Glycine dehydrogenase (decarboxylating)

Glycine dehydrogenase (decarboxylating)
Identifiers
Symbols	GLDC ; GCE; GCSP; HYGN1
External IDs	OMIM: 238300 MGI: 1341155 HomoloGene: 141 GeneCards: GLDC Gene
EC number	1.4.4.2
Gene ontology Molecular function • glycine dehydrogenase (decarboxylating) activity • electron carrier activity • glycine binding • lyase activity Cellular component • mitochondrion • cytosol • glycine cleavage complex Biological process • glycine catabolic process • glycine decarboxylation via glycine cleavage system • oxidation-reduction process Sources: Amigo / QuickGO
RNA expression pattern
More reference expression data
Orthologs
Species	Human	Mouse
Entrez	2731	104174
Ensembl	ENSG00000178445	ENSMUSG00000024827
UniProt	P23378	Q91W43
RefSeq (mRNA)	NM_000170	NM_138595
RefSeq (protein)	NP_000161	NP_613061
Location (UCSC)	Chr 9: 6.53 – 6.65 Mb	Chr 19: 30.1 – 30.18 Mb
PubMed search

glycine decarboxylase
Identifiers
EC number	1.4.4.2
CAS number	37259-67-9
Databases
IntEnz	IntEnz view
BRENDA	BRENDA entry
ExPASy	NiceZyme view
KEGG	KEGG entry
MetaCyc	metabolic pathway
PRIAM	profile
PDB structures	RCSB PDB PDBe PDBsum
Gene Ontology	AmiGO / EGO
Search PMC articles PubMed articles NCBI proteins

Glycine decarboxylase also known as glycine cleavage system P protein or glycine dehydrogenase is an enzyme that in humans is encoded by the GLDC gene.^[1][2][3]

Reaction

Glycine decarboxylase (EC 1.4.4.2) is an enzyme that catalyzes the following chemical reaction:

glycine + H-protein-lipoyllysine $\rightleftharpoons$ H-protein-S-aminomethyldihydrolipoyllysine + CO₂

Thus, the two substrates of this enzyme are glycine and H-protein-lipoyllysine, whereas its two products are H-protein-S-aminomethyldihydrolipoyllysine and CO₂.

This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-NH2 group of donors with a disulfide as acceptor. This enzyme participates in glycine, serine and threonine metabolism. It employs one cofactor, pyridoxal phosphate.

Function

Glycine decarboxylase is a P-protein of the glycine cleavage system in eukaryotes. The glycine cleavage system catalyzes the degradation of glycine. The P protein binds the alpha-amino group of glycine through its pyridoxal phosphate cofactor. Carbon dioxide is released and the remaining methylamine moiety is then transferred to the lipoamide cofactor of the H protein.

Degradation of glycine is brought about by the glycine cleavage system, which is composed of four mitochondrial protein components: P protein (a pyridoxal phosphate-dependent glycine decarboxylase), H protein (a lipoic acid-containing protein), T protein (a tetrahydrofolate-requiring enzyme), and L protein (a lipoamide dehydrogenase).^[3]

Clinical significance

Glycine encephalopathy may be due to a defect in any one of these enzymes.^[3]

References

1. Kume A, Koyata H, Sakakibara T, Ishiguro Y, Kure S, Hiraga K (Mar 1991). "The glycine cleavage system. Molecular cloning of the chicken and human glycine decarboxylase cDNAs and some characteristics involved in the deduced protein structures". J Biol Chem 266 (5): 3323–9. PMID 1993704.
2. Kure S, Narisawa K, Tada K (Mar 1991). "Structural and expression analyses of normal and mutant mRNA encoding glycine decarboxylase: three-base deletion in mRNA causes nonketotic hyperglycinemia". Biochem Biophys Res Commun 174 (3): 1176–82. doi:10.1016/0006-291X(91)91545-N. PMID 1996985.
3. "Entrez Gene: GLDC glycine dehydrogenase (decarboxylating)".

Further reading

• Hiraga K, Kikuchi G (1980). "The mitochondrial glycine cleavage system. Functional association of glycine decarboxylase and aminomethyl carrier protein". J. Biol. Chem. 255 (24): 11671–6. PMID 7440563.
• Perham RN (2000). "Swinging arms and swinging domains in multifunctional enzymes: catalytic machines for multistep reactions". Annu. Rev. Biochem. 69: 961–1004. doi:10.1146/annurev.biochem.69.1.961. PMID 10966480.
• Broadwater JA, Haas JA, Fox BG, Booker SJ (2005). "Expression, purification, and physical characterization of Escherichia coli lipoyl(octanoyl)transferase". Protein. Expr. Purif. 39 (2): 269–82. doi:10.1016/j.pep.2004.10.021. PMID 15642479.*Applegarth DA, Toone JR (2001). "Nonketotic hyperglycinemia (glycine encephalopathy): laboratory diagnosis". Mol. Genet. Metab. 74 (1–2): 139–46. doi:10.1006/mgme.2001.3224. PMID 11592811.
• Kure S, Takayanagi M, Narisawa K, et al. (1992). "Identification of a common mutation in Finnish patients with nonketotic hyperglycinemia". J. Clin. Invest. 90 (1): 160–4. doi:10.1172/JCI115831. PMC 443076. PMID 1634607.
• Sakakibara T, Koyata H, Ishiguro Y, et al. (1991). "One of the two genomic copies of the glycine decarboxylase cDNA has been deleted at a 5' region in a patient with nonketotic hyperglycinemia". Biochem. Biophys. Res. Commun. 173 (3): 801–6. doi:10.1016/S0006-291X(05)80858-7. PMID 2268343.
• Burton BK, Pettenati MJ, Block SM, et al. (1989). "Nonketotic hyperglycinemia in a patient with the 9p- syndrome". Am. J. Med. Genet. 32 (4): 504–5. doi:10.1002/ajmg.1320320416. PMID 2773994.
• Hayasaka K, Kochi H, Hiraga K, Kikuchi G (1981). "Purification and properties of glycine decarboxylase, a component of the glycine cleavage system, from rat liver mitochondria and immunochemical comparison of this enzyme from various sources". J. Biochem. 88 (4): 1193–9. PMID 6778858.
• Hiraga K, Kochi H, Hayasaka K, et al. (1981). "Defective glycine cleavage system in nonketotic hyperglycinemia. Occurrence of a less active glycine decarboxylase and an abnormal aminomethyl carrier protein". J. Clin. Invest. 68 (2): 525–34. doi:10.1172/JCI110284. PMC 370827. PMID 6790577.
• Takayanagi M, Kure S, Sakata Y, et al. (2000). "Human glycine decarboxylase gene (GLDC) and its highly conserved processed pseudogene (psiGLDC): their structure and expression, and the identification of a large deletion in a family with nonketotic hyperglycinemia". Hum. Genet. 106 (3): 298–305. doi:10.1007/s004390051041. PMID 10798358.
• Toone JR, Applegarth DA, Coulter-Mackie MB, James ER (2000). "Biochemical and molecular investigations of patients with nonketotic hyperglycinemia". Mol. Genet. Metab. 70 (2): 116–21. doi:10.1006/mgme.2000.3000. PMID 10873393.
• Toone JR, Applegarth DA, Coulter-Mackie MB, James ER (2001). "Recurrent mutations in P- and T-proteins of the glycine cleavage complex and a novel T-protein mutation (N145I): a strategy for the molecular investigation of patients with nonketotic hyperglycinemia (NKH)". Mol. Genet. Metab. 72 (4): 322–5. doi:10.1006/mgme.2001.3158. PMID 11286506.
• Kure S, Kojima K, Ichinohe A, et al. (2002). "Heterozygous GLDC and GCSH gene mutations in transient neonatal hyperglycinemia". Ann. Neurol. 52 (5): 643–6. doi:10.1002/ana.10367. PMID 12402263.
• Strausberg RL, Feingold EA, Grouse LH, et al. (2003). "Generation and initial analysis of more than 15,000 full-length human and mouse cDNA sequences". Proc. Natl. Acad. Sci. U.S.A. 99 (26): 16899–903. doi:10.1073/pnas.242603899. PMC 139241. PMID 12477932.
• Toone JR, Applegarth DA, Laliberte G (2003). "Gene Symbol: GLDC. Disease: NKH glycine encephalopathy". Hum. Genet. 113 (5): 465. doi:10.1007/s00439-003-1014-5. PMID 14552331.
• Dinopoulos A, Kure S, Chuck G, et al. (2006). "Glycine decarboxylase mutations: a distinctive phenotype of nonketotic hyperglycinemia in adults". Neurology 64 (7): 1255–7. doi:10.1212/01.WNL.0000156800.23776.40. PMID 15824356.
• Flusser H, Korman SH, Sato K, et al. (2006). "Mild glycine encephalopathy (NKH) in a large kindred due to a silent exonic GLDC splice mutation". Neurology 64 (8): 1426–30. doi:10.1212/01.WNL.0000158475.12907.D6. PMID 15851735.
• Boneh A, Korman SH, Sato K, et al. (2005). "A single nucleotide substitution that abolishes the initiator methionine codon of the GLDC gene is prevalent among patients with glycine encephalopathy in Jerusalem". J. Hum. Genet. 50 (5): 230–4. doi:10.1007/s10038-005-0243-y. PMID 15864413.
• Kimura K, Wakamatsu A, Suzuki Y, et al. (2006). "Diversification of transcriptional modulation: large-scale identification and characterization of putative alternative promoters of human genes". Genome Res. 16 (1): 55–65. doi:10.1101/gr.4039406. PMC 1356129. PMID 16344560.
• Korman SH, Wexler ID, Gutman A, et al. (2006). "Treatment from birth of nonketotic hyperglycinemia due to a novel GLDC mutation". Ann. Neurol. 59 (2): 411–5. doi:10.1002/ana.20759. PMID 16404748.