2-Aminovaleric acid; α-Aminopentanoic acid; Propylglycine
3D model (JSmol)
|Molar mass||117.148 g·mol−1|
|Acidity (pKa)||2.36 (carboxyl), 9.76 (amino)|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
Norvaline (abbreviated as Nva) is an amino acid with the formula CH3(CH2)2CH(NH2)CO2H. The compound is an isomer of the more common amino acid valine. Like most other α-amino acids, norvaline is chiral. It is a white, water-soluble solid.
Norvaline is a non-proteinogenic unbranched-chain amino acid. It has previously been reported to be a natural component of an antifungal peptide of Bacillus subtilis. Norvaline and other modified unbranched chain amino acids have received attention because they appear to be incorporated in some recombinant proteins found in E. coli. Its biosynthesis has been examined. The incorporation of Nva into peptides reflects the imperfect selectivity of the associated aminoacyl-tRNA synthetase. In Miller–Urey experiments probing prebiotic synthesis of amino acids, norvaline, but also norleucine, are produced.
For mammalian cells an in vitro study showed that l-norvaline decreased cell viability at concentrations as low as 125 μM, and caused necrotic cell death and significant changes to mitochondrial morphology and function. Toxicity was reduced in the presence of structurally similar human protein building amino acids, suggesting l-norvaline's cytotoxicity could be attributed to protein amino acid mimicry.
Norvaline and norleucine (one hydrocarbon group longer) both possess the nor- prefix for historical reason, despite current conventional usage of the prefix to denote a missing hydrocarbon group (under which they would theoretically be called "dihomoalanine" and "trihomoalanine"). The name is not systematic, should be abandoned and the systematic name should be used.
Use in treatment of Alzheimer's disease
- Norvaline is a candidate drug for the treatment of Alzheimer's disease. It is a arginase inhibitor which readily crosses the blood brain barrier, and reduces arginine loss in the brain. Amyloid beta deposition is associated with L-arginine deprivation and neurodegeneration. Mice treated with Norvaline display improved spatial memory, increased neuroplasticity-related proteins, and decrease in amyloid beta.
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- Merriam-Webster Retrieved 4 September 2010
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- Alvarez-Carreño C, Becerra A, Lazcano A (October 2013). "Norvaline and norleucine may have been more abundant protein components during early stages of cell evolution". Origins of Life and Evolution of the Biosphere. 43 (4–5): 363–75. Bibcode:2013OLEB...43..363A. doi:10.1007/s11084-013-9344-3. PMID 24013929.
- Ming XF, Rajapakse AG, Carvas JM, Ruffieux J, Yang Z (2009). "Inhibition of S6K1 accounts partially for the anti-inflammatory effects of the arginase inhibitor L-norvaline". BMC Cardiovascular Disorders. 9: 12. doi:10.1186/1471-2261-9-12. PMC 2664787. PMID 19284655.
- reference.md Retrieved 4 September 2010[full citation needed]
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- Samardzic, Kate; Rodgers, Kenneth J. (2019-04-01). "Cytotoxicity and mitochondrial dysfunction caused by the dietary supplement l-norvaline". Toxicology in Vitro. 56: 163–171. doi:10.1016/j.tiv.2019.01.020. ISSN 0887-2333. PMID 30703532.
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- Polis B, Srikanth KD, Elliott E, Gil-Henn H, Samson AO (October 2018). "L-Norvaline Reverses Cognitive Decline and Synaptic Loss in a Murine Model of Alzheimer's Disease". Neurotherapeutics. 15 (4): 1036–1054. doi:10.1007/s13311-018-0669-5. PMC 6277292. PMID 30288668.