Clone and functional analysis of Seryl-tRNA synthetase and Tyrosyl-tRNA synthetase from silkworm, Bombyx mori.

Abstract:

:Aminoacyl-tRNA synthetases are the key enzymes for protein synthesis. Glycine, alanine, serine and tyrosine are the major amino acids composing fibroin of silkworm. Among them, the genes of alanyl-tRNA synthetase (AlaRS) and glycyl-tRNA synthetase (GlyRS) have been cloned. In this study, the seryl-tRNA synthetase (SerRS) and tyrosyl-tRNA synthetase (TyrRS) genes from silkworm were cloned. Their full length are 1709 bp and 1868 bp and contain open reading frame (ORF) of 1485 bp and 1575 bp, respectively. RT-PCR examination showed that the transcription levels of SerRS, TyrRS, AlaRS and GlyRS are significantly higher in silk gland than in other tissues. In addition, their transcription levels are much higher in middle and posterior silk gland than in anterior silk gland. Moreover, treatment of silkworms with phoxim, an inhibitor of silk protein synthesis, but not TiO2 NP, an enhancer of silk protein synthesis, significantly reduced the transcription levels of aaRS and content of free amino acids in posterior silk gland, therefore affecting silk protein synthesis, which may be the mechanism of phoxim-silking disorders. Furthermore, low concentration of TiO2 NPs showed no effect on the transcription of aaRS and content of free amino acids, suggesting that TiO2 NPs promotes silk protein synthesis possibly by increasing the activity of fibroin synthase in silkworm.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Hu J,Tian J,Li F,Xue B,Hu J,Cheng X,Li J,Shen W,Li B

doi

10.1038/srep41563

subject

Has Abstract

pub_date

2017-01-30 00:00:00

pages

41563

issn

2045-2322

pii

srep41563

journal_volume

7

pub_type

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