Latest revision as of 14:15, 21 February 2025

Lipid[edit]

Lipids are a diverse group of biological molecules that are insoluble in water but soluble in nonpolar solvents. They play crucial roles in cell structure, energy storage, and signaling.

Classification[edit]

Lipids can be classified into several categories based on their structure and function:

Fatty Acids[edit]

Fatty acids are carboxylic acids with long hydrocarbon chains. They can be saturated or unsaturated, depending on the presence of double bonds.

Glycerolipids[edit]

Glycerolipids include triglycerides, which are the main form of stored energy in animals. They consist of glycerol esterified with three fatty acids.

Phospholipids[edit]

Phospholipids are a major component of cell membranes. They contain a glycerol backbone, two fatty acid tails, and a phosphate group.

Sphingolipids[edit]

Sphingolipids are important components of the myelin sheath of nerve cells. They are based on a sphingosine backbone.

Steroids[edit]

Steroids have a characteristic four-ring structure. Cholesterol is a well-known steroid that is a precursor to many hormones.

Eicosanoids[edit]

Eicosanoids are signaling molecules derived from arachidonic acid. They include prostaglandins, thromboxanes, and leukotrienes.

Terpenes[edit]

Terpenes are a large and diverse class of organic compounds produced by a variety of plants. They are the primary constituents of essential oils.

Functions[edit]

Lipids serve several key functions in biological systems:

Energy Storage: Lipids are a dense form of energy storage, providing more than twice the energy per gram compared to carbohydrates.
Structural Components: Phospholipids and cholesterol are essential components of cell membranes, providing structural integrity and fluidity.
Signaling Molecules: Lipids such as steroid hormones and eicosanoids play critical roles in cell signaling and regulation.

Related Pages[edit]

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-'''Lipids''' are a group of naturally occurring [[molecule|molecules]] that include [[fat|fats]], [[wax|waxes]], [[sterol|sterols]], [[fat-soluble vitamin|fat-soluble vitamins]] (such as vitamins A, D, E, and K), [[monoglyceride|monoglycerides]], [[diglyceride|diglycerides]], [[triglyceride|triglycerides]], and [[phospholipid|phospholipids]]. The main biological functions of lipids include storing energy, signaling, and acting as structural components of [[cell membrane|cell membranes]].
+= Lipid =
-== Structure and Function ==
+[[File:Common_lipid_types.svg|thumb|right|Common types of lipids]]
-Lipids are an extremely diverse group of molecules that share the common property of being insoluble in water. They are, however, soluble in other organic solvents. This property is due to the molecular structure of lipids, which is typically composed of a [[glycerol]] backbone bonded to long-chain [[fatty acid]]s.
+'''Lipids''' are a diverse group of [[biological molecules]] that are insoluble in water but soluble in nonpolar solvents. They play crucial roles in [[cell structure]], [[energy storage]], and [[signaling]].
-Lipids serve a variety of important functions in living organisms. They act as chemical messengers, serve as valuable energy sources, provide insulation, and make up the protective membranes that surround cells.
+== Classification ==
+Lipids can be classified into several categories based on their structure and function:
-== Classification ==
+=== Fatty Acids ===
+[[File:Fat_triglyceride_shorthand_formula.PNG|thumb|left|Structure of a triglyceride]]
+Fatty acids are carboxylic acids with long hydrocarbon chains. They can be saturated or unsaturated, depending on the presence of double bonds.
-Lipids can be classified into eight categories: [[fatty acid|fatty acids]], [[glycerolipid|glycerolipids]], [[glycerophospholipid|glycerophospholipids]], [[sphingolipid|sphingolipids]], [[sterol|sterols]], [[presterol|presterols]], [[saccharolipid|saccharolipids]], and [[polyketide|polyketides]].
+=== Glycerolipids ===
+Glycerolipids include [[triglycerides]], which are the main form of stored energy in animals. They consist of glycerol esterified with three fatty acids.
-== Metabolism ==
+=== Phospholipids ===
+[[File:Phosphatidyl-ethanolamine.svg|thumb|right|Structure of phosphatidylethanolamine]]
+Phospholipids are a major component of [[cell membranes]]. They contain a glycerol backbone, two fatty acid tails, and a phosphate group.
-The metabolism of lipids takes place in the [[mitochondria]], where they are broken down to produce energy. This process is known as [[beta-oxidation]]. Lipids are also involved in the synthesis of certain vitamins and hormones.
+=== Sphingolipids ===
+[[File:Sphingomyelin-horizontal-2D-skeletal.png|thumb|left|Structure of sphingomyelin]]
+Sphingolipids are important components of the [[myelin sheath]] of nerve cells. They are based on a sphingosine backbone.
-== Role in Disease ==
+=== Steroids ===
+[[File:Cholesterol.svg|thumb|right|Structure of cholesterol]]
+Steroids have a characteristic four-ring structure. [[Cholesterol]] is a well-known steroid that is a precursor to many hormones.
-Abnormal lipid metabolism can lead to a variety of health problems, including [[cardiovascular disease]], [[diabetes]], and [[obesity]]. High levels of certain types of lipids in the blood can lead to the formation of [[atherosclerosis]], a condition characterized by the buildup of fatty deposits in the arteries.
+=== Eicosanoids ===
+[[File:Prostacyclin-2D-skeletal.png|thumb|left|Structure of prostacyclin]]
+Eicosanoids are signaling molecules derived from [[arachidonic acid]]. They include prostaglandins, thromboxanes, and leukotrienes.
-== See Also ==
+=== Terpenes ===
+[[File:Geraniol_structure.png|thumb|right|Structure of geraniol]]
+Terpenes are a large and diverse class of organic compounds produced by a variety of plants. They are the primary constituents of essential oils.
-* [[Fatty acid metabolism]]
+== Functions ==
-* [[Lipid bilayer]]
+Lipids serve several key functions in biological systems:
-* [[Lipidomics]]
-* [[Lipid profile]]
-* [[Lipid raft]]
-* [[Lipid signaling]]
-* [[Lipid storage disorder]]
-* [[Lipid theory of aging]]
-== References ==
+* '''Energy Storage''': Lipids are a dense form of energy storage, providing more than twice the energy per gram compared to carbohydrates.
+* '''Structural Components''': Phospholipids and cholesterol are essential components of cell membranes, providing structural integrity and fluidity.
+* '''Signaling Molecules''': Lipids such as steroid hormones and eicosanoids play critical roles in cell signaling and regulation.
-<references />
+== Related Pages ==
+* [[Fatty acid]]
+* [[Triglyceride]]
+* [[Phospholipid]]
+* [[Steroid]]
+* [[Eicosanoid]]
+* [[Terpene]]
-[[Category:Biochemistry]]
-[[Category:Cell biology]]
-[[Category:Nutrition]]
-[[Category:Organic compounds]]
 [[Category:Lipids]]
-{{stub}}
-<gallery>
-File:Common_lipid_types.svg|Common lipid types
-File:Prostacyclin-2D-skeletal.png|Prostacyclin 2D skeletal
-File:Leukotriene_B4.svg|Leukotriene B4
-File:Fat_triglyceride_shorthand_formula.PNG|Fat triglyceride shorthand formula
-File:Phosphatidyl-ethanolamine.svg|Phosphatidyl ethanolamine
-File:Sphingomyelin-horizontal-2D-skeletal.png|Sphingomyelin horizontal 2D skeletal
-File:Cholesterol.svg|Cholesterol
-File:Geraniol_structure.png|Geraniol structure
-File:Kdo2-lipidA.png|Kdo2 lipid A
-File:Phospholipids_aqueous_solution_structures.svg|Phospholipids aqueous solution structures
-</gallery>

Lipid: Difference between revisions