Structure of a lectin from the sea mussel Crenomytilus grayanus (CGL)
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- 作者：Michał Jakó ; b ; Jacek Lubkowski ; Barry R. O'Keefe and Alexander Wlodawer
- 关键词：lectin ; molecular replacement ; carbohydrate binding ; structure comparison ; &beta ; -trefoil
- 刊名：Acta Crystallographica Section F
- 出版年：2015
- 出版时间：November 2015
- 年：2015
- 卷：71
- 期：11
- 页码：1429-1436
- 全文大小：1652K
- ISSN：1744-3091
文摘
CGL is a 150 amino-acid residue lectin that was originally isolated from the sea mussel Crenomytilus grayanus. It is specific for binding GalNAc/Gal-containing carbohydrate moieties and in general does not share sequence homology with other known galectins or lectins. Since CGL displays antibacterial, antifungal and antiviral activities, and interacts with high affinity with mucin-type receptors, which are abundant on some cancer cells, knowledge of its structure is of significant interest. Conditions have been established for the expression, purification and crystallization of a recombinant variant of CGL. The crystal structure of recombinant CGL was determined and refined at a resolution of 2.12 Å. The amino-acid sequence of CGL contains three homologous regions (73% similarity) and the folded protein has a β-trefoil topology. Structural comparison of CGL with the closely related lectin MytiLec allowed description of the glycan-binding pockets.