Search results for "Cytochrome b5 reductase"
showing 4 items of 4 documents
Tonoplast subcellular localization of maize cytochrome b5 reductases
2000
Plant cytochrome b 5 reductases (b 5 R) are assumed to be part of an ER-associated redox chain that oxidizes NADH to provide electrons via cytochrome b5 (cyt b 5 ) to ER-associated fatty acyl desaturase and related hydroxylases, as in mammalian cells. Here we report on cDNA cloning of a novel maize b 5 R, NFR II, strongly related to a previously cloned cDNA, NFR I (Bagnaresi et al., 1999, Biochem, J. 338, 499-5051. Maize b 5 R isoforms are produced by a small multi-gene family. The NFR cDNAs were shown to encode active b 5 Rs by heterologous expression in yeast. Both reductases, in addition to Fe 3+ -chelates, efficiently reduced Cu 2+ -chelates. Using a polyclonal antibody able to recogniz…
Isoenzyme-specific phosphorylation of cytochromes P-450 and other drug metabolizing enzymes.
1987
Abstract A series of fourteen cytochrome P-450 isoenzymes was treated with three different protein kinases and found to devide into isoenzymes phosphorylated (i) by both the cyclic AMP-dependent kinase and the calcium-phospholipid-dependent kinase (P-450 PB 3a and PB 2e), (ii) by none of these kinases (P-450 PB 1b, MC 1b, UT 1, and thromboxane synthase), and (iii) by either the cyclic AMP-dependent kinase (P-450 LM 2, PB 2d, and PB 3b) or the calcium-phospholipid-dependent kinase (P-450 PB 1a, PB 2a, MC 1a, LM 3c, and LM 4). Other components of the monooxygenase system, cytochrome P-450 reductase, cytochrome b5, cytochrome b5 reductase as well as microsomal epoxide hydrolase, were poor subs…
Studies on the Biosynthesis of Microsomal Membrane Proteins. Site of Synthesis and Mode of Insertion of Cytochrome b5, Cytochrome b5 Reductase, Cytoc…
1982
The site of synthesis and mechanism of insertion into membranes of several microsomal polypeptides was studied using translation system programmed in vitro with polysomes or with mRNA extracted from free and membrane-bound rat liver polysomes. Primary translation products of cytochrome b5, NADH: cytochrome b5 oxidoreductase, NADPH: cytochrome P-450 oxidoreductase and epoxide hydrolase were isolated by specific immunoprecipitation and compared with the mature proteins. The following observations were made: 1 While cytochrome b5 and NADH: cytochrome b5 oxidoreductase are synthesized in free polysomes, NADPH: cytochrome P-450 oxidoreductase and epoxide hydrolase are made in membrane-bound poly…
Overexpression of CYB5R3 and NQO1, two NAD+-producing enzymes, mimics aspects of caloric restriction
2018
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