Abstract：
:In this study, we detail the specificity of an aspartic peptidase from Rhizomucor miehei and evaluate the effects of this peptidase on clotting milk using the peptide sequence of k-casein (Abz-LSFMAIQ-EDDnp) and milk powder. Molecular mass of the peptidase was estimated at 37 kDa, and optimum activity was achieved at pH 5.5 and 55 °C. The peptidase was stable at pH values ranging from 3 to 5 and temperatures of up 45 °C for 60 min. Dramatic reductions in proteolytic activity were observed with exposure to sodium dodecyl sulfate, and aluminum and copper (II) chloride. Peptidase was inhibited by pepstatin A, and mass spectrometry analysis identified four peptide fragments (TWSISYGDGSSASGILAK, ASNGGGGEYIFGGYDSTK, GSLTTVPIDNSR, and GWWGITVDRA), similar to rhizopuspepsin. The analysis of catalytic specificity showed that the coagulant activity of the peptidase was higher than the proteolytic activity and that there was a preference for aromatic, basic, and nonpolar amino acids, particularly methionine, with specific cleavage of the peptide bond between phenylalanine and methionine. Thus, this peptidase may function as an important alternative enzyme in milk clotting during the preparation of cheese.
journal_name
J Ind Microbiol Biotechnoljournal_title
Journal of industrial microbiology & biotechnologyauthors
da Silva RR,Souto TB,de Oliveira TB,de Oliveira LC,Karcher D,Juliano MA,Juliano L,de Oliveira AH,Rodrigues A,Rosa JC,Cabral Hdoi
10.1007/s10295-016-1780-4subject
Has Abstractpub_date
2016-08-01 00:00:00pages
1059-69issue
8eissn
1367-5435issn
1476-5535pii
10.1007/s10295-016-1780-4journal_volume
43pub_type
杂志文章abstract：:The use of proteomics for direct detection of expressed pathways producing natural products has yielded many new compounds, even when used in a screening mode without a bacterial genome sequence available. Here we quantify the advantages of having draft DNA-sequence available for strain-specific proteomics using the l...
journal_title：Journal of industrial microbiology & biotechnology
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journal_title：Journal of industrial microbiology & biotechnology
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journal_title：Journal of industrial microbiology & biotechnology
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journal_title：Journal of industrial microbiology & biotechnology
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journal_title：Journal of industrial microbiology & biotechnology
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journal_title：Journal of industrial microbiology & biotechnology
pub_type： 杂志文章
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更新日期：2005-09-01 00:00:00
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journal_title：Journal of industrial microbiology & biotechnology
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journal_title：Journal of industrial microbiology & biotechnology
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journal_title：Journal of industrial microbiology & biotechnology
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journal_title：Journal of industrial microbiology & biotechnology
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journal_title：Journal of industrial microbiology & biotechnology
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journal_title：Journal of industrial microbiology & biotechnology
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journal_title：Journal of industrial microbiology & biotechnology
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journal_title：Journal of industrial microbiology & biotechnology
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