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两株鹦鹉热衣原体主要外膜蛋白基因的克隆与序列分析

Cloning and sequence analysis of the major outer membrane protein genes of two Chlamydia psittaci strains.

作者信息

Zhang Y X, Morrison S G, Caldwell H D, Baehr W

机构信息

Laboratory of Microbial Structure and Function, National Institute of Allergy and Infectious Diseases, Hamilton, Montana 59840.

出版信息

Infect Immun. 1989 May;57(5):1621-5. doi: 10.1128/iai.57.5.1621-1625.1989.

Abstract

We cloned and sequenced the gene encoding the major outer membrane protein (MOMP) of two Chlamydia psittaci strains, guinea pig inclusion conjunctivitis (GPIC) strain 1, and meningopneumonitis (Mn) strain Cal-10. Intraspecies alignment of the two C. psittaci MOMP genes revealed 80.6% similarity, and interspecies comparison of C. trachomatis and C. psittaci MOMP genes yielded about 68% similarity. As found previously for C. trachomatis MOMP sequences, stretches of predominantly conserved sequences of GPIC and Mn MOMPs were interrupted by four variable domains whose locations were identical to those of C. trachomatis MOMPs. Seven of eight cysteine residues were found at precisely the same positions in GPIC, Mn, and C. trachomatis MOMPs, emphasizing their importance in structure and function of the protein. Collectively, these results indicate that C. psittaci and C. trachomatis MOMP genes diverged from a common ancestor.

摘要

我们克隆并测序了编码两种鹦鹉热衣原体菌株主要外膜蛋白(MOMP)的基因,这两种菌株分别是豚鼠包涵体结膜炎(GPIC)1型菌株和脑膜肺炎(Mn)Cal - 10菌株。两种鹦鹉热衣原体MOMP基因的种内比对显示相似性为80.6%,沙眼衣原体和鹦鹉热衣原体MOMP基因的种间比较产生了约68%的相似性。如先前在沙眼衣原体MOMP序列中所发现的那样,GPIC和Mn MOMP主要保守序列的片段被四个可变结构域打断,其位置与沙眼衣原体MOMP的可变结构域相同。在GPIC、Mn和沙眼衣原体MOMP中,八个半胱氨酸残基中有七个位于完全相同的位置,这突出了它们在该蛋白质结构和功能中的重要性。总体而言,这些结果表明鹦鹉热衣原体和沙眼衣原体MOMP基因源自一个共同祖先。

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