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blood albumin
Available structures PDB Ortholog search: PDBe RCSB List of PDB id codes 1AO6, 1BJ5, 1BKE, 1BM0, 1E78, 1E7A, 1E7B, 1E7C, 1E7E, 1E7F, 1E7G, 1E7H, 1E7I, 1GNI, 1GNJ, 1H9Z, 1HA2, 1HK1, 1HK2, 1HK3, 1HK4, 1HK5, 1N5U, 1O9X, 1TF0, 1UOR, 1YSX, 2BX8, 2BXA, 2BXB, 2BXC, 2BXD, 2BXF, 2BXG, 2BXH, 2BXI, 2BXK, 2BXL, 2BXM, 2BXN, 2BXO, 2BXP, 2BXQ, 2I2Z, 2I30, 2VDB, 2VUE, 2VUF, 2XSI, 2XVQ, 2XVU, 2XVV, 2XVW, 2XW0, 2XW1, 2YDF, 3A73, 3B9L, 3B9M, 3CX9, 3JQZ, 3JRY, 3LU6, 3LU7, 3LU8, 3SQJ, 3TDL, 3UIV, 4E99, 4EMX, 4G03, 4G04, 4HGK, 4HGM, 4IW1, 4IW2, 4K2C, 4L8U, 4L9K, 4L9Q, 4LA0, 4LB9, 4LB2, 2N0X, 2ESG, 4S1Y, 4N0F, 4Z69, 4N0U, 4K71, 2BXE, 4BKE, 5IJF, 5ID7, 5IFO, 5FUO
Identifiers
Aliases	ALB, ANALBA, FDAH, PRO0883, PRO0903, PRO1341, albumin, HSA, FDAHT, serum albumin
External IDs	OMIM: 103600; MGI: 87991; HomoloGene: 405; GeneCards: ALB; OMA:ALB - orthologs
Gene location (Human) Chr. Chromosome 4 (human) Band 4q13.3 Start 73,397,114 bp End 73,421,482 bp
Gene location (Mouse) Chr. Chromosome 5 (mouse) Band 5 E1|5 44.7 cM Start 90,608,756 bp End 90,624,461 bp
RNA expression pattern Bgee Human Mouse (ortholog) Top expressed in liver right lobe of liver body of pancreas kidney tubule islet of Langerhans human kidney epithelium of colon glomerulus metanephric glomerulus testicle Top expressed in gallbladder left lobe of liver fetal liver hematopoietic progenitor cell human fetus atrioventricular valve abdominal wall sexually immature organism upper lip white adipose tissue muscle of thorax More reference expression data BioGPS More reference expression data
Gene ontology Molecular function DNA binding oxygen binding chaperone binding metal ion binding antioxidant activity protein binding identical protein binding pyridoxal phosphate binding copper ion binding lipid binding toxic substance binding fatty acid binding exogenous protein binding Cellular component cytoplasm Golgi apparatus blood microparticle myelin sheath extracellular region endoplasmic reticulum extracellular exosome platelet alpha granule lumen nucleus extracellular space endoplasmic reticulum lumen protein-containing complex Biological process sodium-independent organic anion transport hemolysis by symbiont of host erythrocytes cellular response to starvation platelet degranulation negative regulation of apoptotic process receptor-mediated endocytosis maintenance of mitochondrion location retina homeostasis bile acid and bile salt transport negative regulation of programmed cell death cellular oxidant detoxification high-density lipoprotein particle remodeling post-translational protein modification transport negative regulation of protein oligomerization Sources:Amigo / QuickGO
Orthologs Species Human Mouse Entrez 213 11657 Ensembl ENSG00000163631 ENSMUSG00000029368 UniProt P02768 P07724 RefSeq (mRNA) NM_000477 NM_009654 RefSeq (protein) NP_000468 NP_033784 Location (UCSC) Chr 4: 73.4 – 73.42 Mb Chr 5: 90.61 – 90.62 Mb PubMed search
Wikidata
View/Edit Human View/Edit Mouse

Human serum albumin is the serum albumin found in human blood. It is the most abundant protein in human blood plasma; it constitutes about half of serum protein. It is produced in the liver. It is soluble in water, and it is monomeric.

Albumin transports hormones, fatty acids, and other compounds, buffers pH, and maintains oncotic pressure, among other functions.

Albumin is synthesized in the liver as preproalbumin, which has an N-terminal peptide that is removed before the nascent protein is released from the rough endoplasmic reticulum. The product, proalbumin, is in turn cleaved in the Golgi apparatus to produce the secreted albumin.

The reference range for albumin concentrations in serum is approximately 35–50 g/L (3.5–5.0 g/dL). It has a serum half-life of approximately 21 days. It has a molecular mass of 66.5 kDa.

The gene for albumin is located on chromosome 4 in locus 4q13.3 and mutations in this gene can result in anomalous proteins. The human albumin gene is 16,961 nucleotides long from the putative 'cap' site to the first poly(A) addition site. It is split into 15 exons that are symmetrically placed within the 3 domains thought to have arisen by triplication of a single primordial domain.

Human serum albumin (HSA) is a highly water-soluble globular monomeric plasma protein with a relative molecular weight of 67 KDa, consisting of 585 amino acid residues, one sulfhydryl group and 17 disulfide bridges. Among nanoparticulate carriers, HSA nanoparticles have long been the center of attention in the pharmaceutical industry due to their ability to bind to various drug molecules, great stability during storage and in vivo usage, no toxicity and antigenicity, biodegradability, reproducibility, scale up of the production process and a better control over release properties. In addition, significant amounts of drug can be incorporated into the particle matrix because of the large number of drug binding sites on the albumin molecule.

Function

• Maintains oncotic pressure
• Transports thyroid hormones
• Transports other hormones, in particular, ones that are fat-soluble
• Transports fatty acids ("free" fatty acids) to the liver and to myocytes for utilization of energy
• Transports unconjugated bilirubin
• Transports many drugs; serum albumin levels can affect the half-life of drugs. Competition between drugs for albumin binding sites may cause drug interaction by increasing the free fraction of one of the drugs, thereby affecting potency.
• Competitively binds calcium ions (Ca)
• Serum albumin, as a negative acute-phase protein, is down-regulated in inflammatory states. As such, it is not a valid marker of nutritional status; rather, it is a marker of an inflammatory state
• Prevents photodegradation of folic acid
• Prevent pathogenic effects of Clostridioides difficile toxins

Measurement

Serum albumin is commonly measured by recording the change in absorbance upon binding to a dye such as bromocresol green or bromocresol purple.

Reference ranges

The normal range of human serum albumin in adults (> 3 y.o.) is 3.5–5.0  g/dL (35–50 g/L). For children less than three years of age, the normal range is broader, 2.9–5.5 g/dL.

Low albumin (hypoalbuminemia) may be caused by liver disease, nephrotic syndrome, burns, protein-losing enteropathy, malabsorption, malnutrition, late pregnancy, artefact, genetic variations and malignancy.

High albumin (hyperalbuminemia) is almost always caused by dehydration. In some cases of retinol (Vitamin A) deficiency, the albumin level can be elevated to high-normal values (e.g., 4.9 g/dL) because retinol causes cells to swell with water. (This is also the reason too much Vitamin A is toxic.) This swelling also likely occurs during treatment with 13-cis retinoic acid (isotretinoin), a pharmaceutical for treating severe acne, amongst other conditions. In lab experiments it has been shown that all-trans retinoic acid down regulates human albumin production.

Pathology

Hypoalbuminemia

Hypoalbuminemia means low blood albumin levels. This can be caused by:

• Liver disease; cirrhosis of the liver is most common
• Excess excretion by the kidneys (as in nephrotic syndrome)
• Excess loss in bowel (protein-losing enteropathy, e.g., Ménétrier's disease)
• Burns (plasma loss in the absence of skin barrier)
• Redistribution (hemodilution , increased vascular permeability or decreased lymphatic clearance)
• Acute disease states (referred to as a negative acute-phase protein)
• Malnutrition and wasting
• Mutation causing analbuminemia (very rare)
• Anorexia nervosa (most common cause in adolescents)

In clinical medicine, hypoalbuminemia significantly correlates with a higher mortality rates in several conditions such as heart failure, post-surgery, COVID-19.

Hyperalbuminemia

Hyperalbuminemia is an increased concentration of albumin in the blood. Typically, this condition is due to dehydration. Hyperalbuminemia has also been associated with high protein diets.

Medical use

Albumin human

Clinical data
AHFS/Drugs.com	Monograph
License data	US DailyMed: albumin human
ATC code	B05AA01 (WHO)
Identifiers
ECHA InfoCard	100.029.706

Human albumin solution (HSA) is available for medical use, usually at concentrations of 5–25%.

Human albumin is often used to replace lost fluid and help restore blood volume in trauma, burns and surgery patients. There is no strong medical evidence that albumin administration (compared to saline) saves lives for people who have hypovolaemia or for those who are critically ill due to burns or hypoalbuminaemia. It is also not known if there are people who are critically ill that may benefit from albumin. Therefore, the Cochrane Collaboration recommends that it should not be used, except in clinical trials.

In acoustic droplet vaporization (ADV), albumin is sometimes used as a surfactant. ADV has been proposed as a cancer treatment by means of occlusion therapy.

Human serum albumin may be used to potentially reverse drug/chemical toxicity by binding to free drug/agent.

Human albumin may also be used in treatment of decompensated cirrhosis.

Human serum albumin has been used as a component of a frailty index.

Glycation

It has been known for a long time that human blood proteins like hemoglobin and serum albumin may undergo a slow non-enzymatic glycation, mainly by formation of a Schiff base between ε-amino groups of lysine (and sometimes arginine) residues and glucose molecules in blood (Maillard reaction). This reaction can be inhibited in the presence of antioxidant agents. Although this reaction may happen normally, elevated glycoalbumin is observed in diabetes mellitus.

Glycation has the potential to alter the biological structure and function of the serum albumin protein.

Moreover, the glycation can result in the formation of Advanced Glycation End-Products (AGE), which result in abnormal biological effects. Accumulation of AGEs leads to tissue damage via alteration of the structures and functions of tissue proteins, stimulation of cellular responses, through receptors specific for AGE-proteins, and generation of reactive oxygen intermediates. AGEs also react with DNA, thus causing mutations and DNA transposition. Thermal processing of proteins and carbohydrates brings major changes in allergenicity. AGEs are antigenic and represent many of the important neoantigens found in cooked or stored foods. They also interfere with the normal product of nitric oxide in cells.

Although there are several lysine and arginine residues in the serum albumin structure, very few of them can take part in the glycation reaction.

Oxidation

The albumin is the predominant protein in most body fluids, its Cys34 represents the largest fraction of free thiols within the body. The albumin Cys34 thiol exists in both reduced and oxidized forms. In plasma of healthy young adults, 70–80% of total HSA contains the free sulfhydryl group of Cys34 in a reduced form or mercaptoalbumin (HSA-SH). However, in pathological states characterized by oxidative stress such as kidney disease, liver disease and diabetes the oxidized form, or non-mercaptoalbumin (HNA), could predominate. The albumin thiol reacts with radical hydroxyl (.OH), hydrogen peroxide (H₂O₂) and the reactive nitrogen species as peroxynitrite (ONOO.), and have been shown to oxidize Cys34 to sulfenic acid derivate (HSA-SOH), it can be recycled to mercapto-albumin; however at high concentrations of reactive species leads to the irreversible oxidation to sulfinic (HSA-SO2H) or sulfonic acid (HSA-SO3H) affecting its structure. Presence of reactive oxygen species (ROS), can induce irreversible structural damage and alter protein activities.

Loss via kidneys

In the healthy kidney, albumin's size and negative electric charge exclude it from excretion in the glomerulus. This is not always the case, as in some diseases including diabetic nephropathy, which can sometimes be a complication of uncontrolled or of longer term diabetes in which proteins can cross the glomerulus. The lost albumin can be detected by a simple urine test. Depending on the amount of albumin lost, a patient may have normal renal function, microalbuminuria, or albuminuria.

Interactions

Human serum albumin has been shown to interact with FCGRT.

It might also interact with a yet-unidentified albondin (gp60), a certain pair of gp18/gp30, and some other proteins like osteonectin, hnRNPs, calreticulin, cubilin, and megalin.

See also

• Bovine serum albumin
• Serum albumin

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Further reading

• Komatsu T, Nakagawa A, Curry S, Tsuchida E, Murata K, Nakamura N, Ohno H (September 2009). "The role of an amino acid triad at the entrance of the heme pocket in human serum albumin for O(2) and CO binding to iron protoporphyrin IX". Organic & Biomolecular Chemistry. 7 (18): 3836–3841. doi:10.1039/b909794e. PMID 19707690.
• Milojevic J, Raditsis A, Melacini G (November 2009). "Human serum albumin inhibits Abeta fibrillization through a "monomer-competitor" mechanism". Biophysical Journal. 97 (9): 2585–2594. Bibcode:2009BpJ....97.2585M. doi:10.1016/j.bpj.2009.08.028. PMC 2770600. PMID 19883602.
• Silva AM, Hider RC (October 2009). "Influence of non-enzymatic post-translation modifications on the ability of human serum albumin to bind iron. Implications for non-transferrin-bound iron speciation". Biochimica et Biophysica Acta. 1794 (10): 1449–1458. doi:10.1016/j.bbapap.2009.06.003. PMID 19505594.
• Otosu T, Nishimoto E, Yamashita S (February 2010). "Multiple conformational state of human serum albumin around single tryptophan residue at various pH revealed by time-resolved fluorescence spectroscopy". Journal of Biochemistry. 147 (2): 191–200. doi:10.1093/jb/mvp175. PMID 19884191.
• Blindauer CA, Harvey I, Bunyan KE, Stewart AJ, Sleep D, Harrison DJ, et al. (August 2009). "Structure, properties, and engineering of the major zinc binding site on human albumin". The Journal of Biological Chemistry. 284 (34): 23116–23124. doi:10.1074/jbc.M109.003459. PMC 2755717. PMID 19520864.
• Juárez J, López SG, Cambón A, Taboada P, Mosquera V (July 2009). "Influence of electrostatic interactions on the fibrillation process of human serum albumin". The Journal of Physical Chemistry B. 113 (30): 10521–10529. doi:10.1021/jp902224d. PMID 19572666.
• Fu BL, Guo ZJ, Tian JW, Liu ZQ, Cao W (August 2009). "". Xi Bao Yu Fen Zi Mian Yi Xue Za Zhi = Chinese Journal of Cellular and Molecular Immunology. 25 (8): 674–677. PMID 19664386.
• Ascenzi P, di Masi A, Coletta M, Ciaccio C, Fanali G, Nicoletti FP, et al. (November 2009). "Ibuprofen impairs allosterically peroxynitrite isomerization by ferric human serum heme-albumin". The Journal of Biological Chemistry. 284 (45): 31006–31017. doi:10.1074/jbc.M109.010736. PMC 2781501. PMID 19734142.
• Sowa ME, Bennett EJ, Gygi SP, Harper JW (July 2009). "Defining the human deubiquitinating enzyme interaction landscape". Cell. 138 (2): 389–403. doi:10.1016/j.cell.2009.04.042. PMC 2716422. PMID 19615732.
• Curry S (August 2002). "Beyond expansion: structural studies on the transport roles of human serum albumin". Vox Sanguinis. 83 (Suppl 1): 315–319. doi:10.1111/j.1423-0410.2002.tb05326.x. PMID 12617161. S2CID 44482133.
• Guo S, Shi X, Yang F, Chen L, Meehan EJ, Bian C, Huang M (September 2009). "Structural basis of transport of lysophospholipids by human serum albumin". The Biochemical Journal. 423 (1): 23–30. doi:10.1042/BJ20090913. PMID 19601929.
• de Jong PE, Gansevoort RT (2009). "Focus on microalbuminuria to improve cardiac and renal protection". Nephron Clinical Practice. 111 (3): c204-10, discussion c211. doi:10.1159/000201568. PMID 19212124.
• Page TA, Kraut ND, Page PM, Baker GA, Bright FV (September 2009). "Dynamics of loop 1 of domain I in human serum albumin when dissolved in ionic liquids". The Journal of Physical Chemistry B. 113 (38): 12825–12830. doi:10.1021/jp904475v. PMID 19711930.
• Roche M, Rondeau P, Singh NR, Tarnus E, Bourdon E (June 2008). "The antioxidant properties of serum albumin". FEBS Letters. 582 (13): 1783–1787. doi:10.1016/j.febslet.2008.04.057. PMID 18474236. S2CID 5364683.
• Wyatt AR, Wilson MR (February 2010). "Identification of human plasma proteins as major clients for the extracellular chaperone clusterin". The Journal of Biological Chemistry. 285 (6): 3532–3539. doi:10.1074/jbc.M109.079566. PMC 2823492. PMID 19996109.
• Cui FL, Yan YH, Zhang QZ, Qu GR, Du J, Yao XJ (February 2010). "A study on the interaction between 5-Methyluridine and human serum albumin using fluorescence quenching method and molecular modeling". Journal of Molecular Modeling. 16 (2): 255–262. doi:10.1007/s00894-009-0548-4. PMID 19588173. S2CID 9042021.
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External links

• Human Albumin structure in the Protein data bank
• Human Serum Albumin Archived 2006-04-24 at the Wayback Machine on the Human Protein Reference Database Archived 2006-04-24 at the Wayback Machine
• Albumin binding prediction
• Albumin at Lab Tests Online
• Albumin: analyte monograph from the Association for Clinical Biochemistry and Laboratory Medicine
• Overview of all the structural information available in the PDB for UniProt: P02768 (Serum albumin) at the PDBe-KB.

• Genes on human chromosome 4
• Blood proteins
• Liver function tests