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Staphylococcus aureus is a dangerous human pathogen characterized by alarmingly increasing antibiotic resistance. Accumulating evidence suggests the role of Spl proteases in staphylococcal virulence. Spl proteases have restricted, non-overlapping substrate specificity, suggesting that they may constitute a first example of a proteolytic system in bacteria. SplA, SplB, and SplD were previously characterized in terms of substrate specificity and structural determinants thereof. Here we analyze the substrate specificity of SplE documenting its unique P1 preference among Spl proteases and, in fact, among all chymotrypsin-like (family S1) proteases characterized to date. This is interesting since our understanding of the general aspects of proteolysis is based on seminal studies of S1 family members. To better understand the molecular determinants of the unusual specificity of SplE, the crystal structure of the protein is determined here. Conclusions from structural analysis are evaluated by successful grafting of SplE specificity on the scaffold of SplB protease.
A major cause of visual impairment, corneal dystrophies result from accumulation of protein deposits in the cornea. One of the proteins involved is transforming growth factor β-induced protein (TGFBIp), an extracellular matrix component that interacts with integrins but also produces corneal deposits when mutated. Human TGFBIp is a multi-domain 683-residue protein, which contains one CROPT domain and four FAS1 domains. Its structure spans ∼120 Å and reveals that vicinal domains FAS1-1/FAS1-2 and FAS1-3/FAS1-4 tightly interact in an equivalent manner. The FAS1 domains are sandwiches of two orthogonal four-stranded β sheets decorated with two three-helix insertions. The N-terminal FAS1 dimer forms a compact moiety with the structurally novel CROPT domain, which is a five-stranded all-β cysteine-knot solely found in TGFBIp and periostin. The overall TGFBIp architecture discloses regions for integrin binding and that most dystrophic mutations cluster at both molecule ends, within domains FAS1-1 and FAS1-4.
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