Novel Kazal-type proteinase inhibitors from the skin secretion of the Splendid leaf frog, Cruziohyla calcarifer

Publication date: June 2017 Source:EuPA Open Proteomics, Volume 15 Author(s): Carolina Proaño-Bolaños, Renjie Li, Mei Zhou, Lei Wang, Xinping Xi, Elicio E. Tapia, Luis A. Coloma, Tianbao Chen, Chris Shaw Peptidase inhibitors have an important role controlling a variety of biological processes. Here, we employed a peptidomic approach including molecular cloning, tandem mass spectrometry and enzymatic assays to reveal 7 Kazal-type proteinase inhibitors (CCKPs) (18 variants) in the skin secretion of the unexplored frog, Cruziohyla calcarifer. All 18 proteins shared the Kazal pattern C-X(7)-C-X(6,7)-C-X(6,7)-Y-X(3)-C-X(2)-C-X(15-21)-C and 3 disulphide bridges. Based on structural comparative analysis, we deemed trypsin and chymotrypsin inhibitory activity in CCKP-1, 4 and CCKP 2, 5, 7, respectively. These peptidase inhibitors presumably play a role to control the balance between other functional peptides produced in the amphibian skin secretions. Graphical abstract
Source: EuPA Open Proteomics - Category: Bioinformatics Source Type: research