Gene: [13q32/PCCA] propionyl-CoA carboxylase, alpha polypeptide; glycinemia ketotic I (propionicacidemia I);

FUN

[1] Systematic name: propanoyl-CoA:carbon dioxide ligase (ADP-forming).
[2]-The catalyzed reaction: ATP + propanoyl-CoA + HCO(3-) = ADP + orthophosphate + (S)-methylmalonyl-CoA."

MOP

Active propionyl-CoA carboxylase (abiotin-dependent mitochondrial enzyme)is a heterotetramer consisting of alpha (MM 75 kD; 2.9 kb mRNA) and beta (MM 60 kD; 4.5 and 2 kb mRNA) peptides."

FAG

The gene for beta subunit of propionyl-CoA carboxylase is mapped to chr 3q: GEM:03q2/PCCB."

PAT

[1] The main defect is the deficient propionate carboxylation (due to propionyl-CoA carboxylase defect). Generalized disturbance of amino acid utilization occurs, that leads to excessive deaminization of some amino acids in muscles with the consequent hyperammonemia and ketoacidosis.
[2] The main symptoms are: periodic vomiting, hypersomnia, protein intolerance, arrest of development, ketosis, neutropenia, hypogammaglobulinemia, periodic thrombocytopenia."

HET

[1] Glycinemia and glycinuria are cardinal symptoms in several genetically independent hereditary metabolic defects. Only two of them, those related with this propionyl-CoA carboxylase, are mapped (glycinemia II is determined by beta subunit defect; see GEM:03q2/PCCB).
[2] The remaining types are not yet specified enough: iminoglycinuria II (MIM:242600, recessive) and I (MIM:138500, dominant formally, but MIM considers it rather as the heterozygous manifestation of type II), as well as all types of nonketotic hyperglycinemia (isolated, i.e. without ketoacidosis, leucopenia, and thrombocytopenia). The genes for the nonketotic hyperglycinemia types are identified: GEM:09p2/GCSP (MIM 238300), GEM:03p21/GCST (MIM:238310), GEM:00.0/GCSH (MIM:238330), and GEM:00.0/GCSL (MIM:238331).
[2] Ketoacidosis with vomiting, as well as neutropenia and thrombocytopenia are not characteristic for isolated (nonketotic) hyperglycinemia. Glycin is the only amino acid which serum and urine levels are elevated."

HIS

The glycinemic syndrome was first described Childs et al. in 1961.

PRO

Gene-specific DNA probe pPCC9-5 is a 2.0 kb fragment cloned at BamHI site in the plasmid pCD ( Scambler-1986; Hay-1986)."

POL

Enzyme Alleles in kb/(Popul Freq) Reference; Probe number
[1] HindIII A1= 4.4/(0.25); A2= 4.2/(0.75) Lamhonwah-1986; Probe 1
[2] XmnI B1= 13.0/(0.61); B2= 9.5/(0.39) Bowcock-1989; Probe 1"

REF

MAG,POL "Bowcock &: CCG, 51, (HGM10), 966-967, 1989
HIS "Childs &: Pediatrics, 27, 522-538, 1961
PND,MGC "Gompertz &: Clin Genet, 8, 244-250, 1975
MOP "Kalousek &: JBC, 285, 60-65, 1980
EXP,PAT "Lamhonwah AM &: AJHG, 41, 1124-1131, 1987
PRO,SEQ,LOC,POL "Lamhonwah AM &: PNAS, 83, N13, 4864-4868, 1986
PHE "Steinman &: Dev Med Child Neurol, 25, 87-94, 1983
REV,MEB,PHE "Wolf &: AJHG, 34, 699-716, 1982

SWI

SWISSPROT: P05165

KEY

mtbd, mito, aac

CLA

coding, basic

LOC

13 q32

MIM

MIM: 232000

EZN

ENZYME: 6.4.1.3

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