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Cathepsin S, but not cathepsin L, participates in the MHC class II-associated invariant chain processing in large yellow croaker (Larimichthys crocea).
- Source :
-
Fish & shellfish immunology [Fish Shellfish Immunol] 2015 Dec; Vol. 47 (2), pp. 743-50. Date of Electronic Publication: 2015 Oct 22. - Publication Year :
- 2015
-
Abstract
- Two cysteine proteases, cathepsin S (CatS) and cathepsin L (CatL), have been identified as the key enzymes involved in the processing of invariant chain (Ii chain) in mammals. However, little is known about the roles of fish cathepsins in the Ii chain processing. In this study, large yellow croaker cathepsin S (LycCatS) and L (LycCatL) were identified and characterized. Based on the sequence comparison and phylogenetic analysis, both LycCatS and LycCatL are highly conserved to their counterparts in teleost. These two cathepsins were constitutively expressed in all tissues and immune-related cells tested, although at different levels. Both recombinant LycCatS (rLycCatS) and LycCatL (rLycCatL) possess the typical cysteine protease activity. Like other mammalian endopeptidase cathepsins, rLycCatS and rLycCatL could be autocatalytically activated to remove propeptides and release active mature peptides. On the other hand, the autocatalytic activation of rLycCatL could be inhibited by recombinant large yellow croaker Ii chain (rLyc-TR-Ii), but the autocatalytic activation of rLycCatS was not affected by rLyc-TR-Ii. Furthermore, the activated rLycCatS can efficiently process rLyc-TR-Ii in a stepwise manner in vitro, while the activated rLycCatL can not. These data indicate that cathepsin S may be the main cathepsin involved in the Ii chain processing in bony fish.<br /> (Copyright © 2015 Elsevier Ltd. All rights reserved.)
- Subjects :
- Animals
Antigens, Differentiation, B-Lymphocyte metabolism
Cathepsin L metabolism
Cathepsins metabolism
Fish Proteins metabolism
Histocompatibility Antigens Class II metabolism
Molecular Sequence Data
Perciformes metabolism
Antigens, Differentiation, B-Lymphocyte genetics
Cathepsin L genetics
Cathepsins genetics
Fish Proteins genetics
Genes, MHC Class II
Histocompatibility Antigens Class II genetics
Perciformes genetics
Perciformes immunology
Subjects
Details
- Language :
- English
- ISSN :
- 1095-9947
- Volume :
- 47
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Fish & shellfish immunology
- Publication Type :
- Academic Journal
- Accession number :
- 26475363
- Full Text :
- https://doi.org/10.1016/j.fsi.2015.10.009