Molecular cloning and characterization of hatching enzyme-like geneII (BmHELII) in the silkworm, Bombyx mori

文献类型： 外文期刊

第一作者： Tang, Shunming

作者： Tang, Shunming;Wu, Jun;Zhao, Xinhui;Wang, Huanying;Qiu, Zhiyong;Shen, Xingjia;Guo, Xijie;Tang, Shunming;Qiu, Zhiyong;Shen, Xingjia;Guo, Xijie

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关键词： Bioinformatic analysis;Bombyx mori;Expression pattern;Hatching enzyme-like gene II;Spermatogenesis

期刊名称：BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS （ 影响因子：3.575； 五年影响因子：3.381 ）

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收录情况： SCI

摘要： Hatching enzyme (HE) is an enzyme that digests an egg envelop at the time of embryo hatching. Previously, we have reported a kind of . Bombyx mori hatching enzyme-like gene (BmHEL). In this paper, the full length of another . BmHEL cDNA sequence (BmHELII, GenBank ID: . JN627443) was cloned from bluish-silkworm-eggs. The cDNA was 977. bp in length with an open reading frame of 885. bp which encodes a polypeptide of 294 amino acids including a putative signal peptide of 16 amino acid residues and a mature protein of 278 amino acids. The deduced . BmHELII had a predicted molecular mass of 33.62. kDa, isoelectric point of 5.44 and two conserved signature sequences of astacin family. Bioinformatic analysis results showed that the deduced protease domain amino acid sequence of BmHELII had 29.5-87.0% identities to that of HE identified in the other species. The . BmHELII gene structure was 6-exon-5-intron, and the promoter region harbored some basal promoter elements and some embryo development related transcription factor binding sites. Semi-quantitative RT-PCR analysis revealed that the relative level of . BmHELII transcripts at different stages during egg incubation increased with the development of embryos and reached to a maximum just before hatching, hence declined gradually after hatching. The spatio-temporal expression pattern of . BmHELII basically resembled that of hatching enzyme gene. Moreover, the . BmHELII transcript was detected in testis of the silkworm, and semi-quantitative RT-PCR analysis showed that it kept at the high level in testis of silkworm from larvae to moth, which suggested that BmHELII might take part in the development of sperm. These results will be helpful to provide a molecular basis for understanding the mechanism underlying silkworm hatching as well as spermatogenesis.

分类号： Q5

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