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Vitamin D-binding protein (DBP), also/originally known as gc-globulin (group-specific component), is a protein that in humans is encoded by the GC gene. [ 5 ] [ 6 ] DBP is genetically the oldest member of the albuminoid family and appeared early in the evolution of vertebrates.
Vitamin D response element (VDRE) is a type of DNA sequence that is found in the promoter region of vitamin D regulated genes. This sequence binds the vitamin D receptor (VDR), when complexed with calcitriol (1,25(OH) 2 D), the active form of vitamin D, and so regulates the expression of many genes.
In molecular biology, Vitamin D binding protein domain III protein domain is predominantly found in Vitamin D binding proteins (DBP). Vitamin D-binding protein (DBP)(also referred to as Gc-globulin) is synthesized primarily in the liver. This entry outlines the domain III of DBP. Domain III (amino acid 379–458) is G-actin binding region ...
Metabolites produced from vitamin D 2 tend to bind less well to the vitamin D-binding protein. [ 3 ] Vitamin D 3 can alternatively be hydroxylated to calcifediol by sterol 27-hydroxylase (CYP27A1), but vitamin D 2 cannot.
Transcription of the CYP24A1 gene is markedly inducible by 1,25-(OH) 2 D 3 binding to the vitamin D receptor. [6] The gene has a strong, positive vitamin D response element in the promoter . Through regulation of CYP24A1 expression, a negative feedback control system is created to limit the effects of 1,25-(OH) 2 D 3 .
The vitamin D receptor (VDR also known as the calcitriol receptor) is a member of the nuclear receptor family of transcription factors. [5] Calcitriol (the active form of vitamin D , 1,25-(OH) 2 vitamin D 3 ) binds to VDR, which then forms a heterodimer with the retinoid-X receptor .
Image credits: saturatedsilence We were also lucky enough to get in touch with Laura Watson, Cat Welfare Assistant at International Cat Care and Registered Veterinary Nurse, for this piece. Laura ...
CYP2R1 is cytochrome P450 2R1, an enzyme which is the principal vitamin D 25-hydroxylase. [5] [6] In humans it is encoded by the CYP2R1 gene located on chromosome 11p15.2. [7]It is expressed in the endoplasmic reticulum in liver, where it performs the first step in the activation of vitamin D by catalyzing the formation of 25-hydroxyvitamin D. [8]
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