Albumin is a globular protein commonly found in blood plasma, egg white, milk, and plants. It is the most abundant circulating protein found in plasma, making up about 50% of the plasma's total protein content. It is synthesised in the liver and has a molecular weight of 66.5 kilodaltons.
Albumin is unique in that it is not modified with carbohydrates or sialic acid moieties and is enriched with glutamate and aspartate residues that make it acidic. It is also the only protein that is anionic, which means it binds readily to calcium in blood serum. This contributes greatly to plasma calcium levels.
Albumin is essential for maintaining the oncotic pressure needed for the proper distribution of body fluids between blood vessels and body tissues. It also acts as a plasma carrier by binding several hydrophobic steroid hormones, as well as a transport protein for hemin and fatty acids.
Characteristics | Values |
---|---|
Molecular Weight | 65,000-67,000 daltons |
Molecular Structure | 3 repeated homologous domains, each with 2 separate sub-domains, A and B |
Amino Acids | 585 |
Synthesis | Synthesized in the liver |
Excretion | Excreted into the bloodstream |
Function | Maintains plasma oncotic pressure and transports various substances called ligands |
Ligands | Endogenous: bilirubin, ions, fatty acids. Exogenous: drugs (e.g. methadone, propranolol, thiopental, furosemide, warfarin, methotrexate, alfentanil) |
Half-life | 16 hours |
Clinical Significance | A laboratory measurement and a colloid fluid administered to patients in need of fluid resuscitation |
What You'll Learn
- Serum albumin is a globular protein found in blood plasma
- It is synthesised in the liver and is the most abundant blood protein in mammals
- It is a carrier protein for steroids, fatty acids, and thyroid hormones
- It helps maintain oncotic pressure to regulate the distribution of body fluids
- It is negatively charged and binds with calcium in the blood
Serum albumin is a globular protein found in blood plasma
Serum albumin is a significant modulator of plasma oncotic pressure and a transporter of various substances called ligands. These ligands include endogenous ligands such as ions, fatty acids, and bilirubin, and exogenous ligands such as drugs.
Serum albumin is unique in several respects. It is not modified with carbohydrates or sialic acid moieties and is enriched with glutamate and aspartate residues that make it acidic. It is also highly conserved across many species, with mostly benign polymorphisms in the genes that code for this protein.
Serum albumin is clinically significant as its measurement can aid in providing insight into patients' liver function or their ability to biosynthesize proteins and factors vital to total body homeostasis.
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It is synthesised in the liver and is the most abundant blood protein in mammals
Albumin is synthesised in the liver and is the most abundant blood protein in mammals. In fact, it is the most abundant circulating protein found in the plasma of all vertebrates. In healthy human patients, albumin makes up about half of the plasma's total protein content, ranging from 3.5 to 5 grams per decilitre.
Albumin is synthesised in the liver by hepatocytes and is rapidly excreted into the bloodstream at a rate of 10 to 15 grams per day. Interestingly, very little albumin is stored in the liver itself, and most of it is quickly released into the bloodstream.
Albumin plays a crucial role in maintaining plasma oncotic pressure and transporting various substances called ligands. These ligands include endogenous molecules such as bilirubin, ions, and fatty acids, as well as exogenous compounds like drugs. For example, albumin transports drugs such as methadone, propranolol, thiopental, furosemide, warfarin, and many others.
The presence of albumin in the bloodstream is essential for maintaining proper plasma oncotic pressure, which, in turn, influences capillary membrane pressure. This pressure balance is crucial for the body's overall homeostasis.
In addition to its role in the bloodstream, albumin can also be found in the interstitial space and other fluids. However, when albumin is found in high concentrations in fluids like ascites or urine, it often indicates an underlying pathology.
Furthermore, albumin synthesis in the liver is closely tied to the body's nutritional status. Adequate nutrition is necessary for optimal albumin synthesis, and conditions such as malnutrition, inflammation, and exposure to hepatotoxins can inhibit its production.
Overall, albumin plays a vital role in maintaining the body's homeostasis and transporting essential molecules throughout the body, making it a crucial protein in mammalian biology.
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It is a carrier protein for steroids, fatty acids, and thyroid hormones
Albumin is a carrier protein for steroids, fatty acids, and thyroid hormones. It is a globular protein commonly found in blood plasma, egg white, milk, and plants. It is the most abundant blood protein in mammals and is produced by the liver.
Albumin is essential for maintaining the oncotic pressure needed for the proper distribution of body fluids between blood vessels and body tissues. It also acts as a transport protein for hemin and fatty acids. It binds and transports various bioactive molecules, including proteins, peptides, hormones, amino acids, drugs, nutrients, and metal ions.
Albumin has a variety of clinical and biotechnological applications. It is used in the treatment of hemorrhagic shock due to excessive blood loss, hypovolemia, hypoproteinemia, and fetal erythroblastosis. It is also used as a drug delivery vehicle for various ailments due to its high serum concentration, long half-life, and non-toxicity.
In addition, albumin is crucial for the transport of biologically active components essential for the growth and survival of eukaryotic cells. It plays a vital role in protecting cells from physical damage in bioreactors and is used in antibody production in hybridoma cell culture media. Overall, albumin's ability to interact with various molecules makes it a versatile and essential protein in the body.
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It helps maintain oncotic pressure to regulate the distribution of body fluids
Albumin is a protein synthesised in the liver and excreted into the bloodstream. It is the most abundant protein in the blood plasma of all vertebrates, making up around 50% of human plasma proteins. It is a globular protein and is water-soluble.
Albumin is essential for maintaining oncotic pressure, which is the pressure needed for the proper distribution of body fluids between blood vessels and body tissues. Without albumin, the high pressure in the blood vessels would force fluids out into the tissues. Albumin also acts as a plasma carrier by binding several hydrophobic steroid hormones, as well as a transport protein for hemin and fatty acids.
The oncotic pressure of blood is regulated by albumin's large molecular weight and negative charge. The negative charge allows albumin to attract positively charged molecules and water into the intravascular compartment. Albumin's influence on oncotic pressure has a major influence on capillary membrane pressure.
The liver does not prioritise albumin synthesis, which occurs when the body is adequately nourished. Poor nutrition, inflammation, exposure to hepatotoxins, and exposure to high colloid osmotic pressure can all inhibit albumin synthesis.
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It is negatively charged and binds with calcium in the blood
Serum albumin is a negatively charged protein that binds with calcium in the blood. It is a globular protein commonly found in blood plasma and is the most abundant protein in the blood plasma of all vertebrates. It is synthesised in the liver and excreted into the bloodstream.
Albumin is a vital protein for maintaining the oncotic pressure needed to properly distribute body fluids between blood vessels and body tissues. It also acts as a plasma carrier by binding with hydrophobic steroid hormones, hemin and fatty acids.
Albumin is encoded by the ALB gene and is a water-soluble, un-glycosylated serum protein with a molecular weight of 65,000 daltons. It is composed of 585 amino acids, which are organised into three repeated homologous domains, each with two separate sub-domains, A and B.
The negative charge on albumin is due to the abundance of aspartate and glutamate residues. This charge is essential for regulating blood pressure and preventing the filtration of albumin in urine.
Albumin contains eleven distinct binding domains for hydrophobic compounds and can bind with one hemin and six long-chain fatty acids simultaneously. It is also responsible for carrying hormones, vitamins and enzymes throughout the body.
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Frequently asked questions
Albumin is a family of globular proteins, the most common of which are serum albumins. It is the most abundant circulating protein found in plasma.
Albumin helps maintain the osmotic balance between intravascular and extravascular fluid and it is a carrier protein for calcium, bilirubin, and many drugs.
Albumin is not modified with carbohydrate or sialic acid moieties and it is enriched with glutamate and aspartate residues that make it acidic. It is also the most abundant protein in serum and is widely distributed in mammals.