From Proteopedia
proteopedia linkproteopedia link Apolipoprotein A-I
Structure
| Apolipoproteins are proteins that coat lipoprotein surface that binds lipids such as cholesterol, low-density lipoprotein (LDL), or high-density lipoproteins (HDL) in lipid metabolism. They function in the transport of such lipids in their structure that acts as a ligand to cell receptors and lipid transport proteins. [1] They are important in the binding and transportation of lipids throughout the body, necessary in energy structural components, and nutrients.
Apolipoprotein A-I is a protein of APOA1 gene located on the 11th chromosome found in humans that is a component of HDL. Gene for APOA1 protein contains a total of 4 exons that is synthesized for the protein, used in lipid metabolism of HDL. [2]
Apolipoprotein a-1 (apoA-I) is a fairly small molecule that consists of a total of 243 residues and is 29-kD polypeptide in size. Structure in is shown in rainbow, in arrangement from N-terminus (red) of amine group to C-terminus (dark blue) end of carboxyl group.
Function
Apolipoprotein A-I contains amphipathic structure sequences of helices in its repeating hydrophilic and non-polar hydrophobic groups that form helices are what allows the interaction between hydrophobic properties of water, such as in the blood stream and hydrophobic lipids.
Apolipoprotein A-I is a protein APOA1 gene in humans that is a component of HDL, which a form of good cholesterol in human's diet, used in the transport of cholesterol and phospholipids in the body through the bloodstream in the reverse transport of cholesterol from the tissues to the liver of hepatocytes. They promote cholesterol efflux, a pathway in transferring intracellular cholesterol to extracellular acceptors, from tissues and act as a cofactor for the lecithin cholesterol acyltransferase (LCAT).[3]
Clinical significance
Apolipoprotein A-1 is found to be as an indicator for cardiovascular disease and atherosclerotic cardiovascular disease. Since APOA1 is a component of HDL associated with good form of cholesterol, when ABOAB (apolipoprotein B) a component of LDL, a form of bad cholesterol levels are elevated in blood can signal as a risk factor for development in hardening of arterial walls. [4]
Relevance
Structural highlights
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References
1. Voet, D., Voet, J. G., & Pratt, C. W. (2016). Fundamentals of Biochemistry (5th ed.). Hoboken, NJ: John Wiley & Sons.
- ↑ Voet, D., Voet, J. G., & Pratt, C. W. (2016). Fundamentals of Biochemistry (5th ed.). Hoboken, NJ: John Wiley & Sons.
- ↑ APOA1 gene: MedlinePlus Genetics. (2020, August 18). Retrieved October 26, 2020, from https://medlineplus.gov/genetics/gene/apoa1/
- ↑ Yano, K., Ohkawa, R., Sato, M., Yoshimoto, A., Ichimura, N., Kameda, T., . . . Tozuka, M. (2016, November 09). Cholesterol Efflux Capacity of Apolipoprotein A-I Varies with the Extent of Differentiation and Foam Cell Formation of THP-1 Cells. Retrieved November 14, 2020, from https://www.hindawi.com/journals/jl/2016/9891316/
- ↑ Test ID: APOAB Apolipoprotein A1 and B, Serum. (n.d.). Retrieved November 14, 2020, from Test ID: APOAB Apolipoprotein A1 and B, Serum. (n.d.). Retrieved November 14, 2020, from Test ID: APOAB Apolipoprotein A1 and B, Serum
2. APOA1 gene: MedlinePlus Genetics. (2020, August 18). Retrieved October 26, 2020, from https://medlineplus.gov/genetics/gene/apoa1/
3. Mangaraj, M., Nanda, R., & Panda, S. (2016, July). Apolipoprotein A-I: A Molecule of Diverse Function. Retrieved November 04, 2020, from https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4910842
4. Yano, K., Ohkawa, R., Sato, M., Yoshimoto, A., Ichimura, N., Kameda, T., . . . Tozuka, M. (2016, November 09). Cholesterol Efflux Capacity of Apolipoprotein A-I Varies with the Extent of Differentiation and Foam Cell Formation of THP-1 Cells. Retrieved November 14, 2020, from https://www.hindawi.com/journals/jl/2016/9891316/
5. Test ID: APOAB Apolipoprotein A1 and B, Serum. (n.d.). Retrieved November 14, 2020, from Test ID: APOAB Apolipoprotein A1 and B, Serum. (n.d.). Retrieved November 14, 2020, from Test ID: APOAB Apolipoprotein A1 and B, Serum
