Cyclophilins are ubiquitous enzymes that are involved in protein folding, signal transduction, viral proliferation, oncogenesis, and regulation of the immune system. Cyclophilin A is the prototype of the cyclophilin family. We use molecular dynamics to describe the catalytic mechanism of cyclophilin A in full atomistic detail by sampling critical points along the reaction coordinate, and use ac...

The release of cytochrome c from the mitochondrial intermembrane space is a decisive event in programmed cell death. Once in the cytoplasm, cytochrome c is involved in the formation of the macromolecular complex termed apoptosome, which activates procaspase-9 which in turn activates downstream procaspase-3. There are increasing evidence indicating that cyclophilin A is highly expressed in many ...

The chaperonin GroEL and the peptidyl-prolyl cis-trans isomerase cyclophilin are major representatives of two distinct cellular systems that help proteins to adopt their native three-dimensional structure: molecular chaperones and folding catalysts. Little is known about whether and how these proteins cooperate in protein folding. In this study, we have examined the action of GroEL and cyclophi...

Objective (s) Porin is a mitochondrial outer membrane channel, which usually functions as the pathway for the movement of various substances in and out of the mitochondria and is considered to be a component of the permeability transition (PT) pore complex that plays a role in the PT. We addressed the hypothesis that porin interacts with other mitochondrial proteins after ischemic injury. Mater...

Cyclophilin, a specific cyclosporin A-binding protein has been purified to homogeneity from human spleen and bovine thymus cytosol. Purification of bovine and human cyclophilin was achieved by large scale molecular filtrations, Matrex Blue A affinity chromatography, preparative isoelectric focusing, phenyl-Sepharose chromatography, and weak cation exchange high performance liquid chromatography...

background: allergy is a clinical disorder affecting the human population with wide geographical distribution. platanus orientalis (p. orientalis) trees are planted in many countries and their pollen causes allergic reactions. cyclophilin has recently been identified as one of the most important allergens of p. orientalis pollen. we aimed to clone and purify this allergen in escherichia coli fo...

CD147, also known as extracellular matrix metalloproteinase inducer, is a regulator of matrix metalloproteinase production and also serves as a signaling receptor for extracellular cyclophilins. Previously, we demonstrated that cell surface expression of CD147 is sensitive to cyclophilin-binding drug cyclosporin A, suggesting involvement of a cyclophilin in the regulation of intracellular trans...

A full-length cDNA clone encoding cyclophilin gene of 848 bp, including a 519 bp open reading frame, has been isolated from the cDNA library constructed from etiolated seedlings of Vigna mungo (GenBank FN668732). The cDNA sequence showed 97% identity with Vigna radiata cyclophilin mRNA. The sequence was GC rich and lacked introns. The open reading frame encoded 172 amino acid polypeptide with m...

BACKGROUND Hepatitis C Virus (HCV) infection is a leading indication for liver transplantation. HCV infection reoccurs almost universally post transplant, decreasing both graft longevity and patient survival. The immunosuppressant, cyclosporine A (CsA) has potent anti-HCV activity towards both HCV replicons and the genotype 2a cell culture infectious virus. Previously, we isolated mutations in ...

BACKGROUND Vascular disease in diabetes is initiated by monocyte adhesion to vascular endothelium, transmigration and formation of foam cells. Increasing clinical evidence supports a role for the secretory protein, cyclophilin A in diabetic vascular disease. The means by which cyclophilin A contributes to vascular lesion development in diabetes is however largely unknown. METHODS In this stud...