Journal article
Covalent coupling of rat liver phenylalanine hydroxylase
Brain research bulletin, v 3(4), pp 391-394
Jul 1978
PMID: 318209
Abstract
Optimal conditions have been determined for the coupling of rat liver phenylalanine hydroxylase (Phe H) to cyanogen bromide-Sepharose 4B. When 8 mg of ligand was reacted with 100 mg of matrix, 20 to 30 percent of the initial enzyme activity was covalently bound along with 90 percent of the protein. The coupled enzyme showed greater thermal stability from 40° to 60°, a broader base of optimal pH activity from 5.8 to 10.0, more resistance to proteolysis and less inhibition by various inhibitors. The uncoupled enzyme exhibited greater storage stability at 25° after 24 hr and at 0° after 18 days. Alteration of the microenvironment by introduction of sulfhydryl groups or of carriers having positive or negative charges had variable effects on the hydroxylase activity.
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Details
- Title
- Covalent coupling of rat liver phenylalanine hydroxylase
- Creators
- Benjamin Weiss - Island InstituteMaria Hui - Island InstituteAbel Lajtha - Island Institute
- Publication Details
- Brain research bulletin, v 3(4), pp 391-394
- Publisher
- Elsevier
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Pharmacology and Physiology
- Web of Science ID
- WOS:A1978FM54500013
- Scopus ID
- 2-s2.0-0018071704
- Other Identifier
- 991020836345104721