ATP phosphoribosyltransferase from symbiont Entomomyces delphacidicola invovled in histidine biosynthesis of Nilaparvata lugens (Stål)
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Histidine is an essential amino acid assumed to be synthesized by an obligatory yeast-like symbiont (Entomomyces delphacidicola str. NLU) in Nilaparvata lugens, an important rice pest. The adenosine-triphosphate phosphoribosyltransferase (ATP-PRTase) facilities the committed first step of the histidine biosynthesis pathway. In the current study, a putative ATP-PRTase was cloned and verified to be of E. delphacidicola origin (EdePRTase). The expression of the gene was spatial and temporal universal with a profile that matched the distribution of the fungal symbiont. RNA interference aided the knockdown of the EdePRTase-suppressed EdePRTase expression by 32–48 %. Hemolymph histidine level was also reduced followed by significant reduction of adult body weight. However, other performance characters including nymph development, survival, and adult sex ratio were not adversely affected by the knockdown. Furthermore, forced histidine exposure (through injection or feeding) significantly inhibited the EdePRTase mRNA levels at higher concentrations, but significantly increased EdePRTase expression levels at lower concentrations (feeding only). The significance of these findings support that the EdePRTase is from symbiont E. delphacidicola, and its involvement in histidine biosynthesis of N. lugens was discussed. The results provide a better understanding of EdePRTase and the encoded functional ATP-PRTase enzyme regulation in N. lugens and insects in general.
KeywordsATP Phosphoribosyltransferase Histidine biosynthesis Entomomyces delphacidicola Nilaparvata lugens
This research was supported by Grants of the National Natural Science Foundation of China (31371939), the National Rice Industrial Technology System (CARS-1-18) and the Agricultural Science and Technology Innovation Program (ASTIP) of Chinese Academy of Agricultural Sciences.
Compliance with ethical standards
Research involving human participants and/or animals
All animal work was conducted according to relevant national and international guidelines.
Conflict of interest
The authors have declared that no competing interests exist.
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