High-resolution structure of a Kazal-type serine protease inhibitor from the dengue vector Aedes aegypti.
Torquato, R.J.S., Lu, S., Martins, N.H., Tanaka, A.S., Pereira, P.J.B.(2017) Acta Crystallogr F Struct Biol Commun 73: 469-475
- PubMed: 28777090 
- DOI: https://doi.org/10.1107/S2053230X17010007
- Primary Citation of Related Structures:  
5DAE - PubMed Abstract: 
Blood-feeding exoparasites are rich sources of protease inhibitors, and the mosquito Aedes aegypti, which is a vector of Dengue virus, Yellow fever virus, Chikungunya virus and Zika virus, is no exception. AaTI is a single-domain, noncanonical Kazal-type serine proteinase inhibitor from A. aegypti that recognizes both digestive trypsin-like serine proteinases and the central protease in blood clotting, thrombin, albeit with an affinity that is three orders of magnitude lower. Here, the 1.4 Å resolution crystal structure of AaTI is reported from extremely tightly packed crystals (∼22% solvent content), revealing the structural determinants for the observed inhibitory profile of this molecule.
Organizational Affiliation: 
Department of Biochemistry, Escola Paulista de Medicina, Universidade Federal de São Paulo (UNIFESP), Rua 3 de Maio 100, 04044-020 São Paulo-SP, Brazil.