Journal
FEBS JOURNAL
Volume 277, Issue 18, Pages 3823-3832Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1742-4658.2010.07785.x
Keywords
catalytic antibody; cytokine; proteolysis; TNF-alpha
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Funding
- Japan Science and Technology Agency
- Ministry of Education, Culture, Sports, Science and Technology of Japan
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It has long been an important task to prepare a catalytic antibody capable of digesting a targeting crucial protein that controls specific life functions. Tumor necrosis factor-alpha (TNF-alpha) is a cytokine and an important molecule concerned with autoimmune diseases such as rheumatoid arthritis, chronic obstructive pulmonary disease, and Crohn's disease. A mAb (ETNF-6 mAb) raised against human TNF-alpha was prepared, and the steric conformation was created by using molecular modeling after the cDNA was sequenced. The heavy chain (ETNF-6-H) of the mAb was considered to possess a catalytic triad-like structure in the complementarity determining regions (CDRs). As a result, ETNF-6-H exhibited a peptidase and a protease activity. In fact, ETNF-6-H predominantly cleaved the Ser5-Arg6 bond of TNF-alpha at the first step, resulting in the generation of a fragment of similar to 17 kDa. This fragment was digested to a smaller molecule of 15 kDa by scission of the Gln21-Ala22 bond. The intermediate product was further converted into a fragment of 13.3 kDa by successive cleavage of the Leu36-Leu37 and Asn39-Gly40 bonds. The heavy chain possessed a protease activity against TNF-alpha with a multicleavage site.
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