Disulfide - Revision history

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	~~{{Short description\|Overview of disulfide bonds in biochemistry}}~~		= Disulfide =

	~~==Disulfide Bonds==~~		[[File:Cystine-from-xtal-Mercury-3D-balls-thin.png\|thumb\|right\|3D structure of cystine, a common disulfide.]]
	[[File:~~Disulfide~~-~~bond~~.png\|thumb\|right\|~~200px\|Diagram~~ of a disulfide ~~bond between two cysteine residues~~.]]
	A '''disulfide bond''' (also known as an '''S-S bond''' or '''disulfide bridge''') is a covalent bond derived from two thiol groups. In biochemistry, disulfide bonds are crucial for the stabilization of the tertiary and quaternary structures of proteins.

	~~==Formation~~ and ~~Structure==~~		A '''disulfide''' is a functional group with the structure R-S-S-R', where R and R' are organic groups. The linkage is also called a '''disulfide bridge''' or '''disulfide bond'''. Disulfides are important in the structure and function of many proteins and enzymes.
	~~Disulfide bonds~~ are ~~formed by the oxidation of two [[cysteine]] residues, resulting~~ in the ~~linkage~~ of ~~their sulfur atoms~~. ~~This reaction can be represented as:~~

	~~: 2 R-SH _ R-S-S-R + 2 H_ + 2 e_~~		== Structure and Properties ==

	~~where R-SH represents a~~ thiol ~~group~~. ~~The resulting~~ bond is ~~a covalent linkage between~~ the ~~sulfur atoms~~ of ~~two cysteine residues, forming a cystine~~.		Disulfide bonds are formed by the oxidation of two [[thiol]] groups, resulting in the linkage of two sulfur atoms. This bond is relatively stable and can significantly influence the tertiary and quaternary structure of proteins.

	~~==Role in Protein Structure==~~		[[File:Disulfide_Bridges_(SCHEMATIC)_V.1.svg\|thumb\|left\|Schematic representation of disulfide bridges in proteins.]]
	[[File:~~Protein-disulfide-bond~~.~~png~~\|thumb\|left\|~~200px\|Disulfide bonds help stabilize protein structures.]]~~
	~~Disulfide bonds play a critical role in the folding and stability~~ of ~~proteins. They are often found~~ in extracellular proteins and secreted proteins, where they help maintain structural integrity under varying environmental conditions. The presence of disulfide bonds can significantly increase the thermal and chemical stability of proteins.

	~~==Biological Significance==~~		The disulfide bond is a covalent bond, and its formation is a reversible process. The bond can be broken by reduction, converting the disulfide back to two thiol groups.
	~~Disulfide bonds are essential in the~~ formation ~~of the active conformation of many proteins~~. ~~For example~~, ~~they are crucial in~~ the ~~structure of antibodies, insulin, and many enzymes. In antibodies,~~ disulfide ~~bonds link the heavy and light chains, stabilizing the overall structure~~.

	==~~Disulfide Bond Formation~~==		== Biological Significance ==
	The formation of disulfide bonds in proteins occurs in the [[endoplasmic reticulum]] of eukaryotic cells. This process is facilitated by protein disulfide isomerase (PDI), which catalyzes the formation and rearrangement of disulfide bonds.

	~~==Reduction and Rearrangement==~~		Disulfide bonds play a crucial role in the folding and stability of proteins. They are often found in extracellular proteins, where they help maintain the protein's structure in the oxidizing environment outside the cell.
	Disulfide bonds ~~can be reduced back to thiol groups by reducing agents such as [[dithiothreitol]] (DTT) or [[_-mercaptoethanol]]~~. ~~This reduction is~~ often ~~used~~ in ~~laboratory settings to denature~~ proteins ~~for analysis by [[SDS-PAGE]]~~.

	==~~Applications in Biotechnology~~==		=== Cystine ===
	Disulfide bonds are exploited in biotechnology for the design of stable protein therapeutics and in the engineering of proteins with enhanced stability. They are also used in the development of biosensors and other diagnostic tools.

	==Related Pages==		[[File:Cystine-skeletal.png\|thumb\|right\|Skeletal structure of cystine.]]

			Cystine is a dimeric amino acid formed by the oxidation of two [[cysteine]] molecules, linked by a disulfide bond. It is a key structural component in many proteins, including [[keratin]] and [[insulin]].

			=== Lipoic Acid ===

			[[File:Lipoic-acid-from-xtal-3D-bs-17.png\|thumb\|left\|3D structure of lipoic acid.]]

			Lipoic acid is a cofactor for enzymatic reactions and contains a disulfide bond that is essential for its biological activity. It plays a role in the [[pyruvate dehydrogenase complex]] and other [[dehydrogenase]] complexes.

			== Chemical Reactions ==

			Disulfides can undergo various chemical reactions, including reduction to thiols and exchange reactions with other thiols.

			=== Thiol-Disulfide Exchange ===

			[[File:Thiol_disulfide_exchange.png\|thumb\|right\|Illustration of thiol-disulfide exchange reaction.]]

			Thiol-disulfide exchange is a common reaction where a thiol group attacks a disulfide bond, resulting in the formation of a new disulfide and a new thiol. This reaction is important in [[redox]] biology and protein folding.

			== Industrial and Environmental Aspects ==

			Disulfides are also found in various industrial and environmental contexts. For example, [[carbon disulfide]] is used as a solvent and in the production of [[rayon]] and [[cellophane]].

			[[File:Carbon-disulfide-3D-balls.png\|thumb\|left\|3D structure of carbon disulfide.]]

			== Mineralogy ==

			Disulfide bonds are present in some minerals, such as [[molybdenite]], which contains molybdenum disulfide (MoS₂).

			[[File:Molybdenite-3D-balls.png\|thumb\|right\|3D structure of molybdenite.]]

			== Related Pages ==

			* [[Thiol]]
	* [[Cysteine]]		* [[Cysteine]]
	* [[Protein ~~structure~~]]		* [[Protein folding]]
	* [[~~Endoplasmic reticulum]]~~		* [[Redox]]
	* [[Protein disulfide isomerase]]

	[[Category:~~Biochemistry~~]]		[[Category:Chemical bonding]]
	[[Category:~~Protein structure~~]]		[[Category:Proteins]]
			[[Category:Organosulfur compounds]]

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	~~'''Disulfide''' is a type of [[chemical bond]] that is characterized by the linkage of two [[sulfur]] atoms. This bond is commonly found in many different types of [[organic compound~~\|~~organic compounds]], including some [[protein]]s and [[enzyme]]s. The presence~~ of disulfide bonds ~~can greatly influence the [[molecular structure]] and function of these compounds.~~		{{Short description\|Overview of disulfide bonds in biochemistry}}

	==~~Formation of~~ Disulfide Bonds==		==Disulfide Bonds==
	Disulfide ~~bonds are formed through the process~~ of ~~[[oxidation~~]]~~, where~~ two [[thiol]] groups ~~lose their [[hydrogen]] atoms and form a bond with each other~~. ~~This process is often facilitated by enzymes known as [[protein~~ disulfide ~~isomerase]]s~~.		[[File:Disulfide-bond.png\|thumb\|right\|200px\|Diagram of a disulfide bond between two cysteine residues.]]
			A '''disulfide bond''' (also known as an '''S-S bond''' or '''disulfide bridge''') is a covalent bond derived from two thiol groups. In biochemistry, disulfide bonds are crucial for the stabilization of the tertiary and quaternary structures of proteins.

	==~~Role in Proteins~~ and ~~Enzymes~~==		==Formation and Structure==
	~~In proteins and enzymes~~, ~~disulfide bonds play a crucial role~~ in ~~maintaining~~ the ~~correct three-dimensional structure. They can link different parts~~ of ~~the same protein molecule together, or they can link different protein molecules together~~. This can ~~help to stabilize the protein and ensure that it functions correctly.~~		Disulfide bonds are formed by the oxidation of two [[cysteine]] residues, resulting in the linkage of their sulfur atoms. This reaction can be represented as:

	~~==Disulfide Bonds in Biochemistry==~~		: 2 R-SH _ R-S-S-R + 2 H_ + 2 e_
	In the field of [[biochemistry]], disulfide bonds are of great interest due to their role in protein structure and function. They are often studied in relation to diseases that are caused by misfolded proteins, such as [[Alzheimer's disease]] and [[Parkinson's disease]].

	==~~See Also~~==		where R-SH represents a thiol group. The resulting bond is a covalent linkage between the sulfur atoms of two cysteine residues, forming a cystine.
	* [[~~Chemical~~ bond]]
	* [[~~Sulfur~~]]		==Role in Protein Structure==
	* [[~~Protein~~]]		[[File:Protein-disulfide-bond.png\|thumb\|left\|200px\|Disulfide bonds help stabilize protein structures.]]
	* [[~~Enzyme~~]]		Disulfide bonds play a critical role in the folding and stability of proteins. They are often found in extracellular proteins and secreted proteins, where they help maintain structural integrity under varying environmental conditions. The presence of disulfide bonds can significantly increase the thermal and chemical stability of proteins.
	* [[~~Oxidation~~]]
	* [[~~Thiol~~]]		==Biological Significance==
	* [[~~Hydrogen~~]]		Disulfide bonds are essential in the formation of the active conformation of many proteins. For example, they are crucial in the structure of antibodies, insulin, and many enzymes. In antibodies, disulfide bonds link the heavy and light chains, stabilizing the overall structure.

			==Disulfide Bond Formation==
			The formation of disulfide bonds in proteins occurs in the [[endoplasmic reticulum]] of eukaryotic cells. This process is facilitated by protein disulfide isomerase (PDI), which catalyzes the formation and rearrangement of disulfide bonds.

			==Reduction and Rearrangement==
			Disulfide bonds can be reduced back to thiol groups by reducing agents such as [[dithiothreitol]] (DTT) or [[_-mercaptoethanol]]. This reduction is often used in laboratory settings to denature proteins for analysis by [[SDS-PAGE]].

			==Applications in Biotechnology==
			Disulfide bonds are exploited in biotechnology for the design of stable protein therapeutics and in the engineering of proteins with enhanced stability. They are also used in the development of biosensors and other diagnostic tools.

			==Related Pages==
			* [[Cysteine]]
			* [[Protein structure]]
			* [[Endoplasmic reticulum]]
	* [[Protein disulfide isomerase]]		* [[Protein disulfide isomerase]]
	* [[Biochemistry]]
	* [[Alzheimer's disease]]
	* [[Parkinson's disease]]

	~~[[Category:Chemical bonds]]~~
	[[Category:Biochemistry]]		[[Category:Biochemistry]]
	[[Category:~~Proteins~~]]		[[Category:Protein structure]]
	~~[[Category:Enzymes]]~~

	~~{{stub}}~~
	~~<gallery>~~
	~~File:Cystine-from-xtal-Mercury-3D-balls-thin.png\|Disulfide~~
	~~File:Lipoic-acid-from-xtal-3D-bs-17.png\|Disulfide~~
	~~File:Diphenyl-disulfide-from-xtal-3D-balls.png\|Disulfide~~
	~~File:Thiol_disulfide_exchange.png\|Disulfide~~
	~~File:Disulfide_Bridges_(SCHEMATIC)_V.1.svg\|Disulfide~~
	~~File:Cystine-skeletal.png\|Disulfide~~
	~~File:Pyrite-unit-cell-3D-balls.png\|Disulfide~~
	~~File:Disulfur-dichloride-3D-balls.png\|Disulfide~~
	~~File:Carbon-disulfide-3D-balls.png\|Disulfide~~
	~~File:Molybdenite-3D-balls.png\|Disulfide~~
	~~</gallery>~~

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	{{stub}}		{{stub}}
			<gallery>
			File:Cystine-from-xtal-Mercury-3D-balls-thin.png\|Disulfide
			File:Lipoic-acid-from-xtal-3D-bs-17.png\|Disulfide
			File:Diphenyl-disulfide-from-xtal-3D-balls.png\|Disulfide
			File:Thiol_disulfide_exchange.png\|Disulfide
			File:Disulfide_Bridges_(SCHEMATIC)_V.1.svg\|Disulfide
			File:Cystine-skeletal.png\|Disulfide
			File:Pyrite-unit-cell-3D-balls.png\|Disulfide
			File:Disulfur-dichloride-3D-balls.png\|Disulfide
			File:Carbon-disulfide-3D-balls.png\|Disulfide
			File:Molybdenite-3D-balls.png\|Disulfide
			</gallery>

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2024-02-22T02:38:25Z

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New page

'''Disulfide''' is a type of [[chemical bond]] that is characterized by the linkage of two [[sulfur]] atoms. This bond is commonly found in many different types of [[organic compound|organic compounds]], including some [[protein]]s and [[enzyme]]s. The presence of disulfide bonds can greatly influence the [[molecular structure]] and function of these compounds.

==Formation of Disulfide Bonds==
Disulfide bonds are formed through the process of [[oxidation]], where two [[thiol]] groups lose their [[hydrogen]] atoms and form a bond with each other. This process is often facilitated by enzymes known as [[protein disulfide isomerase]]s.

==Role in Proteins and Enzymes==
In proteins and enzymes, disulfide bonds play a crucial role in maintaining the correct three-dimensional structure. They can link different parts of the same protein molecule together, or they can link different protein molecules together. This can help to stabilize the protein and ensure that it functions correctly.

==Disulfide Bonds in Biochemistry==
In the field of [[biochemistry]], disulfide bonds are of great interest due to their role in protein structure and function. They are often studied in relation to diseases that are caused by misfolded proteins, such as [[Alzheimer's disease]] and [[Parkinson's disease]].

==See Also==
* [[Chemical bond]]
* [[Sulfur]]
* [[Protein]]
* [[Enzyme]]
* [[Oxidation]]
* [[Thiol]]
* [[Hydrogen]]
* [[Protein disulfide isomerase]]
* [[Biochemistry]]
* [[Alzheimer's disease]]
* [[Parkinson's disease]]

[[Category:Chemical bonds]]
[[Category:Biochemistry]]
[[Category:Proteins]]
[[Category:Enzymes]]

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← Older revision		Revision as of 12:19, 18 February 2025
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	{{stub}}		{{stub}}
			<gallery>
			File:Cystine-from-xtal-Mercury-3D-balls-thin.png\|Disulfide
			File:Lipoic-acid-from-xtal-3D-bs-17.png\|Disulfide
			File:Diphenyl-disulfide-from-xtal-3D-balls.png\|Disulfide
			File:Thiol_disulfide_exchange.png\|Disulfide
			File:Disulfide_Bridges_(SCHEMATIC)_V.1.svg\|Disulfide
			File:Cystine-skeletal.png\|Disulfide
			File:Pyrite-unit-cell-3D-balls.png\|Disulfide
			File:Disulfur-dichloride-3D-balls.png\|Disulfide
			File:Carbon-disulfide-3D-balls.png\|Disulfide
			File:Molybdenite-3D-balls.png\|Disulfide
			</gallery>