Lol, I did. I'll try to be simplier.Thanks If you're going to talk to me about that you really need to dumb it down. That's way beyond me on a good day, but I get the gist of what you are saying.
Lol, I did. I'll try to be simplier.
Bottom line. Stopping mast cells from exploding their content will help you to have less pain.
Issie
MAO uses FAD as a cofactor...DAO uses B6, B12 and copper and iron.DAO uses FAD as a cofactor
Sorry. Suzy is not using the current gene name for Amiloride-sensitive amine oxidase (also called (Diamine oxidase) so I looked up the wrong gene and failed to check my work. But B6 is still not a cofactor. I knew this because of biochemistry and B6 in any form cannot serve in oxidase reactions because electrons.
Here is the Diamine Oxidase gene:
http://www.uniprot.org/uniprot/P19801
It used to be called DAO1 but now it is called AOC1 and it can use copper, calcium, and topoquinone as cofactors.
I am being specific as to use of the term cofactor. AOC1 does not use B12, iron, or B6 as a cofactor.
I think we both learned a lesson: double check your work!
Very interesting. I looked all over the place to see why it is "commonly said" that B6 helps DAO and couldn't find anything.Taking B6 will increase AOCS1 activity only because it will make more histamine by stimulating histamine decarboxylase.
That is not the same as it being a cofactor and increasing the enzymatic activity.
http://www.uniprot.org/uniprot/P19113
B6 is the cofactor for HDC. So if you have histamine intolerance it will only make your allergies worse because it will increase its enzymatic activity and turn more histadine into histamine.
This is why you need to be careful interpriting the research.
And all I had to do was consult the Textbook of Medical Biochemistry, 8th edition.
Sorry you wasted your time, @RuthAnn, when it's so easy to find.
View attachment 1703
So let me see if I have this straight.
Is the B6-P a cofactor of DAO?
Or does it represent a coenzyme, histidine decarboxylase?
https://en.wikipedia.org/wiki/Histidine_decarboxylase
Refer to my earlier post. It's very clear where the B6 comes in.Well, I'll copy the stuff here and you can show me where the B6 comes in.
It's funny, because for a couple of years now I have seen that DAO is made up of copper and B6. As if it were a fact!
Entry
EC 1.4.3.22 EnzymeNamediamine oxidase;
amine oxidase (ambiguous);
amine oxidase (copper-containing) (ambiguous);
CAO (ambiguous);
Cu-containing amine oxidase (ambiguous);
copper amine oxidase (ambiguous);
diamine oxidase (ambiguous);
diamino oxhydrase (ambiguous);
histaminase;
histamine deaminase (incorrect);
semicarbazide-sensitive amine oxidase (incorrect);
SSAO (incorrect)
ClassOxidoreductases;
Acting on the CH-NH2 group of donors;
With oxygen as acceptor
Sysnamehistaminexygen oxidoreductase (deaminating)
Reaction(IUBMB)histamine + H2O + O2 = (imidazol-4-yl)acetaldehyde + NH3 + H2O2 [RN:R02150]
Reaction(KEGG)R02150;
(other) R01151 R02173 R03139 R04674 R06133
Substratehistamine [CPD:C00388];
H2O [CPD:C00001];
O2 [CPD:C00007]
Product(imidazol-4-yl)acetaldehyde;
NH3 [CPD:C00014];
H2O2 [CPD:C00027]
CommentA group of enzymes that oxidize diamines, such as histamine, and also some primary monoamines but have little or no activity towards secondary and tertiary amines. They are copper quinoproteins (2,4,5-trihydroxyphenylalanine quinone) and, like EC 1.4.3.21 (primary-amine oxidase) but unlike EC 1.4.3.4 (monoamine oxidase), they are sensitive to inhibition by carbonyl-group reagents, such as semicarbazide.
HistoryEC 1.4.3.22 created 2007 (EC 1.4.3.6 created 1961, part-incorporated 2008)
Pathway» show all
ec00330
Arginine and proline metabolism
ec00340
Histidine metabolism
ec00380
Tryptophan metabolism
ec01100
Metabolic pathways
Orthology
K11182
diamine oxidase
Genes
HSA:
26(AOC1)
PTR:
463895(AOC1)
PPS:
100973977(AOC1)
GGO:
101145709(ABP1)
PON:
100173768(AOC1)
NLE:
100598250(AOC1)
MCC:
714112(AOC1)
MCF:
102141942(AOC1)
RRO:
104675391(AOC1)
CJC:
100414302(AOC1)
Reference1
AuthorsZeller, E.A.
TitleDiamine oxidases.
JournalIn: Boyer, P.D., Lardy, H. and Myrback, K. (Eds.), The Enzymes, 2nd ed., vol. 8, Academic Press, New York, 1963, p. 313-335.
Reference2 [PMID:182134]
AuthorsCrabbe MJ, Waight RD, Bardsley WG, Barker RW, Kelly ID, Knowles PF.
TitleHuman placental diamine oxidase. Improved purification and characterization of a copper- and manganese-containing amine oxidase with novel substrate specificity.
JournalBiochem. J. 155 (1976) 679-87.
Reference3 [PMID:8182053]
AuthorsChassande O, Renard S, Barbry P, Lazdunski M.
TitleThe human gene for diamine oxidase, an amiloride binding protein. Molecular cloning, sequencing, and characterization of the promoter.
JournalJ. Biol. Chem. 269 (1994) 14484-9.
Sequence[hsa:26]
Reference4 [PMID:10668504]
AuthorsHouen G.
TitleMammalian Cu-containing amine oxidases (CAOs): new methods of analysis, structural relationships, and possible functions.
JournalAPMIS. Suppl. 96 (1999) 1-46.
Reference5 [PMID:12072962]
AuthorsElmore BO, Bollinger JA, Dooley DM.
TitleHuman kidney diamine oxidase: heterologous expression, purification, and characterization.
JournalJ. Biol. Inorg. Chem. 7 (2002) 565-79.
Other DBsExplorEnz - The Enzyme Database:
1.4.3.22
IUBMB Enzyme Nomenclature:
1.4.3.22
ExPASy - ENZYME nomenclature database:
1.4.3.22
BRENDA, the Enzyme Database:
1.4.3.22
All links
Pathway (8)
KEGG PATHWAY (8)
Chemical substance (16)
KEGG COMPOUND (16)
Chemical reaction (25)
KEGG REACTION (6)
KEGG RPAIR (18)
KEGG RCLASS (1)
Gene (142)
KEGG ORTHOLOGY (1)
KEGG GENES (96)
KEGG DGENES (10)
KEGG MGENES (21)
RefGene (5)
EGENES (9)
Protein sequence (57)
UniProt (31)
SWISS-PROT (6)
RefSeq(pep) (11)
PDBSTR (9)
DNA sequence (40)
RefSeq(nuc) (18)
GenBank (13)
EMBL (9)
3D Structure (5)
PDB (5)
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PubMed (4)
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Refer to my earlier post. It's very clear where the B6 comes in.
DAO isn't "made up" of B6. It uses it.
Anal Biochem. 1994 Jul;220(1):185-91.
Isolation and identification by gas chromatographic mass spectrometry of the carbonyl-active site of pig kidney diamine oxidase.
Buffoni F1.
Author information
Erratum in
Abstract
- Anal Biochem 1994 Nov 1;222(2):520.
An adduct with phenylhydrazine was formed with the purified pig kidney diamine oxidase and in parallel with the l-tyrosine decarboxylase from Streptococcus faecalis. The labeled enzymes were hydrolyzed by chemical hydrolysis and the adducts released by hydrolysis were isolated and identified first in HPLC and successively in GC-MS. Both enzymes gave the same adduct which was identified as the phenylhydrazone of pyridoxal. The isolated adduct had the same retention time as the phenylhydrazone of pyridoxal in HPLC and in gas chromatography and showed the same molecular weight in mass spectrometry when chemical ionization was used and the same fragmentation in mass spectrometry when electronic impact was used. The reported results show that pig kidney diamine oxidase contains pyridoxal in the form of covalently linked pyridoxal phosphate which can be released from the enzyme only by chemical hydrolysis. Pig kidney diamine oxidase is therefore a pyridoxal enzyme such as l-tyrosine decarboxylase as hypothesized in the past but never clearly demonstrated.
http://www.ncbi.nlm.nih.gov/pubmed/7246346
Agents Actions. 1981 Apr;11(1-2):28-32.
In vivo formation of histamine phosphopyridoxal cyclic compounds.
Kierska D, Sasiak K, Maśliński C.
Abstract
A possibility of in vivo formation of cyclic compounds between histamine (Hi) given i.p. and endogenous pyridoxal (PL) or pyridoxal 5'-phosphate (PLP) has been studied. Cyclic compounds of Hi with PL or PLP were found in all tissues examined. Although an increase in Hi levels in tissues enhances the formation of cyclic compounds, no simple relationship between the rate of formation and Hi concentration has been observed. The reaction seems to be limited by endogenous PLP. The cyclic products Hi-PL and Hi-PLP were discovered in urine. It is suggested that the process of cyclic compound formation may reduce PLP resources, resulting in a modification of PLP-enzyme activities.
http://www.ncbi.nlm.nih.gov/pubmed/102131
Agents Actions. 1978 Oct;8(5):470-3.
Phosphopyridoxal cyclic compounds with histamine and histidine. 6: The formation of phosphopyridoxal cyclic compounds with histamine and histidine in the presence of biological material.
Kierska D, Sasiak K, Maśliński C.
Abstract
We have studied the dynamics of cyclic compound formation between histamine or histidine and pyridoxal 5'-phosphate (Hi-PLP or His-PLP) in incubates of rat gastric mucosa histidine decarboxylase (HD), rat intestinal diamine oxidase (DAO) or homogenates of either rat liver, intestine or gastric mucosa. For gastric mucosa HD, liver and gastric mucosa homogenates, the rate of cyclization was slightly decreased; however, the rate was significantly inhibited with intestinal DAO or intestinal homogenate. Binding of PLP by tissue components was measured; free PLP was bound abundantly by rat intestinal DAO and by rat intestinal homogenate. A possible mechanism by which intestinal tissues inhibit cyclic compound formation is discussed.
http://www.ncbi.nlm.nih.gov/pubmed/3426767
Alcohol Alcohol. 1987;22(4):389-94.
Influence of pyridoxal 5'-phosphate on ethanol-induced changes in histamine catabolism in the guinea pig.
Kierska D1, Sasiak K, Maslinski C.
Author information
Abstract
In guinea pigs, chronic intragastric administration of a 20% ethanol solution for 18 days (in increasing doses from 5 to 10 g/kg/day) leads, on the 18th day, to an enhancement of histamine level in the liver and the small intestine by up to 170% and 180% respectively. In these tissues the rate of histamine oxidative catabolism was depressed by about 20%. Histamine N-methyltransferase activity, as well as the level of acetylhistamine were not affected. Pyridoxal 5'-phosphate (2 mg/animal/day) tended to normalize both histamine levels and the rate of histamine oxidative catabolism.
It's covalently linked to the diamine oxidase.
That linkage forms a cyclic compound.
http://www.ncbi.nlm.nih.gov/pubmed/7246346
Agents Actions. 1981 Apr;11(1-2):28-32.
In vivo formation of histamine phosphopyridoxal cyclic compounds.
Kierska D, Sasiak K, Maśliński C.
Abstract
A possibility of in vivo formation of cyclic compounds between histamine (Hi) given i.p. and endogenous pyridoxal (PL) or pyridoxal 5'-phosphate (PLP) has been studied. Cyclic compounds of Hi with PL or PLP were found in all tissues examined. Although an increase in Hi levels in tissues enhances the formation of cyclic compounds, no simple relationship between the rate of formation and Hi concentration has been observed. The reaction seems to be limited by endogenous PLP. The cyclic products Hi-PL and Hi-PLP were discovered in urine. It is suggested that the process of cyclic compound formation may reduce PLP resources, resulting in a modification of PLP-enzyme activities.
http://www.ncbi.nlm.nih.gov/pubmed/102131
Agents Actions. 1978 Oct;8(5):470-3.
Phosphopyridoxal cyclic compounds with histamine and histidine. 6: The formation of phosphopyridoxal cyclic compounds with histamine and histidine in the presence of biological material.
Kierska D, Sasiak K, Maśliński C.
Abstract
We have studied the dynamics of cyclic compound formation between histamine or histidine and pyridoxal 5'-phosphate (Hi-PLP or His-PLP) in incubates of rat gastric mucosa histidine decarboxylase (HD), rat intestinal diamine oxidase (DAO) or homogenates of either rat liver, intestine or gastric mucosa. For gastric mucosa HD, liver and gastric mucosa homogenates, the rate of cyclization was slightly decreased; however, the rate was significantly inhibited with intestinal DAO or intestinal homogenate. Binding of PLP by tissue components was measured; free PLP was bound abundantly by rat intestinal DAO and by rat intestinal homogenate. A possible mechanism by which intestinal tissues inhibit cyclic compound formation is discussed.
http://www.ncbi.nlm.nih.gov/pubmed/3426767
That linkage forms a cyclic compound.
And when you give B6, histamine levels are normalized because the enzymes are bunk without it.
Just like they described all along.
That linkage is a compound of histamine and a pyridoxal compound found in urine. What does that have to do with DAO or how does it prove that B6 is a cofactor of DAO?
First link. Pyridoxal enzyme means B6.That linkage is a compound of histamine and a pyridoxal compound found in urine. What does that have to do with DAO or how does it prove that B6 is a cofactor of DAO?