4o8i
From Proteopedia
1.45A resolution structure of PEG 400 Bound Cyclophilin D
Structural highlights
Function[PPIF_HUMAN] PPIases accelerate the folding of proteins. It catalyzes the cis-trans isomerization of proline imidic peptide bonds in oligopeptides. Involved in regulation of the mitochondrial permeability transition pore (mPTP). It is proposed that its association with the mPTP is masking a binding site for inhibiting inorganic phosphate (Pi) and promotes the open probablity of the mPTP leading to apoptosis or necrosis; the requirement of the PPIase activity for this function is debated. In cooperation with mitochondrial TP53 is involved in activating oxidative stress-induced necrosis. Involved in modulation of mitochondrial membrane F(1)F(0) ATP synthase activity and regulation of mitochondrial matrix adenine nucleotide levels. Has anti-apoptotic activity independently of mPTP and in cooperation with BCL2 inhibits cytochrome c-dependent apoptosis.[1] [2] Publication Abstract from PubMedCyclophilin D (CypD) is a key mitochondrial target for amyloid-beta-induced mitochondrial and synaptic dysfunction and is considered a potential drug target for Alzheimer's disease. The high-resolution crystal structures of primitive orthorhombic (CypD-o) and primitive tetragonal (CypD-t) forms have been determined to 1.45 and 0.85 A resolution, respectively, and are nearly identical structurally. Although an isomorphous structure of CypD-t has previously been reported, the structure reported here was determined at atomic resolution, while CypD-o represents a new crystal form for this protein. In addition, each crystal form contains a PEG 400 molecule bound to the same region along with a second PEG 400 site in CypD-t which occupies the cyclosporine A inhibitor binding site of CypD. Highly precise structural information for CypD should be extremely useful for discerning the detailed interaction of small molecules, particularly drugs and/or inhibitors, bound to CypD. The 0.85 A resolution structure of CypD-t is the highest to date for any CypD structure. High-resolution crystal structures of two crystal forms of human cyclophilin D in complex with PEG 400 molecules.,Valasani KR, Carlson EA, Battaile KP, Bisson A, Wang C, Lovell S, ShiDu Yan S Acta Crystallogr F Struct Biol Commun. 2014 Jun;70(Pt 6):717-22. doi:, 10.1107/S2053230X14009480. Epub 2014 May 24. PMID:24915078[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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