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Extracellular proteases from haloarchaea (halolysins) can resist high salt conditions. In this study, the gene encoding a halolysin from Halococcus salifodinae was identified. The hlyA gene encoded an active halolysin with the classical Asp-His-Ser catalytic triad of serine proteases. Site-directed mutagenesis showed that the three cysteine residues in the catalytic domain were important for the extracellular proteolytic activity and displayed an additive effect on the activity. Truncation mutants of the C-terminal extension (CTE) domain displayed very low or almost no extracellular protease activity towards milk and small peptide substrates, indicating its importance for the function of HlyA. CTE can be functionally interchangeable among halolysins. Additionally, the HlyA expressing strain as a starter culture for fish sauce fermentation significantly increased the peptide release and total free amino acid content in fish sauce. This study enriches our knowledge of the key amino acid residues and domains of halolysins, and provides an opportunity for applications of halolysins in fish sauce fermentation.
This article was published in the following journal.
Name: Microbiological research
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Enzyme of the human immunodeficiency virus that is required for post-translational cleavage of gag and gag-pol precursor polyproteins into functional products needed for viral assembly. HIV protease is an aspartic protease encoded by the amino terminus of the pol gene.
Extracellular protease inhibitors that are secreted from FIBROBLASTS. They form a covalent complex with SERINE PROTEASES and can mediate their cellular internalization and degradation.
A secreted serine protease that contains a Kazal domain-like region and a C-terminal PDZ domain. It has a broad range of targets that include EXTRACELLULAR MATRIX PROTEINS; PROTEOGLYCANS; and INSULIN-LIKE GROWTH FACTOR BINDING PROTEINS. Mutations in the HTRA1 gene are associated with AGE-RELATED MACULAR DEGENERATION 7 and Cerebral Autosomal Recessive Arteriopathy with Subcortical Infarcts and Leukoencephalopathy (CARASIL).
A mammalian beta-hexosaminidase isoform that is a heteromeric protein comprized of both hexosaminidase alpha and hexosaminidase beta subunits. Deficiency of hexosaminidase A due to mutations in the gene encoding the hexosaminidase alpha subunit is a case of TAY-SACHS DISEASE. Deficiency of hexosaminidase A and HEXOSAMINIDASE B due to mutations in the gene encoding the hexosaminidase beta subunit is a case of SANDHOFF DISEASE.
Retroviral proteins, often glycosylated, coded by the envelope (env) gene. They are usually synthesized as protein precursors (POLYPROTEINS) and later cleaved into the final viral envelope glycoproteins by a viral protease.
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