Adenosine kinase: Difference between revisions

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{{Short description|An enzyme involved in the metabolism of adenosine}}
{{DISPLAYTITLE:Adenosine kinase}}
{{Use dmy dates|date=October 2023}}


'''Adenosine kinase''' is an [[enzyme]] that plays a crucial role in the [[metabolism]] of [[adenosine]], a nucleoside that is involved in various physiological processes. This enzyme is responsible for the phosphorylation of adenosine to form [[adenosine monophosphate]] (AMP), a key step in the [[salvage pathway]] of [[adenine nucleotides]].
== Adenosine kinase ==


==Structure==
[[File:4o1g.jpg|thumb|right|Crystal structure of adenosine kinase]]
Adenosine kinase is a [[protein]] that is encoded by the [[ADK gene]] in humans. The enzyme is composed of a single polypeptide chain and has a molecular weight of approximately 40 kDa. The structure of adenosine kinase has been elucidated through [[X-ray crystallography]], revealing a complex fold that is typical of [[nucleotide-binding proteins]]. The active site of the enzyme is located in a cleft between two domains, where adenosine and [[ATP]] bind during the catalytic process.


==Function==
'''Adenosine kinase''' is an enzyme that plays a crucial role in the metabolism of [[adenosine]] and the regulation of its concentration within cells. It catalyzes the transfer of a phosphate group from [[adenosine triphosphate|ATP]] to adenosine, forming [[adenosine monophosphate|AMP]]. This reaction is important for maintaining the balance of adenosine levels, which is critical for various physiological processes.
The primary function of adenosine kinase is to catalyze the transfer of a [[phosphate group]] from ATP to adenosine, forming AMP. This reaction is crucial for maintaining the balance of adenosine levels within the cell. Adenosine itself is a signaling molecule that can influence various physiological processes, including [[vasodilation]], [[neurotransmission]], and [[immune response]]. By converting adenosine to AMP, adenosine kinase regulates the availability of adenosine for these processes.


==Regulation==
== Function ==
Adenosine kinase activity is regulated by several factors, including the availability of its substrates, adenosine and ATP. The enzyme is also subject to feedback inhibition by its product, AMP. Additionally, adenosine kinase expression and activity can be modulated by various physiological and pathological conditions, such as [[hypoxia]], [[inflammation]], and [[cancer]].


==Clinical significance==
Adenosine kinase is responsible for the phosphorylation of adenosine, a key step in the [[purine metabolism]] pathway. By converting adenosine to AMP, adenosine kinase helps regulate the availability of adenosine for other cellular functions, such as acting as a [[neurotransmitter]] and modulating [[inflammation]].
Alterations in adenosine kinase activity have been implicated in several diseases. For example, reduced activity of adenosine kinase can lead to elevated levels of adenosine, which may contribute to the pathophysiology of [[epilepsy]], [[chronic pain]], and [[inflammatory disorders]]. Conversely, increased activity of the enzyme can decrease adenosine levels, potentially affecting [[cardiovascular]] and [[neurological]] functions.


==Research==
== Structure ==
Adenosine kinase is a target of interest in drug development, particularly for conditions where modulation of adenosine levels could be therapeutic. Inhibitors of adenosine kinase are being explored for their potential to increase adenosine levels and provide benefits in conditions such as [[stroke]], [[myocardial infarction]], and [[neurodegenerative diseases]].
 
The enzyme adenosine kinase is a monomeric protein that has been crystallized and studied extensively. The crystal structure, as shown in the image, reveals a complex folding pattern that is typical of kinases. The active site of adenosine kinase is highly conserved and is responsible for binding both adenosine and ATP during the catalytic process.
 
== Clinical significance ==
 
Adenosine kinase has been implicated in various medical conditions due to its role in regulating adenosine levels. Abnormal activity of this enzyme can lead to disorders such as [[epilepsy]], [[ischemia]], and [[chronic pain]]. Inhibitors of adenosine kinase are being explored as potential therapeutic agents for these conditions, as they can increase adenosine levels and exert protective effects.
 
== Related pages ==


==Related pages==
* [[Adenosine triphosphate]]
* [[Adenosine triphosphate]]
* [[Nucleotide metabolism]]
* [[Adenosine monophosphate]]
* [[Enzyme kinetics]]
* [[Purine metabolism]]
* [[Signal transduction]]
* [[Neurotransmitter]]
 
==Gallery==
<gallery>
File:4o1g.jpg|Crystal structure of adenosine kinase
</gallery>


[[Category:Enzymes]]
[[Category:Enzymes]]
[[Category:Metabolism]]
[[Category:Metabolism]]
[[Category:Signal transduction]]

Latest revision as of 03:50, 13 February 2025


Adenosine kinase[edit]

Crystal structure of adenosine kinase

Adenosine kinase is an enzyme that plays a crucial role in the metabolism of adenosine and the regulation of its concentration within cells. It catalyzes the transfer of a phosphate group from ATP to adenosine, forming AMP. This reaction is important for maintaining the balance of adenosine levels, which is critical for various physiological processes.

Function[edit]

Adenosine kinase is responsible for the phosphorylation of adenosine, a key step in the purine metabolism pathway. By converting adenosine to AMP, adenosine kinase helps regulate the availability of adenosine for other cellular functions, such as acting as a neurotransmitter and modulating inflammation.

Structure[edit]

The enzyme adenosine kinase is a monomeric protein that has been crystallized and studied extensively. The crystal structure, as shown in the image, reveals a complex folding pattern that is typical of kinases. The active site of adenosine kinase is highly conserved and is responsible for binding both adenosine and ATP during the catalytic process.

Clinical significance[edit]

Adenosine kinase has been implicated in various medical conditions due to its role in regulating adenosine levels. Abnormal activity of this enzyme can lead to disorders such as epilepsy, ischemia, and chronic pain. Inhibitors of adenosine kinase are being explored as potential therapeutic agents for these conditions, as they can increase adenosine levels and exert protective effects.

Related pages[edit]