We investigated the lobular localization and molecular level of expression of cholesterol 7 alpha-hydroxylase and sterol 27-hydroxylase, two key enzymes in bile acid synthesis, in isolated periportal and pericentral hepatocytes and by in situ hybridization of rat liver. Enzyme activity, mRNA, and gene transcription of cholesterol 7 alpha-hydroxylase were predominant in pericentral hepatocytes o...

In all structurally characterized bacterial multicomponent monooxygenase (BMM) hydroxylase proteins, a series of hydrophobic cavities in the α-subunit trace a conserved path from the protein exterior to the carboxylate-bridged diiron active site. This study examines these cavities as a potential route for transport of dioxygen to the active site by crystallographic characterization of a xenon-p...

Previously, we have identified a number of morphine- and cyclic AMP-regulated phosphoproteins (MARPPs) in the rat locus coeruleus (LC) and other brain regions. We now show that one of these phosphoproteins, a 58 kDa protein designated MARPP-58, is tyrosine hydroxylase. First, MARPP-58 comigrates with immunolabeled, immunoprecipitated, and purified tyrosine hydroxylase on 1- and 2-dimensional el...

We enlarged the uniconazole (UNI) molecule to find a specific inhibitor of abscisic acid (ABA) 8'-hydroxylase, and synthesized various UNI derivatives that were substituted with hydrophilic and hydrophobic groups at the 4-chlorine of the phenyl group of UNI using click chemistry. Considering its potency in ABA 8'-hydroxylase inhibition, its small effect on seedling growth, and its ease of appli...

Adenovirus is a vector for the delivery of genes mainly to the liver. Short-term (approximately 3 days) studies using adenovirus transfection have provided valuable insights into how genes can complement normal and pathological phenotypes. When atherosclerosis-susceptible C57BL/6 mice were infected with an adenovirus vector containing the human 7alpha-hydroxylate cDNA (AV17h1) and fed on a chow...

Ipomeamarone 15-hydroxylase activity was found in a microsomal fraction from cut-injured and Ceratocystis fimbriata-infected sweet potato (Ipomoea batatas Lam. cv. Norin No. 1) root tissues and its optimum pH was 8.0. The enzyme reaction required O(2) and NADPH. The K(m) values calculated for ipomeamarone and NADH were approximately 60 and 2 micromolar, respectively. NADPH alone had little effe...

The effect of cholesterol feeding (3 g/day) on bile acid synthesis was examined in 10 New Zealand white rabbits (NZW), 8 Watanabe heterozygous and 10 homozygous rabbits with partial and complete deficiencies of LDL receptors. After 10 days of cholesterol feeding, bile fistulas were constructed and bile acid pool sizes were measured. Cholesterol feeding increased plasma and hepatic cholesterol l...

An enzymatic activity responsible for the hydroxylation of CMP-NeuAc into CMP-N-glycolylneuraminic acid (CMP-NeuGc) was found in the cytosolic fraction after cellular fractionation of the mucosa of rat small intestine. It was maximum in the presence of NADPH or NADH, but it was reduced by 50% by addition of 1 mM EDTA. The Km value for CMP-NeuAc was 0.6 microM. The CMP-NeuAc hydroxylase activity...

The timely detection of newborns with congenital phenylketonuria, in which the metabolism amino acid phenylalanine is disturbed due to lack enzyme hydroxylase, remains an urgent issue. Increase level and its toxic products cell leads severe brain damage, manifests itself form mental retardation. Prompt diagnosis phenylketonuria can prevent dementia serious disorders. aim work a comprehensive st...

The deacetylcephalosporin C synthetase (hydroxylase) gene from Streptomyces clavuligerus has been cloned and sequenced. The open reading frame codes for a protein with an Mr of 34,584. The hydroxylase gene (cefF) is closely linked to the epimerase gene (cefD) and the expandase gene (cefE) and is transcribed in the opposite orientation. The hydroxylase and expandase genes are 59 and 71% identica...