Thiamine: Difference between revisions

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'''Thiamin''' or '''thiamine''', also known as '''[[vitamin]] B<sub>1</sub>''' and '''aneurine hydrochloride''', is the term for a family of molecules sharing a common structural feature responsible for its activity as a vitamin. It is one of the [[B vitamins]]. Its most common form is a colorless chemical [[chemical compound|compound]] with a [[chemical formula]] [[Carbon|C]]<sub>12</sub>[[Hydrogen|H]]<sub>17</sub>[[Nitrogen|N]]<sub>4</sub>[[Oxygen|O]][[Sulfur|S]]. This form of thiamin is [[soluble]] in [[water]], [[methanol]], and [[glycerol]] and practically insoluble in [[acetone]], [[ether]], [[chloroform]], and [[benzene]]. Another form of thiamin known as TTFD has different solubility properties and belongs to a family of molecules often referred to as fat-soluble thiamins. Thiamin decomposes if heated. Its chemical structure contains a [[pyrimidine]] ring and a [[thiazole]] ring.
 
ThiamineThiamin is one of only four nutrients associated with a pandemic human deficiency disease. It is essential for neural function and carbohydrate metabolism. Thiamin deficiency results in [[beriberi]], a disease characterized by a bewildering variety of [http://ecam.oxfordjournals.org/cgi/content/abstract/3/1/49?ijkey=UJiBzBnDXsxRKnp&keytype=ref symptoms]. Common symptoms often involve the nervous system and the heart. In less severe deficiency, nonspecific signs include malaise, weight loss, irritability and confusion.<ref> Combs,G. F. Jr. ''The vitamins: Fundamental Aspects in Nutrition and Health''. 3rd Edition. Ithaca, NY: Elsevier Academic Press; 2008; pg.266</ref>
 
== History ==
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===Diagnostic testing ===
A positive diagnosis test for thiamin deficiency can be ascertained by measuring the activity of the enzyme [[transketolase]] in [[erythrocyte]]s. ThiamineThiamin can also be seen directly in whole blood following the conversion of thiamin to a [[fluorescent]] thiochrome derivative. However, this test may not reveal the deficiency in diabetic patients.<ref name="Thornally"/><ref>[http://www2.warwick.ac.uk/newsandevents/pressreleases/researchers_find_vitamin/ Researchers find vitamin B1 deficiency key to vascular problems for diabetic patients], University of Warwick</ref>
 
==ThiamineThiamin phosphate derivatives==
There are four known natural thiamin phosphate derivatives: [[thiamin monophosphate]] (ThMP), [[thiamin diphosphate]] (ThDP) or [[thiamin pyrophosphate]] (TPP), [[thiamin triphosphate]] (ThTP), and the recently discovered [[adenosine thiamin triphosphate]] (AThTP).
 
====ThiamineThiamin pyrophosphate====
[[ThiamineThiamin pyrophosphate]] (TPP), also known as ''thiamin diphosphate'' (ThDP), and [[cocarboxylase]] is a [[coenzyme]] for several enzymes that catalyze the [[dehydrogenation]] ([[decarboxylation]] and subsequent conjugation to [[Coenzyme A]]) of alpha-keto acids. Examples include:
 
* In [[mammals]]:
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TPP is synthesized by the enzyme [[thiamin pyrophosphokinase]], which requires free thiamin, [[magnesium]], and [[adenosine triphosphate]].
 
====ThiamineThiamin triphosphate====
[[ThiamineThiamin triphosphate]] (ThTP) was long considered a specific neuroactive form of thiamin. However, recently it was shown that ThTP exists in [[bacteria]], [[fungi]], [[plants]] and [[animals]] suggesting a much more general cellular role. In particular in ''[[E. coli]]'' it seems to play a role in response to amino acid starvation.
 
====Adenosine thiamin triphosphate====
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{{Vitamin}}
 
[[Category:Amines|ThiamineThiamin]]
[[Category:Pyrimidines|ThiamineThiamin]]
[[Category:Thiazoles|ThiamineThiamin]]
[[Category:Vitamins]]
[[Category:Coenzymes]]