Lactate Dehydrogenase – Wikipedia
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8/13/2021 Lactate dehydrogenase - Wikipedia Lactate dehydrogenase Lactate dehydrogenase (LDH or LD) is an enzyme found in nearly all living cells. LDH catalyzes the conversion of lactate to pyruvate and Lactate dehydrogenase back, as it converts NAD+ to NADH and back. A dehydrogenase is an enzyme that transfers a hydride from one molecule to another. LDH exists in four distinct enzyme classes. This article is specifically about the NAD(P)-dependent L-lactate dehydrogenase. Other LDHs act on D-lactate and/or are dependent on cytochrome c: D-lactate dehydrogenase (cytochrome) and L-lactate dehydrogenase (cytochrome). LDH is expressed extensively in body tissues, such as blood cells and heart muscle. Because it is released during tissue damage, it is a marker of common injuries and disease such as heart failure. Lactate dehydrogenase M tetramer (LDH5), Human Identifiers Contents EC no. 1.1.1.27 (https://www.qmul.ac. Reaction uk/sbcs/iubmb/enzyme/EC1/1/ Active site 1/27.html) Isozymes CAS no. 9001-60-9 (http://www.commo nchemistry.org/ChemicalDetai Protein families l.aspx?ref=9001-60-9&title=) Interactive pathway map Databases Enzyme regulation IntEnz view (https://www.ebi.a Ethanol-induced hypoglycemia IntEnz c.uk/intenz/query?cmd=Searc Substrate regulation hEC&ec=1.1.1.27) Transcriptional regulation BRENDA BRENDA entry (http://www.br Genetics enda-enzymes.org/enzyme.ph Mutations p?ecno=1.1.1.27) Role in muscular fatigue ExPASy NiceZyme view (https://enzym Blood test e.expasy.org/EC/1.1.1.27) Testing in cancer KEGG KEGG entry (https://www.gen Hemolysis ome.jp/dbget-bin/www_bget?e Tissue turnover nzyme+1.1.1.27) HIV MetaCyc metabolic pathway (https://bio Testing in other body fluids cyc.org/META/substring-searc Exudates and transudates h?type=NIL&object=1.1.1.27) Meningitis and encephalitis PRIAM profile (http://priam.prabi.fr/cgi In cancer treatment -bin/PRIAM_profiles_CurrentR Prokaryotes elease.pl?EC=1.1.1.27) See also PDB RCSB PDB (https://www.rcsb. structures org/search?q=rcsb_polymer_e References ntity.rcsb_ec_lineage.id:1.1.1. Further reading 27) PDBe (https://www.ebi.ac. https://en.wikipedia.org/wiki/Lactate_dehydrogenase 1/14 8/13/2021 Lactate dehydrogenase - Wikipedia External links uk/pdbe/entry/search/index?e c_number:1.1.1.27) PDBsum (https://www.ebi.ac.uk/thornto Reaction n-srv/databases/cgi-bin/enzym es/GetPage.pl?ec_number=1. Lactate dehydrogenase catalyzes the interconversion of pyruvate and 1.1.27) lactate with concomitant interconversion of NADH and NAD+. It Gene AmiGO (http://amigo.geneonto converts pyruvate, the final product of glycolysis, to lactate when oxygen is absent or in short supply, and it performs the reverse Ontology logy.org/amigo/term/GO:0004 reaction during the Cori cycle in the liver. At high concentrations of 459) / QuickGO (https://www.e lactate, the enzyme exhibits feedback inhibition, and the rate of bi.ac.uk/QuickGO/term/GO:00 conversion of pyruvate to lactate is decreased. It also catalyzes the 04459) dehydrogenation of 2-hydroxybutyrate, but this is a much poorer Search substrate than lactate. PMC articles (https://www.ncbi.nlm. nih.gov/entrez/query.fcgi?db=p Active site ubmed&term=1.1.1.27%5BE C/RN%20Number%5D%20AN LDH in humans uses His(193) as the proton acceptor, and works in D%20pubmed%20pmc%20loc unison with the coenzyme (Arg99 and Asn138), and substrate (Arg106; al%5Bsb%5D) Arg169; Thr248) binding residues.[1][2] The His(193) active site, is not PubMed articles (https://www.ncbi.nlm. only found in the human form of LDH, but is found in many different nih.gov/entrez/query.fcgi?db=p animals, showing the convergent evolution of LDH. The two different ubmed&term=1.1.1.27%5BE subunits of LDH (LDHA, also known as the M subunit of LDH, and C/RN%20Number%5D) LDHB, also known as the H subunit of LDH) both retain the same NCBI proteins (https://www.ncbi.nlm. active site and the same amino acids participating in the reaction. The nih.gov/protein?term=1.1.1.2 noticeable difference between the two subunits that make up LDH's 7%5BEC/RN%20Number%5 tertiary structure is the replacement of alanine (in the M chain) with a D) glutamine (in the H chain). This tiny but notable change is believed to be the reason the H subunit can bind NAD faster, and the M subunit's catalytic activity isn't reduced in the presence of acetylpyridine adenine dinucleotide, whereas the H subunit's activity is reduced fivefold.[3] Isozymes Reaction catalyzed by lactate dehydrogenase Lactate dehydrogenase is composed of four subunits (tetramer). The two most common subunits are the LDH-M and LDH-H protein, encoded by the LDHA and LDHB genes, respectively. These two subunits can form five possible tetramers (isoenzymes): 4H, 4M, and the three mixed tetramers (3H1M, 2H2M, 1H3M). These five isoforms are enzymatically similar but show different tissue distribution: The major isoenzymes of skeletal muscle and liver, M4, has four muscle (M) subunits, while H4 is the main isoenzymes for heart muscle in most species, containing four heart (H) subunits. LDH-1 (4H)—in the heart and in RBC (red blood cells), as well as the brain[4] Arrow pushing mechanism for the reaction catalyzed by lactate LDH-2 (3H1M)—in the reticuloendothelial dehydrogenase system LDH-3 (2H2M)—in the lungs LDH-4 (1H3M)—in the kidneys, placenta, and pancreas https://en.wikipedia.org/wiki/Lactate_dehydrogenase 2/14 8/13/2021 Lactate dehydrogenase - Wikipedia LDH-5 (4M)—in the liver and striated muscle,[5] also present in the brain[4] LDH-2 is usually the predominant form in the serum. An LDH-1 level higher than the LDH-2 level (a "flipped pattern") suggests myocardial infarction (damage to heart tissues releases heart LDH, which is rich in LDH-1, into the bloodstream). The use of this phenomenon to diagnose infarction has been largely superseded by the use of Troponin I or T measurement. There are two more mammalian LDH subunits that can be included in LDH tetramers: LDHC and LDHBx. LDHC is a testes-specific LDH protein, that is encoded by the LDHC gene. LDHBx is a peroxisome-specific LDH protein. LDHBx is the readthrough-form of LDHB. LDHBx is generated by translation of the LDHB mRNA, but the stop codon is interpreted as an amino acid-encoding codon. In consequence, translation continues to the next stop codon. This leads to the addition of seven amino acid residues to the normal LDH-H protein. The extension contains a peroxisomal targeting signal, so that LDHBx is imported into the peroxisome.[6] lactate dehydrogenase A lactate dehydrogenase B lactate dehydrogenase C (subunit M) (subunit H) Crystal structure of Mouse Testicular Crystal structure of B-lactate Lactate dehydrogenase (C4). From dehydrogenase. From PDB: 1T2F (htt PDB: 2LDX (https://www.rcsb.org/stru Human lactate dehydrogenase M4 (the isoenzyme found in skeletal ps://www.rcsb.org/structure/1T2F). cture/2LDX) . muscle). From PDB: 1I10 (https://ww Identifiers Identifiers w.rcsb.org/structure/1I10) . Symbol LDHB Symbol LDHC Identifiers Alt. LDHL NCBI 3948 (https://www.ncbi.nlm. Symbol LDHA symbols gene nih.gov/gene?cmd=retrieve Alt. LDHM NCBI 3945 (https://www.ncbi.nl &dopt=default&list_uids=39 symbols gene m.nih.gov/gene?cmd=retrie 48&rn=1) NCBI 3939 (https://www.ncbi.nl ve&dopt=default&list_uids= HGNC 6544 (https://www.genenam gene m.nih.gov/gene?cmd=retrie 3945&rn=1) es.org/data/gene-symbol-re ve&dopt=default&list_uids= HGNC 6541 (https://www.genena port/#!/hgnc_id/HGNC:654 3939&rn=1) mes.org/data/gene-symbol- 4) HGNC 6535 (https://www.genena report/#!/hgnc_id/HGNC:65 OMIM 150150 (https://omim.org/15 mes.org/data/gene-symbol- 41) 0150) report/#!/hgnc_id/HGNC:65 OMIM 150100 (https://omim.org/1 RefSeq NM_002301 (https://genom 35) 50100) e.ucsc.edu/cgi-bin/hgTrack OMIM 150000 (https://omim.org/1 RefSeq NM_002300 (https://genom s?Submit=Submit&position= 50000) e.ucsc.edu/cgi-bin/hgTrack NM_002301&rn=1) RefSeq NM_005566 (https://genom s?Submit=Submit&position UniProt P07864 (https://www.unipro e.ucsc.edu/cgi-bin/hgTrack =NM_002300&rn=1) t.org/uniprot/P07864) s?Submit=Submit&position UniProt P07195 (https://www.unipr Other data =NM_005566&rn=1) ot.org/uniprot/P07195) EC 1.1.1.27 (https://www.geno UniProt P00338 (https://www.unipr Other data number me.jp/dbget-bin/www_bget? ot.org/uniprot/P00338) EC 1.1.1.27 (https://www.geno enzyme+1.1.1.27) https://en.wikipedia.org/wiki/Lactate_dehydrogenase 3/14 8/13/2021 Lactate dehydrogenase - Wikipedia Other data number me.jp/dbget-bin/www_bge Locus Chr. 11 p15.5–15.3 (https://o EC 1.1.1.27 (https://www.geno t?enzyme+1.1.1.27) mim.org/search/?index=gen number me.jp/dbget-bin/www_bge Locus Chr. 12 p12.2–12.1 (https:// eMap&search=11p15.5–15. t?enzyme+1.1.1.27) omim.org/search/?index=g 3) Locus Chr. 11 p15.4 (https://omi eneMap&search=12p12.2– Search for m.org/search/?index=gene 12.1) Structures Swiss-model (https://swissm Map&search=11p15.4) Search for odel.expasy.org/repository/u niprot/P07864) Search for Structures Swiss-model (https://swissm odel.expasy.org/repository/u Domains InterPro (https://www.ebi.ac. Structures Swiss-model (https://swissm niprot/P07195) uk/interpro/protein/P07864) odel.expasy.org/repository/u niprot/P00338) Domains InterPro (https://www.ebi.ac. uk/interpro/protein/P07195) Domains InterPro (https://www.ebi.ac. uk/interpro/protein/P00338) Protein families D-lactate dehydrogenase, lactate/malate lactate/malate membrane binding dehydrogenase, NAD dehydrogenase, alpha/beta binding domain C-terminal domain Identifiers Identifiers Symbol Ldh_1_N Symbol Ldh_1_C Pfam PF00056 (http://pfam.xfam.