INSENSITIVITY OF SEPTORIA-TRITICI AND USTILAGO-MAYDIS TO INHIBITORS OF ORNITHINE DECARBOXYLASE

被引:11
作者
SMITH, TA [1 ]
BARKER, JHA [1 ]
OWEN, WJ [1 ]
机构
[1] DOWELANCO LTD, WANTAGE OX12 9JT, OXON, ENGLAND
来源
MYCOLOGICAL RESEARCH | 1992年 / 96卷
关键词
D O I
10.1016/S0953-7562(09)80959-3
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Growth of Septoria tritici and Ustilago maydis is relatively insensitive to 1 mm difluoromethylornithine (DFMO), and other potent enzyme-activated inhibitors of ornithine decarboxylase (ODC). For the ODC from S. tritici, the K(i)s for DFMO, dehydromonofluoromethylornithine (DELTA-FMO) and methylacetylenicputrescine (MAP) are 22, 5, and 35-mu-M respectively, and the ODC from U. maydis appears to be similarly sensitive. On growing in 1 mm-DFMO, the polyamine content, which consisted mainly of spermidine in both fungi, is reduced to 30-40%. DFMO appears to penetrate freely into both fungi. The maximum ornithine concentration is about 12 mm in S. tritici and about 0.6 mM in U. maydis when grown in DFMO. In S. tritici neither arginine, citrulline nor acetylornithine appeared to serve as precursors for putrescine, and growth was not inhibited by 1 mm difluoromethylarginine (DFMA), or -citrulline (DFMC). In U maydis no evidence was found for the decarboxylation of arginine or citrulline.
引用
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页码:395 / 400
页数:6
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