Abstract:
:Primary hyperoxaluria type I (PH1) is a rare disease caused by the deficit of liver alanine-glyoxylate aminotransferase (AGT). AGT prevents oxalate formation by converting peroxisomal glyoxylate to glycine. When the enzyme is deficient, progressive calcium oxalate stones deposit first in the urinary tract and then at the systemic level. Pyridoxal 5'-phosphate (PLP), the AGT coenzyme, exerts a chaperone role by promoting dimerization, as demonstrated by studies at protein and cellular level. Thus, variants showing a destabilized dimeric structure should, in principle, be responsive to vitamin B6, a precursor of PLP. However, models to predict the extent of responsiveness of each variant are missing. We examined the effects of pathogenic interfacial mutations by combining bioinformatic predictions with molecular and cellular studies on selected variants (R36H, G42E, I56N, G63R, and G216R), in both their holo- (i.e., with bound PLP) and apo- (i.e., without bound PLP) form. We found that all variants displayed structural alterations mainly related to the apoform and consisting of an altered tertiary and quaternary structure. G216R also shows a strongly reduced catalytic efficiency. Moreover, all but G216R respond to vitamin B6, as shown by their increased specific activity and expression level in a cellular disease model. A global analysis of data unraveled a possible inverse correlation between the degree of destabilization/misfolding induced by a mutation and the extent of B6 responsiveness. These results provide a first explanation of factors influencing B6 response in PH1, a model possibly valuable for other rare diseases caused by protein deficits.
journal_name
J Inherit Metab Disjournal_title
Journal of inherited metabolic diseaseauthors
Dindo M,Oppici E,Dell'Orco D,Montone R,Cellini Bdoi
10.1007/s10545-017-0105-8subject
Has Abstractpub_date
2018-03-01 00:00:00pages
263-275issue
2eissn
0141-8955issn
1573-2665pii
10.1007/s10545-017-0105-8journal_volume
41pub_type
杂志文章abstract::For over two decades, nitisinone (NTBC) has been successfully used to manipulate the tyrosine degradation pathway and save the lives of many children with hereditary tyrosinaemia type 1. More recently, NTBC has been used to halt homogentisic acid accumulation in alkaptonuria (AKU) with evidence suggesting its efficacy...
journal_title:Journal of inherited metabolic disease
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journal_title:Journal of inherited metabolic disease
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journal_title:Journal of inherited metabolic disease
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journal_title:Journal of inherited metabolic disease
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journal_title:Journal of inherited metabolic disease
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journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1007/BF01799171
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journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
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journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章,评审
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journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1007/BF01805473
更新日期:1985-01-01 00:00:00
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journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1023/b:boli.0000005603.04633.21
更新日期:2003-01-01 00:00:00
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journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1007/s10545-013-9587-1
更新日期:2013-03-01 00:00:00
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journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1007/s10545-006-0370-4
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journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
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journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章,评审
doi:10.1002/jimd.12104
更新日期:2020-01-01 00:00:00
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journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1007/BF00711518
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journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1007/BF01799870
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journal_title:Journal of inherited metabolic disease
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journal_title:Journal of inherited metabolic disease
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journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章,评审
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更新日期:2006-10-01 00:00:00
abstract::Glutaric aciduria type I (GA1) is a preventable cause of acute brain damage in early childhood, leading to a severe dystonic-dyskinetic disorder that is similar to cerebral palsy and ranges from extreme hypotonia to choreoathetosis to rigidity with spasticity. Degeneration of the putamen and caudate typically occurs b...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章,评审
doi:10.1023/a:1005390105171
更新日期:1998-06-01 00:00:00
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journal_title:Journal of inherited metabolic disease
pub_type: 社论
doi:10.1007/s10545-018-00250-0
更新日期:2018-11-01 00:00:00
abstract::The mutation N370S accounts for 63% of the mutated glucocerebrosidase alleles of Portuguese type 1 Gaucher patients. It has been shown previously that this mutation is linked to the Pv1.1- form of the PvuII polymorphism and suggested that the N370S mutation in glucocerebrosidase alleles has an Ashkenazi Jewish origin....
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1007/BF00735401
更新日期:1994-01-01 00:00:00
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journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章,评审
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更新日期:1995-01-01 00:00:00
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journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1007/s10545-015-9909-6
更新日期:2016-03-01 00:00:00
abstract::By using ion-exchange chromatography and gas chromatography coupled with mass spectrometry, the content of phenylalanine, tyrosine and their metabolites typical of phenylketonuria (PKU) was determined in the cerebrospinal fluid (CSF) of 8 untreated children with classical PKU and 9 controls. At the same time, plasma a...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
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更新日期:1991-01-01 00:00:00
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journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
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更新日期:1993-01-01 00:00:00
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journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
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更新日期:2004-01-01 00:00:00