This is a default text for your page Serine protease 57 (PRSS57). Click above on edit this page to modify. Be careful with the < and > signs.
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NSP4 is found in the telomeric region of the chromosome 19.
Function
NSP4 is one of the neutrophile serine protease in the cytoplasmic granules of neutrophils.
Disease
Claire
Relevance
Structural highlights
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The protein has a 283 amino-acids long sequence with two mainly domains
. It forms a kind of elongate sphere of approximately 70Å large and 150Å long (dimensions: 70,37Å X 70,37Å X 105,02Å). The protein is composed of signal peptide (1-31) which leads to the location in azurophil granules
[1] and allows its excretion. In addition there is a protease domain (32-283) which is a trypsin-like domain with a trypsin-like active site, according to the specificity for P1-Arg residues, but this domain can be an elastase-like active site according to the primary sequence (because of the presence of a swallow S1 pocket) specific to small aliphatic residues.
[3]
The active is form by 4 amino acids: Gly(189), Phe(190, Ser(216), D(226)
The residue F190 obstructs the active site which could normally not links a P1-Arg. However, a study [4] considered the possibility that the two residues S216 and F190 of the active site can form a flexible gate which allows P1-Arg to enter. Then, the link between the active site and P1-Arg can be stabilized by a salt bridge interaction between S1-D226 and P1-Arg.
The hypothesis of the flexible gate was confirmed by the same study. The mutations of S216 only, F190 only or both together show a forced full open gate is more efficient than a forced partially open gate.
The conclusion is that the protease domain is a trypsin-like domain.
