Table 1.

Properties of VDR

Molecular mass	50 kDa (human VDR)
Kd
1,25-(OH)2D	10−10m
25-OHD	10−8m
Isoelectric point	6.2
Tissue concentration	0.01–1 pmol/mg protein
	200–25,000 copies/cell
Structural variants
VDR-A (f-allele)	427 Amino acids
VDR-A (F-allele)	424 Amino acids, by alternative translation start site
VDR-B1	477 Amino acids, by N-terminal extension
Polymorphisms
Large number in 5′ promoter	cdx-2
N terminal	Fok I
C terminal	BsmI, ApaI, TaqI, TruI, polyA microsatellite