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lüll Components of the collagen prolyl 3-hydroxylation complex are crucial for normal bone development Marini JC; Cabral WA; Barnes AM; Chang WCell Cycle 2007[Jul]; 6 (14): 1675-81Prolyl 3-hydroxylase 1 (P3H1), cartilage-associated protein (CRTAP) and cyclophilin B (CyPB) form a complex in the endoplasmic reticulum which is responsible for 3-hydroxylation of a limited number of proline residues in types I, II and V collagens. In this complex, CRTAP serves the role of helper protein, while P3H1 provides the enzymatic activity for the modification. In type I collagen, the major protein of the extracellular matrix of bone, the complex 3-hydroxylates only the a1(I)Pro986 residue. P3H1 and CRTAP each also have independent roles as components of matrix. Furthermore, the two proteins have significant homology with each other. The critical importance of the components of the complex for normal bone development has been revealed by a Crtap knock-out mouse and by infants and children with null mutations of CRTAP and LEPRE1, the gene that encodes P3H1. On a clinical level, defects in the components of the prolyl 3-hydroxylation complex have been shown to be the long-sought cause of severe and lethal recessive osteogenesis imperfecta.|*Bone and Bones/cytology/pathology/physiology[MESH]|*Extracellular Matrix/chemistry/metabolism[MESH]|Amino Acid Sequence[MESH]|Animals[MESH]|Bone Development/*physiology[MESH]|Collagen Type I/genetics/metabolism[MESH]|Cyclophilins/genetics/metabolism[MESH]|Extracellular Matrix Proteins/genetics/metabolism[MESH]|Humans[MESH]|Hydroxylation[MESH]|Membrane Glycoproteins/genetics/*metabolism[MESH]|Molecular Chaperones[MESH]|Molecular Sequence Data[MESH]|Multiprotein Complexes/metabolism[MESH]|Osteogenesis Imperfecta/genetics/metabolism[MESH]|Peptidylprolyl Isomerase/genetics/metabolism[MESH]|Prolyl Hydroxylases[MESH]|Proteoglycans/genetics/*metabolism[MESH]|Sequence Alignment[MESH] |