Isolation, structural analysis, and expression characteristics of the maize (Zea mays L.) hexokinase gene family

文献类型： 外文期刊

第一作者： Zhang, Zhongbao

作者： Zhang, Zhongbao;Zhang, Jiewei;Chen, Yajuan;Li, Ruifen;Wang, Hongzhi;Ding, Liping;Wei, Jianhua;Zhang, Zhongbao;Zhang, Jiewei;Chen, Yajuan;Li, Ruifen;Wang, Hongzhi;Ding, Liping;Wei, Jianhua

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关键词： Maize;Abiotic stress;Hexokinase;Expression behavior;Cis-elements

期刊名称：MOLECULAR BIOLOGY REPORTS （ 影响因子：2.316； 五年影响因子：2.357 ）

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收录情况： SCI

摘要： Hexokinases (HXKs, EC 2.7.1.1) play important roles in metabolism, glucose (Glc) signaling, and phosphorylation of Glc and fructose and are ubiquitous in all organisms. Despite their physiological importance, the maize HXK (ZmHXK) genes have not been analyzed systematically. We isolated and characterized nine members of the ZmHXK gene family which were distributed on 3 of the 10 maize chromosomes. A multiple sequence alignment and motif analysis revealed that the maize ZmHXK proteins share three conserved domains. Phylogenetic analysis revealed that the ZmHXK family can be divided into four subfamilies. We identified putative cis-elements in the ZmHXK promoter sequences potentially involved in phytohormone and abiotic stress responses, sugar repression, light and circadian rhythm regulation, Ca2+ responses, seed development and germination, and CO2-responsive transcriptional activation. To study the functions of maize HXK isoforms, we characterized the expression of the ZmHXK5 and ZmHXK6 genes, which are evolutionarily related to the OsHXK5 and OsHXK6 genes from rice. Analysis of tissue-specific expression patterns using quantitative real time-PCR showed that ZmHXK5 was highly expressed in tassels, while ZmHXK6 was expressed in both tassels and leaves. ZmHXK5 and ZmHXK6 expression levels were upregulated by phytohormones and by abiotic stress.

分类号： Q7

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