文献类型： 外文期刊

作者： Zheng, H. F. ¹ ; Bai, Z. Y. ¹ ; Lin, J. Y. ¹ ; Wang, G. L. ¹ ; Li, J. L. ¹ ;

作者机构： 1.Shanghai Ocean Univ, Minist Agr, Key Lab Freshwater Aquat Genet Resources, Shanghai, Peoples R China

2.Chinese Acad Fishery Sci, East China Sea Fisheries Res Inst, Key Lab East China Sea & Ocean Fishery Resources, Minist Agr, Shanghai, Peoples R China

3.Shanghai Ocean Univ, E Inst Shanghai Univ, Aquaculture Div, Shanghai, Peoples R China

关键词： HcCS1;Triangle sail mussel;Sequence and structure analysis;Expression profiles

期刊名称：GENETICS AND MOLECULAR RESEARCH （ 影响因子：0.764； 五年影响因子：0.912 ）

ISSN： 1676-5680

年卷期： 2015 年 14 卷 4 期

页码：

收录情况： SCI

摘要： The triangle sail mussel, Hyriopsis cumingii, is the most important freshwater pearl mussel in China. However, the mechanisms underlying its chitin-mediated shell and nacre formation remain largely unknown. Here, we characterized a chitin synthase (CS) gene (HcCS1) in H. cumingii, and analyzed its possible physiological function. The complete ORF sequence of HcCS1 contained 6903 bp, encoding a 2300-amino acid protein (theoretical molecular mass = 264 kDa; isoelectric point = 6.22), and no putative signal peptide was predicted. A myosin motor head domain, a CS domain, and 12 transmembrane domains were found. The predicted spatial structures of the myosin head and CS domains were similar to the electron microscopic structure of the heavy meromyosin subfragment of chicken smooth muscle myosin and the crystal structure of bacterial cellulose synthase, respectively. This structural similarity indicates that the functions of these two domains might be conserved. Quantitative reverse transcription PCR results showed that HcCS1 was present in all detected tissues, with the highest expression levels detected in the mantle. The HcCS1 transcripts in the mantle were upregulated following shell damage from 12 to 24 h post-damage, and they peaked (approximately 1.5-fold increase) at 12 h after shell damage. These findings suggest that HcCS1 was involved in shell regeneration, and that it might participate in shell and nacre formation in this species via chitin synthesis. HcCS1 might also dynamically regulate chitin deposition during the process of shell and nacre formation with the help of its conserved myosin head domain.