植物中HECT和U-box基因的結(jié)構(gòu)與進(jìn)化研究
[Abstract]:E3 ubiquitin ligase is a highly diverse and important enzyme group, and they are involved in the ubiquitin proteasome pathway together with 26s proteasome. E3 ubiquitin ligase promotes the transfer of ubiquitin group to substrate protein. This ubiquitin label degrades the substrate protein. In this way, E3 ubiquitin ligase (. HECT (homologous to E6-associated protein C-terminus) and U-box (a modified RING motif without the full complement of Zn2-binding ligands) are two important E3 ubiquitin ligases which play an important role in many plant cytological and physiological processes. At present, the distribution, structure, evolution and function of E3 ubiquitin ligases in plant genomes are not completely clear. Based on the prediction of HECT and U-box genes in plant genomes, the structure and evolution of HECT and U-box genes in these plants and their possible biological functions were analyzed. The structure and evolution of HECT gene in soybean genome were analyzed. The sequence structure and evolution process of HECT gene in soybean genome were analyzed. The results showed that there were 19 HECT genes in soybean genome. According to phylogenetic relationship and domain organization, these genes can be divided into 7 groups. Importantly, the increase in the number of HECT genes in these soybeans is due to repeated events in evolutionary processes. Fifteen HECT genes were detected in 14 soybean tissues. The 15 detected HECT genes were relatively high in floral and bud tissues, but relatively low in other tissues. For each detected soybean HECT gene, the HECT gene of group VI was relatively high in most tissues. 2. 2. The structure and evolution of HECT gene in other plant genomes predicted the HECT gene of 40 plant species. It was found that HECT gene was found in all the tested plants, but there was a great difference in quantity. HECT genes in higher plants can be divided into 7 groups according to their evolutionary relationships. In addition to group II, each HECT group had corresponding lineal homologous genes of Arabidopsis thaliana. The HECT domain of HECT gene in all plants is very conserved and contains a large number of highly conserved amino acid residues. In addition, the selection pressure analysis of homologous HECT genes showed that these genes were strongly negatively selected, and the functional differences occurred between the three pairs of homologous subgroups. 3. The structure and evolution of U-box gene in soybean genome were analyzed. The results showed that there were 127 U-box genes in soybean genome. These U-box genes can be divided into three subfamilies according to evolutionary relationship and domain organization. Subfamily I mainly contains Kinase domain, subfamily II mainly contains ARM domain, and subfamily III family only contains U-box domain. It was also found that the amplification of these genes was mainly caused by repeated fragment events and tandem repeats in the evolution of soybean. Most of the 98 U-box genes expressed in soybean were relatively high in flower tissue, young leaf tissue, root nodule tissue and pod tissue at different stages. However, the expression was relatively low in the seed tissues at different stages. In conclusion, HECT and U-box genes in plant genomes were predicted by bioinformatics, and their structures and evolution were systematically analyzed. The results of the study can further deepen the understanding of the important function of E3 ligase in the regulation of plant gene expression.
【學(xué)位授予單位】:西北農(nóng)林科技大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2016
【分類(lèi)號(hào)】:Q943.2
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