Inhibitory effects of aminoglycoside antibiotics on reduction of cytochrome c from Candida krusei.

Abstract:

:Five aminoglycoside antibiotics (AGAs)--kanamycin (KM), bekamycin (AKM), dibekacin (DKB), ribostamycin (RSM) and paromomycin (PRM)--were studied for their effects on the nonenzymic reduction of cytochrome c by FeSO4 (Yamabe's system). Their inhibitory activity was in the order: DKB greater than AKM greater than KM greater than RSM greater than PRM. As this order correlated closely with that of the antibacterial activity of AGAs, Yamabe's system has proved useful in predicting the latter activity. Divalent metal ions other than Fe2+ enhanced the AGA-dependent inhibition of Yamabe's system in the order: Cu2+ greater than Mn2+ greater than Zn2+ greater than Co2+ greater than Ni2+ greater than. This order was similar to that of stability constants with general chelators except for the low positions of Ni2+ and Co2+. These findings suggested a metal chelation with free or bound Fe2+ for the action mechanism of AGAs on Yamabe's system and the bacterial growing system. The antagonistic effects of exogenous Fe2+ on the antibacterial activity against Staphylococcus aureus and Escherichia coli as measured by the agar dilution method supported this concept. A dual relationship of molecular structure with chelating and antibacterial activities demonstrated the importance of high molecular basicity in a potent AGA. However, the combination effect of pipemidic acid (stimulator on Yamabe's system) with KM was different from that with 1,10-phenanthroline (inhibitor on Yamabe's system) as measured by Dye's method using Pseudomonas aeruginosa.

journal_name

Chemotherapy

journal_title

Chemotherapy

authors

Yamabe S

doi

10.1159/000237880

subject

Has Abstract

pub_date

1980-01-01 00:00:00

pages

28-35

issue

1

eissn

0009-3157

issn

1421-9794

journal_volume

26

pub_type

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