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http://dx.doi.org/10.5352/JLS.2013.23.3.347

Synthesis and Secretion of Mutant Mannose-Binding Lectin  

Jang, Ho-Jung (Department of Clinical Laboratory Science, Dong-Eui University)
Chung, Kyung Tae (Department of Clinical Laboratory Science, Dong-Eui University)
Publication Information
Journal of Life Science / v.23, no.3, 2013 , pp. 347-354 More about this Journal
Abstract
Innate immunity is the ability to differentiate infectious agents from self. The innate immune system is comprised of a complicated network of recognition and effector molecules that act together to protect the host in the early stage of an infectious challenge. Mannose-binding lectin (MBL or mannose-binding protein, MBP) belongs to the family of $Ca^{2+}$-dependent lectins (C-type lectin with a collagen-like domain), which are considered an important component of innate immunity. While it is associated with increased risk and severity of infections and autoimmunity, the most frequent immuno-deficiency syndrome was reported to be low MBL level in blood. Deficiency of human MBL is caused by mutations in the coding region of the MBL gene. Rat homologue gene of human MBL gene was used to study functions of wild type and mutant MBL proteins. Although extensive studies have yielded the structural information of MBL, the functions of MBL, especially mutant MBL, still require investigation. We previously reported the cloning of rat wild-type MBL gene and the production of a truncated form of MBL protein and its antibody. Here, we present the cloning of mutant MBL cDNA in collagen-like domain (R40C, G42D, and G45E) using site-directed mutagenesis and differential behaviors of wild type and mutant MBL in cells. The major difference between wild type and mutant MBL was that while wild type MBL was secreted, mutant MBL was inhibited for secretion, retained in endoplasmic reticulum, and still functioned as a lectin.
Keywords
Endoplasmic reticulumn Secretion; Genetic disease; Immunodeficiency; Mannose-binding lectin;
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