中文摘要：

基质金属蛋白酶（matrix metalloproteinases,MMP）是一种能够降解细胞外基质的蛋白水解酶。MMP-17是一种膜型基质金属蛋白酶,通过糖基磷脂酰肌醇连接于细胞表面,参与调控有机体的内环境稳定、宿主防御等多种生理过程。为研究MMP-17在马氏珠母贝免疫反应中的作用,实验运用RACE技术,克隆得到马氏珠母贝MMP-17（Pinctada martensii MMP,PmMMP-17）基因c DNA全长序列,并对其序列特征及功能进行初步分析。结果显示,Pm-MMP-17基因c DNA全长2 794 bp,开放阅读框（ORF）为1 923 bp,编码640个氨基酸,5＇UTR长156bp,3＇UTR长715 bp,分子量约为73.11 ku,等电点为8.98;多序列比对和系统进化树分析表明,Pm-MMP-17与其他物种的MMP具有较高的保守性,与长牡蛎的MMP-17相似性高达82%;功能结构域分析表明,Pm-M M P-17有5个高度保守的结构区域：N-末端的信号肽、前导区、催化区、铰链区和C-末端的类血红素结合蛋白区;荧光定量数据分析表明,Pm-MMP-17基因在马氏珠母贝的闭壳肌、珍珠囊、足、外套膜、血淋巴、肝胰腺、性腺、鳃等8个组织中均有表达,在血液中的表达量最高,闭壳肌和鳃次之;脂多糖（LPS）刺激后,Pm-MMP-17基因表达水平上调,12 h后达到最大值,之后又逐渐下调并恢复到正常水平。研究表明,Pm-MMP-17基因可能在马氏珠母贝的免疫反应中起着重要作用。

英文摘要：

Matrix metalloproteinases（ MMPs） could degrade the extracellular matrix and participate in various physiological processes,such as homeostasis and immune response. M M P-17 is one membrane type M M P that attaches to the cell surface by Glycosyl-phosphatidyl inositol（ GPI）,and participates in various physiological processes,such as organic homeostasis and immune defense. The pearl oyster Pinctada martensii is the main species cultured for marine pearl production in China. To deliberate the function of M M P-17 in the immune response of P. martensii,in this study,using rapid amplification of c DNA ends（ RACE） technology,we have obtained the full length sequence of Pinctada martensii MMP（ Pm-MMP-17）c DNA and analyzed its sequence characteristics and function. Our results show ed that the c DNA full length of Pm-MMP-17 is 2 794 bp,including 156 bp of 5＇ UTR,715 bp of 3＇ UTR,and 1 923 bp of open reading frame（ ORF） encoding 640 amino acid residues with an estimated molecular mass of 73. 11 ku and theoretical isoelectric point of 8. 98. M ulti-sequence alignment and phylogenetic analysis results show ed that Pm-M M P-17 was highly homologous with that from other species and had 82% sequence identity with Crassostrea gigas M M P-17. Amino acid sequence analysis show ed Pm-M M P-17 had five conservative domains： signal peptide,propeptide,catalytic domain,hinge region and hemopexin-like domain. M eanw hile,real-time PCR analysis show ed that Pm-MMP-17 was ubiquitously expressed in all tissues detected,including adductor muscle,pearl sac,foot,mantle,hemolymph,hepatopancreas,gonads and gills,with the highest expression level in hemolymph,follow ed by adductor muscle and gill. Previous research has show ed that Pm-MMP-17 was highly expressed in the eosinophils and involved in the regulation of cell migration,growth and differentiation. We supposed that the highly expression of Pm-MMP-17 gene in the hemolymph was crucial for the migration of hemolymph in the body of pearl oyster. After LPS stimulati