We transform the singular integral equations with solutions simultaneously having singularities of higher order at infinite point and at several finite points on the real axis into ones along a closed contour with sol...We transform the singular integral equations with solutions simultaneously having singularities of higher order at infinite point and at several finite points on the real axis into ones along a closed contour with solutions having singularities of higher order, and for the former obtain the extended Neother theorem of complete equation as well as the solutions and the solvable conditions of characteristic equation from the latter. The conclusions drawn by this article contain special cases discussed before.展开更多
Besides transcription regulation, gene expression is also regulated at translation level. Although translation regulation is mainly mediated by translation initiation, an abundance of evi-dence shows that the terminat...Besides transcription regulation, gene expression is also regulated at translation level. Although translation regulation is mainly mediated by translation initiation, an abundance of evi-dence shows that the termination phase of translation is also important for gene expression. The expression of lN gene is down regulated at translation level in L24 mutant, however the precise mechanism still remains unknown. We report here that in an L24 mutant strain, the expression of lac-lN and GST-lN is decreased to 25% and 50% of that in wild type T83 strain respectively. Strikingly, the yield of GST-lN fusion protein in L24 mutant can be restored to the level as in T83 wild type strain by changing the two codons upstream lN stop codon. These findings imply that the stop codon and its context are involved in the translation regulation. The possible reason is that the translation termination complex containing L24 mutant ribosome may not dissociate prop-erly in stop code region. This failure of disengagement from mRNA will slow down the process of following ribosomes, and consequently decrease the efficiency of lN gene expression.展开更多
基金Supported by the NNSF of China (10471107)RFDP of Higher Education of China (20060486001)
文摘We transform the singular integral equations with solutions simultaneously having singularities of higher order at infinite point and at several finite points on the real axis into ones along a closed contour with solutions having singularities of higher order, and for the former obtain the extended Neother theorem of complete equation as well as the solutions and the solvable conditions of characteristic equation from the latter. The conclusions drawn by this article contain special cases discussed before.
基金This work was supported by the National Natural Science Foundation of China (Grant No. 39870407). References
文摘Besides transcription regulation, gene expression is also regulated at translation level. Although translation regulation is mainly mediated by translation initiation, an abundance of evi-dence shows that the termination phase of translation is also important for gene expression. The expression of lN gene is down regulated at translation level in L24 mutant, however the precise mechanism still remains unknown. We report here that in an L24 mutant strain, the expression of lac-lN and GST-lN is decreased to 25% and 50% of that in wild type T83 strain respectively. Strikingly, the yield of GST-lN fusion protein in L24 mutant can be restored to the level as in T83 wild type strain by changing the two codons upstream lN stop codon. These findings imply that the stop codon and its context are involved in the translation regulation. The possible reason is that the translation termination complex containing L24 mutant ribosome may not dissociate prop-erly in stop code region. This failure of disengagement from mRNA will slow down the process of following ribosomes, and consequently decrease the efficiency of lN gene expression.
