- Volume 34 Issue 3
Antifungal activities of peptides with the sequence 10-17 of magainin 2 at the N-termini against aspergillus fumigatus
Antifungal Activities of Peptides with the Sequence 10-17 of Magainin 2 at the N-termini against Aspergillus fumigatus
- Lee, Myung Kyu (KIST) ;
- Lee, Dong Gun (KIST) ;
- Shin Song Yub (KIST) ;
- Lee, Sung Gu (KIST) ;
- Kang Joo Hyun (KIST) ;
- Hahm, Kyung Soo (KIST)
- Published : 1996.09.01
Two peptides, MA-inv AND MA-ME, with the sequence 10-17 of maganin 2 at their-N-termini were designed and synthesized. The peptides had higher antifungal activities against Aspergilus fumigatus without hemolytic activities. The minimal inhibition concentratory (MIC) values of both peptides against A. fumigatus were 5 .mu.g/ml, whereas those of the native peptides, magainin 2 and melittin, were 10.mu.g/ml. At 3 .mu.g/ml, MA-inv and MA-ME inhibited the mycelium growth of A. fumigatus by 94.6% and 97.3% respectively, whereas magainin 2 and melittin inhibited by 62.2% and 32.4, respectively. MA-inv showed up to 80% inhibition of (1, 3)-.betha.-D-glucan synthase activity of A. fumigatus. The peptides also showed up to 80% inhibition of (1, 3)-.betha.-D glucan synthase activity of A. fumigatus. The peptides also showed antifungal activities for other fungi of Aspergillus sp. However, the antibiotic activities of MA-ME against Escherichia coli, Bacillus subtilis and Fusarium oxysporum were more effective than those of MA-inv, suggesting that the C-terminal sequences of MA-inv and MA-ME may also influence their antibiotic activities. These results suggest that the N-terminal sequence of the designed peptides, KKFGKAFV, is important for their antifungal activities against A. fumigatus and their C- terminal sequences are related to the organism selectivity.
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