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- W2087959478 abstract "We characterized the digestive proteinases of eight species of beetles to improve our understanding of the phylogenetic distribution of serine and cysteine proteinases. Serine proteinases function optimally under alkaline pH conditions, whereas cysteine proteinases require acidic pH. The phylogenetic distribution of cysteine proteinases suggests that they first appeared in an early cucujiform ancestor, however, data for some groups is patchy, and there has been speculation that they have been lost in at least one group, the long-horned beetles (Cerambycidae). The pattern we found supports the hypothesized origin of the proteinases and extends their distribution to an additional superfamily. In addition, we confirmed the presence of cysteine proteinases in some Curculionoidea. Cysteine proteinases were absent, however, from all three species of cerambycids surveyed, supporting the hypothesis that this group has reverted to the more ancestral serine (alkaline) digestive strategy. In four species we compared the pH optima for total proteolytic activity to the actual pH of the midgut and found the match between optimal and actual pH to be weaker in the cerambycids. These findings suggest that either a close correlation between midgut pH and the proteolytic pH optimum is not needed for adequate digestive efficiency, or that midgut pH is a more constrained digestive feature and there has been insufficient time for it to shift upwards to maximize serine proteinase activity." @default.
- W2087959478 created "2016-06-24" @default.
- W2087959478 creator A5014651191 @default.
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- W2087959478 date "2000-08-01" @default.
- W2087959478 modified "2023-10-03" @default.
- W2087959478 title "Phylogenetic distribution of cysteine proteinases in beetles: evidence for an evolutionary shift to an alkaline digestive strategy in Cerambycidae" @default.
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- W2087959478 doi "https://doi.org/10.1016/s0305-0491(00)00232-7" @default.
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