Reactome: A Curated Pathway Database
Results 1 to 10 of 11
Pathways (9) Reactions (1) Proteins (1) Others (0)
Protein: UniProt:O15528 CYP27B1 (Homo sapiens)
Last changed: 2015-03-12 14:00:50

Pathway: Metabolism (Homo sapiens)
Metabolic processes in human cells generate energy through the oxidation of molecules consumed in the diet and mediate the synthesis of diverse essential molecules not taken in the diet as well as the inactivation and elimination of toxic ones generated endogenously or present in the extracellular environment. The processes of energy metabolism can be classified into two groups according to whether the
Last changed: 2015-03-06 23:15:47

Pathway: Metabolism of steroid hormones and vitamin D (Homo sapiens)
Steroid hormones are synthesized primarily in the adrenal gland and gonads. They regulate energy metabolism and stress responses (glucocorticoids), salt balance (mineralocorticoids), and sexual development and function (androgens and estrogens). All steroids are synthesized from cholesterol. Steroid hormone synthesis is largely regulated at the initial steps of cholesterol mobilization and transport in
Last changed: 2015-03-06 23:15:47

Pathway: Biological oxidations (Homo sapiens)
All organisms are constantly exposed to foreign chemicals every day. These can be man-made (drugs, industrial chemicals) or natural (alkaloids, toxins from plants and animals). Uptake is usually via ingestion but inhalation and transdermal routes are also common. The very nature of many chemicals that make them suitable for uptake by these routes, in other words their lipophilicty (favours fat so
Last changed: 2015-03-06 23:15:47

Pathway: Metabolism of lipids and lipoproteins (Homo sapiens)
Lipids are hydrophobic but otherwise chemically diverse molecules that play a wide variety of roles in human biology. They include ketone bodies, fatty acids, triacylglycerols, phospholipids and sphingolipids, eicosanoids, cholesterol, bile salts, steroid hormones, and fat-soluble vitamins. They function as a major source of energy (fatty acids, triacylglycerols, and ketone bodies), are major constitue
Last changed: 2015-03-06 23:15:47

Pathway: Phase 1 - Functionalization of compounds (Homo sapiens)
Phase 1 of metabolism is concerned with functionalization , that is the introduction or exposure of functional groups on the chemical structure of a compound. This provides a 'handle' for phase 2 conjugating species with which to react with. Many xenobiotics are lipophilic and almost chemically inert (e.g. PAHs) so would not necessarily undergo a phase 2 reaction. Making them more chemical
Last changed: 2015-03-06 23:15:47

Pathway: Steroid hormones (Homo sapiens)
Active steroid hormones are produced from the precursor cholesterol.The steps involved in the biosynthesis of the adrenal steroid hormones, corticosterone, cortisol, and aldosterone; and the gonadal steroid hormones, progesterone, estradiol, and testosterone are annotated here. The enzymes that catalyze these reactions fall into two major classes of proteins: the cytochrome P450 heme-containing protein
Last changed: 2015-03-06 23:15:47

Pathway: Vitamins (Homo sapiens)
A number of CYPs can act upon vitamins
Last changed: 2015-03-06 23:15:47

Pathway: Vitamin D (calciferol) metabolism (Homo sapiens)
Vitamin D3 (cholecalciferol) is a steroid hormone that plays a role in regulating calcium and bone metabolism. It is obtained from the diet and produced in the skin by photolysis of 7-dehydrocholesterol and released into the bloodstream. Only a few food sources have significant amounts of vitamins D2 and D3 but many foodstuffs nowadays are fortified with vitamin D. The metabolites of vitamin D3 are car
Last changed: 2015-03-06 18:40:03

Pathway: Cytochrome P450 - arranged by substrate type (Homo sapiens)
The P450 isozyme system is the major phase 1 biotransforming system in man, accounting for more than 90% of drug biotransformations. This system has huge catalytic versatility and a broad substrate specificity, acting upon xenobiotica and endogenous compounds. It is also called the mixed-function oxidase system, the P450 monooxygenases and the heme-thiolate protein system. All P450 enzymes are a gr
Last changed: 2015-03-06 23:15:47

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