NDLI: Prediction of folding stability and degradability of thede novo designed protein MB-1 in cow rumen

Content Provider	Springer Nature Link
Author	MacCallum, Jilian D. Hefford, Mary A. Omar, Semir Beauregard, Marc
Copyright Year	1997
Abstract	The authors have recently reported on the design of a protein (MB-1) enriched in methionine, threonine, lysine, and leucine. The protein is intended to be produced by rumen bacteria, in a way that would provide high producing lactating cows with limiting amino acids. In this report, MB-1 stability in the rumen is assessed, i.e., where the protein might be found after cell lysis or after being secreted by rumen bacteria. Current in vitro methods used to predict proteolytic degradability in the rumen were used for MB-1, as well as other natural proteins for comparison. MB-1 was found to be more susceptible to degradation than cytochrome c and ribonuclease A. Data indicate that MB-1 will be rapidly degraded if exposed to the rumen environment without protection. The contribution of folding stability to proteolytic stability was also examined. Rumen liquor components were selected to formulate a solution compatible with constraints of thermal denaturation studies. Denaturation curves show that the natural proteins were folded at rumen temperature. The MB-1 denaturation curves indicated that MB-1 does not unfold in a cooperative transition when heated from 20 to 70‡C. This suggests that MB-1 structure may be progressively modified as temperature increases, and that a continuum of conformations are available to MB-1. At 39‡C, a significant (50%) portion of MB-1 molecules had their tertiary structure unfolded, contributing to proteolytic degradability. Despite the unusual constraints used in MB-1 design (i.e., a maximized content in selected essential amino acids), results show that MB-1 has structural properties similar to previously reportedde novo designed proteins.
Starting Page	83
Ending Page	93
Page Count	11
File Format	PDF
ISSN	02732289
Journal	Applied Biochemistry and Biotechnology
Volume Number	66
Issue Number	1
e-ISSN	15590291
Language	English
Publisher	Humana Press
Publisher Date	1997-01-01
Publisher Place	Totowa
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Biotechnology Biochemistry
Content Type	Text
Resource Type	Article
Subject	Medicine Molecular Biology Environmental Engineering Biochemistry Bioengineering Applied Microbiology and Biotechnology Biotechnology

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