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{{enzyme
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In [[enzymology]], a '''glycine dehydrogenase (decarboxylating)''' ({{EC number|1.4.4.2}}) is an [[enzyme]] that [[catalysis|catalyzes]] the [[chemical reaction]]
'''Glycine dehydrogenase [decarboxylating], mitochondrial''' also known as '''glycine cleavage system P protein''' or '''glycine decarboxylase''' is an [[enzyme]] that in humans is encoded by the ''GLDC'' [[gene]].<ref name="pmid1993704">{{cite journal | author = Kume A, Koyata H, Sakakibara T, Ishiguro Y, Kure S, Hiraga K | title = The glycine cleavage system. Molecular cloning of the chicken and human glycine decarboxylase cDNAs and some characteristics involved in the deduced protein structures | journal = J Biol Chem | volume = 266 | issue = 5 | pages = 3323–9 | year = 1991 | month = Mar | pmid = 1993704 | pmc = | doi = }}</ref><ref name="pmid1996985">{{cite journal | author = Kure S, Narisawa K, Tada K | title = Structural and expression analyses of normal and mutant mRNA encoding glycine decarboxylase: three-base deletion in mRNA causes nonketotic hyperglycinemia | journal = Biochem Biophys Res Commun | volume = 174 | issue = 3 | pages = 1176–82 | year = 1991 | month = Mar | pmid = 1996985 | pmc = | doi =10.1016/0006-291X(91)91545-N }}</ref><ref name="entrez">{{cite web | title = Entrez Gene: GLDC glycine dehydrogenase (decarboxylating)| url = http://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=2731| accessdate = }}</ref>

== Reaction ==

Glycine dehydrogenase (decarboxylating) ({{EC number|1.4.4.2}}) is an [[enzyme]] that [[catalysis|catalyzes]] the following [[chemical reaction]]:


:glycine + H-protein-lipoyllysine <math>\rightleftharpoons</math> H-protein-S-aminomethyldihydrolipoyllysine + CO<sub>2</sub>
:glycine + H-protein-lipoyllysine <math>\rightleftharpoons</math> H-protein-S-aminomethyldihydrolipoyllysine + CO<sub>2</sub>
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Thus, the two [[substrate (biochemistry)|substrates]] of this enzyme are [[glycine]] and [[H-protein-lipoyllysine]], whereas its two [[product (chemistry)|products]] are [[H-protein-S-aminomethyldihydrolipoyllysine]] and [[carbon dioxide|CO<sub>2</sub>]].
Thus, the two [[substrate (biochemistry)|substrates]] of this enzyme are [[glycine]] and [[H-protein-lipoyllysine]], whereas its two [[product (chemistry)|products]] are [[H-protein-S-aminomethyldihydrolipoyllysine]] and [[carbon dioxide|CO<sub>2</sub>]].


This enzyme belongs to the family of [[oxidoreductase]]s, specifically those acting on the CH-NH2 group of donors with a disulfide as acceptor. The systematic name of this enzyme class is '''glycine:H-protein-lipoyllysine oxidoreductase (decarboxylating, acceptor-amino-methylating)'''. Other names in common use include '''P-protein''', '''glycine decarboxylase''', '''glycine-cleavage complex''', '''glycine:lipoylprotein oxidoreductase (decarboxylating and''', '''acceptor-aminomethylating)''', and '''protein P1'''. This enzyme participates in [[glycine, serine and threonine metabolism]]. It employs one [[cofactor (biochemistry)|cofactor]], [[pyridoxal phosphate]].
This enzyme belongs to the family of [[oxidoreductase]]s, 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 (biochemistry)|cofactor]], [[pyridoxal phosphate]].


==Structural studies==
== 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.
As of late 2007, 5 [[tertiary structure|structures]] have been solved for this class of enzymes, with [[Protein Data Bank|PDB]] accession codes {{PDB link|1HPC}}, {{PDB link|1HTP}}, {{PDB link|1WYT}}, {{PDB link|1WYU}}, and {{PDB link|1WYV}}.

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).<ref name="entrez"/>

== Clinical significance ==

[[D-Glyceric acidemia|Glycine encephalopathy]] may be due to a defect in any one of these enzymes.<ref name="entrez">{{cite web | title = Entrez Gene: GLDC glycine dehydrogenase (decarboxylating)| url = http://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=2731| accessdate = }}</ref>


==References==
==References==
{{reflist|1}}
{{reflist}}

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


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Revision as of 19:50, 20 October 2010

Template:Fix bunching Template:PBB Template:Fix bunching

glycine dehydrogenase (decarboxylating)
Identifiers
EC no.1.4.4.2
CAS no.37259-67-9
Databases
IntEnzIntEnz view
BRENDABRENDA entry
ExPASyNiceZyme view
KEGGKEGG entry
MetaCycmetabolic pathway
PRIAMprofile
PDB structuresRCSB PDB PDBe PDBsum
Gene OntologyAmiGO / QuickGO
Search
PMCarticles
PubMedarticles
NCBIproteins

Template:Fix bunching Glycine dehydrogenase [decarboxylating], mitochondrial also known as glycine cleavage system P protein or glycine decarboxylase is an enzyme that in humans is encoded by the GLDC gene.[1][2][3]

Reaction

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

glycine + H-protein-lipoyllysine 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 (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. {{cite journal}}: Unknown parameter |month= ignored (help)CS1 maint: multiple names: authors list (link)
  2. ^ Kure S, Narisawa K, Tada K (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. {{cite journal}}: Unknown parameter |month= ignored (help)CS1 maint: multiple names: authors list (link)
  3. ^ a b c "Entrez Gene: GLDC glycine dehydrogenase (decarboxylating)".

Further reading

}}