6fzw
From Proteopedia
Crystal structure of the metalloproteinase enhancer PCPE-1 bound to the procollagen C propeptide trimer (long)
Structural highlights
DiseaseCO3A1_HUMAN Defects in COL3A1 are a cause of Ehlers-Danlos syndrome type 3 (EDS3) [MIM:130020; also known as benign hypermobility syndrome. EDS is a connective tissue disorder characterized by hyperextensible skin, atrophic cutaneous scars due to tissue fragility and joint hyperlaxity. EDS3 is a form of Ehlers-Danlos syndrome characterized by marked joint hyperextensibility without skeletal deformity.[1] Defects in COL3A1 are the cause of Ehlers-Danlos syndrome type 4 (EDS4) [MIM:130050. EDS is a connective tissue disorder characterized by hyperextensible skin, atrophic cutaneous scars due to tissue fragility and joint hyperlaxity. EDS4 is the most severe form of the disease. It is characterized by the joint and dermal manifestations as in other forms of the syndrome, characteristic facial features (acrogeria) in most patients, and by proneness to spontaneous rupture of bowel and large arteries. The vascular complications may affect all anatomical areas.[2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [:][12] [13] [:][14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] Defects in COL3A1 are a cause of susceptibility to aortic aneurysm abdominal (AAA) [MIM:100070. AAA is a common multifactorial disorder characterized by permanent dilation of the abdominal aorta, usually due to degenerative changes in the aortic wall. Histologically, AAA is characterized by signs of chronic inflammation, destructive remodeling of the extracellular matrix, and depletion of vascular smooth muscle cells.[26] [27] [28] FunctionCO3A1_HUMAN Collagen type III occurs in most soft connective tissues along with type I collagen. Publication Abstract from PubMedProcollagen C-proteinase enhancer-1 (PCPE-1) is a secreted protein that specifically accelerates proteolytic release of the C-propeptides from fibrillar procollagens, a crucial step in fibril assembly. As such, it is a potential therapeutic target to improve tissue repair and prevent fibrosis, a major cause of mortality worldwide. Here we present the crystal structure of the active CUB1CUB2 fragment of PCPE-1 bound to the C-propeptide trimer of procollagen III (CPIII). This shows that the two CUB domains bind to two different chains of CPIII and that the N-terminal region of one CPIII chain, close to the proteolytic cleavage site, lies in the cleft between CUB1 and CUB2. This suggests that enhancing activity involves unraveling of this chain from the rest of the trimer, thus facilitating the action of the proteinase involved. Support for this hypothesis comes from site-directed mutagenesis, enzyme assays, binding studies, and molecular modeling. Structural Basis for the Acceleration of Procollagen Processing by Procollagen C-Proteinase Enhancer-1.,Pulido D, Sharma U, Vadon-Le Goff S, Hussain SA, Cordes S, Mariano N, Bettler E, Moali C, Aghajari N, Hohenester E, Hulmes DJS Structure. 2018 Jul 12. pii: S0969-2126(18)30243-0. doi:, 10.1016/j.str.2018.06.011. PMID:30078642[29] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. Loading citation details.. Citations 0 reviews cite this structure No citations found See AlsoReferences
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