乙酰化后仍能保留活性的AGs表现出显著敏感,表明“二重活性”具有显著效果。