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PPIF
Peptidyl-prolyl cis-trans isomerase, mitochondrial (PPIF) is an enzyme that in humans is encoded by the ''PPIF'' gene. It has also been referred to as, but should not be confused with, cyclophilin D (CypD), which is encoded by the ''PPID'' gene.〔(【引用サイトリンク】 url = http://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=10105 )〕 As a member of the peptidyl-prolyl cis-trans isomerase (PPIase) family, this protein catalyzes the cis-trans isomerization of proline imidic peptide bonds, which allows it to facilitate folding or repair of proteins.〔 PPIF is a major component of the mitochondrial permeability transition pore (MPTP) and, thus, highly involved in mitochondrial metabolism and apoptosis, as well as in mitochondrial diseases and related conditions, including cardiac diseases, neurodegenerative diseases, and muscular dystrophy. In addition, PPIF participates in inflammation, as well as in ischemic reperfusion injury, AIDS, and cancer.
== Structure ==
Like other cyclophilins, PPIF forms a β-barrel structure with a hydrophobic core. This β-barrel is composed of eight anti-parallel β-strands and capped by two α-helices at the top and bottom. In addition, the β-turns and loops in the strands contribute to the flexibility of the barrel.〔 PPIF weighs 17.5 kDa and forms part of the MPTP in the inner mitochondrial membrane (IMM).〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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