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Structure of the PCCA gene and distribution of mutations causing propionic acidemia.

Abstract：

:Propionyl-CoA carboxylase (PCC, EC 6.4.1.3) is a mitochondrial, biotin-dependent enzyme that functions in the catabolism of branched-chain amino acids, fatty acids with odd-numbered chain lengths, and other metabolites. It catalyzes the ATP-dependent carboxylation of propionyl-CoA to d-methylmalonyl-CoA. PCC is composed of two types of subunits, likely as alpha4beta4 or alpha6beta6, with the alpha subunit containing the covalently bound biotin prosthetic group. A genetic deficiency of PCC activity causes propionic acidemia, a potentially fatal disease with onset in severe cases in the newborn period. Affected patients may have mutations of either the PCCA or PCCB gene. In this study, we have determined the structure of the human PCCA gene which, at the present time, is only partially represented in the databases. Based on reported ESTs and confirmed by RT-PCR, we also redefine the translation initiation codon to a position 75 nucleotides upstream of the currently accepted initiation codon. We show the distribution of mutations, including three identified in this study, and renumber all reported mutations to count from the new initiation codon. The gene spans more than 360 kb and consists of 24 exons ranging from 37 to 335 bp in length. The introns range in size from 104.bp to 66 kb. We have also determined the nucleotide sequence of approximately 1 kb of the 5'-flanking region upstream of the ATG translation initiation site. The proximal 400 bp of the 5'-flanking region shows a high G + C content (67%) and is part of a putative 1-kb CpG island that extends into exon 1 and part of intron 1. The putative promoter lacks a TATA box but contains two AP-1 sites and a conservatively defined consensus GC box, the latter characteristic of the core binding sequence of the Sp1 transcription factor.

journal_name

Mol Genet Metab

journal_title

Molecular genetics and metabolism

authors

Campeau E,Desviat LR,Leclerc D,Wu X,Pérez B,Ugarte M,Gravel RA

doi

10.1006/mgme.2001.3210

subject

Has Abstract

pub_date

2001-09-01 00:00:00

pages

238-47

issue

1-2

eissn

1096-7192

issn

1096-7206

pii

S1096-7192(01)93210-X

journal_volume

74

pub_type

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