禽鹦鹉热嗜性衣原体PmpD基因N端区的克隆与表达

为探讨禽鹦鹉热嗜性衣原体PmpD基因的生物学功能,本实验根据禽类鹦鹉热嗜性衣原体Cal-10株全基因序列设计引物,用PCR法扩增禽嗜性衣原体PmpD基因N端区,将特异性目的基因片段克隆入PBS-TII载体,经测序后确认为目的基因,并提交GenBank。试验扩增的禽鹦鹉热嗜性衣原体Cal株PmpD基因与禽鹦鹉热衣原体6BC株的PmpD基因和氨基酸序列的相似性均达99%,与流产衣原体成员嗜流产衣原体S26/3株、嗜豚鼠衣原体(GPIC)、嗜猫衣原体(Fe/C-56)核苷酸相似性分别为89%、82%和77%。PmpD基因N端区基因亚克隆到pET-32a(+)载体上,重组表达载体转化BL21(DE3)表达宿主菌,以IPTG诱导该重组菌,结果表达了约63 ku大小的融合蛋白;分别用禽鹦鹉热嗜性衣原体多克隆抗体、猪、羊流产嗜性衣原体多克隆抗体与表达出的重组蛋白进行Western blotting检测,结果表明该蛋白与禽源衣原体多克隆抗体呈阳性反应,与猪、羊源衣原体多克隆抗体呈阴性反应,显示该重组蛋白具有种属特异性。本研究首次表达了禽类鹦鹉热嗜性衣原体PmpD基因的N端区的重组蛋白,为进一步研究其生物学功能提供依据。

Cloning and prokaryotic expression of N-domain of PmpD gene of Chlamydophila psittaci

In order to explore the function of the PmpD gene in preventing and diagnose of the avian,the N-domain of the PmpD gene was cloned by PCR method based on the whole gene sequence of the avian Chlamydophila psittaci CAL-10 strain.Specific target gene was cloned into the PBS-TII vector and identified by the sequence analysis.The target gene and deduced peptide sequence were compared to the N-domain gene sequence of the characterized C.psittaci 6BC strain.They were found to be 99% identical to the N-domain gene...