Mass spectrometry-based determination of Kallikrein-related peptidase 7 (KLK7) cleavage preferences and subsite dependency View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2017-12

AUTHORS

Lakmali Munasinghage Silva, Thomas Stoll, Thomas Kryza, Carson Ryan Stephens, Marcus Lachlan Hastie, Helen Frances Irving-Rodgers, Ying Dong, Jeffrey John Gorman, Judith Ann Clements

ABSTRACT

The cleavage preferences of Kallikrein-related peptidase 7 (KLK7) have previously been delineated using synthetic peptide libraries of fixed length, or single protein chains and have suggested that KLK7 exerts a chymotryptic-like cleavage preference. Due to the short length of the peptides utilised, only a limited number of subsites have however been assessed. To determine the subsite preferences of KLK7 in a global setting, we used a mass spectrometry (MS)-based in-depth proteomics approach that utilises human proteome-derived peptide libraries of varying length, termed Proteomic Identification of protease Cleavage Sites (PICS). Consistent with previous findings, KLK7 was found to exert chymotryptic-like cleavage preferences. KLK7 subsite preferences were also characterised in the P2-P2' region, demonstrating a preference for hydrophobic residues in the non-prime and hydrophilic residues in the prime subsites. Interestingly, single catalytic triad mutant KLK7 (mKLK7; S195A) also showed residual catalytic activity (kcat/KM = 7.93 × 102 s-1M-1). Catalytic inactivity of KLK7 was however achieved by additional mutation in this region (D102N). In addition to characterising the cleavage preferences of KLK7, our data thereby also suggests that the use of double catalytic triad mutants should be employed as more appropriate negative controls in future investigations of KLK7, especially when highly sensitive MS-based approaches are employed. More... »

PAGES

6789

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/s41598-017-06680-4

DOI

http://dx.doi.org/10.1038/s41598-017-06680-4

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1090882953

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/28754951


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41 schema:description The cleavage preferences of Kallikrein-related peptidase 7 (KLK7) have previously been delineated using synthetic peptide libraries of fixed length, or single protein chains and have suggested that KLK7 exerts a chymotryptic-like cleavage preference. Due to the short length of the peptides utilised, only a limited number of subsites have however been assessed. To determine the subsite preferences of KLK7 in a global setting, we used a mass spectrometry (MS)-based in-depth proteomics approach that utilises human proteome-derived peptide libraries of varying length, termed Proteomic Identification of protease Cleavage Sites (PICS). Consistent with previous findings, KLK7 was found to exert chymotryptic-like cleavage preferences. KLK7 subsite preferences were also characterised in the P2-P2' region, demonstrating a preference for hydrophobic residues in the non-prime and hydrophilic residues in the prime subsites. Interestingly, single catalytic triad mutant KLK7 (mKLK7; S195A) also showed residual catalytic activity (k<sub>cat</sub>/K<sub>M</sub> = 7.93 × 10<sup>2</sup> s<sup>-1</sup>M<sup>-1</sup>). Catalytic inactivity of KLK7 was however achieved by additional mutation in this region (D102N). In addition to characterising the cleavage preferences of KLK7, our data thereby also suggests that the use of double catalytic triad mutants should be employed as more appropriate negative controls in future investigations of KLK7, especially when highly sensitive MS-based approaches are employed.
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