HEAT-SHOCK PROTEIN-SYNTHESIS AND THERMOTOLERANCE IN CATAGLYPHIS, AN ANT FROM THE SAHARA DESERT
HEAT-SHOCK PROTEIN-SYNTHESIS AND THERMOTOLERANCE IN CATAGLYPHIS, AN ANT FROM THE SAHARA DESERT
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DOI：
10.1073/pnas.92.7.2994
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发表时间：
1995-03-28
影响因子：
11.1
通讯作者：
WEHNER, R
中科院分区：
文献类型：
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作者：
GEHRING, WJ;WEHNER, R
蚂蚁Cataglyphis生活在撒哈拉沙漠，是已知的耐热性最强的陆地动物之一。它在50摄氏度以上的体温下觅食，家蚕的临界热极值为53.6+/-0.8摄氏度，双色斑潜蝇的临界热极值为55.1+/-1.1摄氏度。分析了Cataglyphis中热休克蛋白(HSPs)的合成和积累，并与生活在较温和气候的蚂蚁Formica和两种果蝇进行了比较。在Cataglyphis中，蛋白质的合成在高达45摄氏度的温度下继续进行，而在Formica和果蝇中，蛋白质合成的温度为39摄氏度。TNO果蝇种，黑腹果蝇和疑似果蝇，它们诱导HSP合成和积累的最大温度不同，分别为3-4℃。相反，这两种蚂蚁在受热之前积累HSP，在Cataglyphis中，从头合成蛋白质诱导HSP的最大温度仅比Formica高2℃。这些发现被解释为蚂蚁在暴露于高温之前的预适应。
The ant Cataglyphis lives in the Sahara desert and is one of the most thermotolerant land animals known. It forages at body temperatures above 50 degrees C, and the critical thermal maxima are at 53.6 +/- 0.8 degrees C for Cataglyphis bombycina and 55.1 +/- 1.1 degrees C for Cataglyphis bicolor. The synthesis and accumulation of heat shock proteins (HSPs) were analyzed in Cataglyphis and compared to Formica, an ant living in more moderate climates, and to two Drosophila species. In Cataglyphis, protein synthesis continues at temperatures up to 45 degrees C as compared to 39 degrees C for Formica and Drosophila. The tno Drosophila species, Drosophila melanogaster and Drosophila ambigua, differ with respect to their maximal induction of HSP synthesis and accumulation by 3-4 degrees C. In contrast, the two ant species accumulate HSPs prior to their exposure to heat, and in Cataglyphis the temperature of maximal HSP induction by de novo protein synthesis is only 2 degrees C higher than in Formica. These findings are interpreted as preadaption of the ants prior to exposure to high temperatures.