Structural Evidence of Intramolecular Propeptide Inhibition of the Aspzincin Metalloendopeptidase Asap1.
Bogdanovic, X., Palm, G.J., Schwenteit, J., Singh, R.K., Gudmundsdottir, B.K., Hinrichs, W.(2016) FEBS Lett 590: 3280
- PubMed: 27528449 
- DOI: https://doi.org/10.1002/1873-3468.12356
- Primary Citation of Related Structures:  
2X3A, 2X3B, 2X3C - PubMed Abstract: 
The Gram-negative bacterium Aeromonas salmonicida is a fish pathogen for various fish species worldwide. Aeromonas salmonicida subsp. achromogenes produces the extracellular, toxic zinc endopeptidase AsaP1. Crystal structure analyses at 2.0 Å resolution of two proteolytically inactive AsaP1 variants show the polypeptide folding of the protease domain and the propeptide domain. These first crystal structure analyses of a precursor of a deuterolysin-like aspzincin protease provide insights into propeptide function, and specific substrate binding. A lysine side chain of the propeptide binds in the hydrophobic S1'-pocket interacting with three carboxylate side chains. An AsaP1 variant with a lysine to alanine exchange identifies the chaperone function of the propeptide.
Organizational Affiliation: 
Department of Molecular Structural Biology, Institute for Biochemistry, University of Greifswald, Germany.