L-Asparagine

L-Asparagine price More Price(15)

Manufacturer	Product number	Product description	CAS number	Packaging	Price	Updated	Buy
Sigma-Aldrich	51363	L-Asparagine certified reference material, TraceCERT	70-47-3	100mg	$95.2	2018-11-13	Buy
Sigma-Aldrich	1043502	Asparagine anhydrous United States Pharmacopeia (USP) Reference Standard	70-47-3	200mg	$384.65	2018-11-13	Buy
Alfa Aesar	B21473	L-(+)-Asparagine, 99%	70-47-3	500g	$159	2018-11-15	Buy
Alfa Aesar	B21473	L-(+)-Asparagine, 99%	70-47-3	100g	$55.5	2018-11-15	Buy
Sigma-Aldrich	A0884	L-Asparagine ≥98% (HPLC)	70-47-3	10mg	$21.7	2018-11-13	Buy

L-Asparagine Chemical Properties,Uses,Production

Overview and history

Asparagine [symbol Asn or N]^[1] is a key α-amino acid that is used in the biosynthesis of proteins. It contains a α-amino group and a α-carboxylic acid group as well as a side chain carboxamide. It is classified as a polar [at physiological pH], aliphatic amino acid. It is non-essential in humans, and can undergo de novo synthesis inside the human body. From the aspect of genetic code during protein synthesis, it is encoded by the codons AAU and AAC^[2].
The discovery of L-Asn dates back over 200 years with its identification from natural sources by Delaville^[3] and first isolation by French chemists Vauquelin and Robiquet^[4] from spears of Asparagus sativus. Not only was Asn the first amino acid identified, it was one of the first examples of the preparation of a Damino acid by Piutti^[5]. Piutti was also credited with the determination of the chemical structure of Asn, and the first observation of enantioselectivity of a biological receptor, for his discovery of a difference in taste between D- and L-Asn. It was rapidly discovered that Asn is present in all higher plants, and Schulze and Winterstein^[6] were the first to show that, although present in small quantities in green plants, it accumulates under carbohydrate deficiency or starvation in general. Asn was also reported to be formed as a temporary N reserve during aberrations in normal protein metabolism, when excess ammonium is formed^[7]. Furthermore, the role of Asn as a translocated nitrogenous substance in a form suitable for subsequent re-synthesis from one organ of a plant to another was demonstrated by Chibnall^[8]. Murneek^[9] summarized the findings of several researchers at the time and reported that under carbohydrate depleted conditions excess protein unused by the plant is hydrolyzed by means of proteolytic enzymes and hence amino acids are formed including Asn.

Figure 1 The chemical structure of the L-asparagine ;

Synthesis and Metabolism

A major route for Asn biosynthesis is via the ATP-dependent transfer of the amide group of glutamine to the β-carboxyl group of aspartate by the action of asparagine synthetase[AS]. So far, two types of ASs, AsnA and AsnB, have been identified. While prokaryotes utilize AsnA type ASs that require ammonia as an amide donor as well as AsnB type ASs that can catalyze the reaction using either ammonium or glutamine as an amide donor, most eukaryotes only use AsnB type ASs^{[10, 11]}. AS is notably difficult to assay from plant tissues^[12]. AsnB-type ASs are members of the N-terminal nucleophile hydrolase[Ntn] group of glutamine amidotransferases^{[13, 14]}. They are characterized by an N-terminal cysteine nucleophilic residue producing a cysteinyl-glutamine tetrahedral intermediate from which ammonium is abstracted. Glutamate is released by hydrolysis of the resulting γ-glutamyl thioester intermediate. The ammonia is tunneled to a C-terminal transferase domain. This domain activates aspartate through ATP hydrolysis as a β-aspartyl AMP intermediate. Nucleophilic attack by the ammonia results in cleavage and release of Asn. There are two groups of AS enzymes in higher plants designated as class I and II. Results of kinetic analyses of recombinant maize AS enzymes indicated that class I enzymes may have specialized functions as they can have higher affinity for glutamine and their expression is restricted to specific tissues^[15]. The detailed schematic pathways of asparagine metabolic pathways are shown in Figure 2^[16].

Figure 2 Asparagine metabolic pathways Ammonium is assimilated into the glutamine-amide group for glutamine synthesis by the reaction of glutamine synthetase[GS]. Glutamate synthase[GOGAT] transfers the amide group of glutamine to the 2-position of 2-oxoglutarate, generating glutamate. Asparagine synthetase[AS] converts either the glutamine-amide group or ammonium into aspartate, yielding asparagine. Transamination of glutamate with oxaloacetate by aspartate aminotransferase[AspAT] generates aspartate, which serves as a substrate of asparagine synthesis. The asparagine amide group can be degraded by asparaginase[ASPG], yielding ammonium and aspartate. The asparagine amino group is hydrolyzed by asparagine aminotransferase[AsnAT], producing ammonium and 2-oxosucinamate. AsnAT catalyzes the transamination reaction of asparagine with glyoxylate, pyruvate, 4-hydroxypyruvate and 4-hydroxy 2-oxobutyrate as amino acceptors, producing glycine, alanine, serine and homoserine, respectively. 2-Oxosuccinamate is then converted to ammonium and oxaloacetate by ω-amidase.

Asparagine synthetase
Asparagine synthetase[l-aspartate: ammonia ligase[AMP-forming], EC 6.3.1.1] catalyzes the reversible conversion of l-aspartate, NH4+, and ATP to l-asparagine, AMP, and PPi. The enzyme is distributed widely in nature, but its enzymological properties have not been studied in detail. Pioneering studies have been made on the enzymes from lactic acid bacteria. The enzyme from Lactobacillus arabinosus can be stored at 4 ℃ for 3 weeks but not at–20℃^[17]. The optimum pH is 8.2, and the optimum temperature is about 40℃. The enzyme is specific for l-aspartate and does not act on l-glutamate. β-l-Aspartyl hydroxamate is synthesized when hydroxamate is added to the reaction mixture instead of NH4+. The enzyme requires Mg2+ and is activated by Mn2+. No activation of Mg2+ was observed for the E. coli^[18] and Streptococcus bovis enzymes.
Asparaginase
Asparaginase[l-asparagine amidohydrolase, EC 3.5.1.1] catalyzes the hydrolysis of the amido bond of l-asparagine and irreversibly produces l-aspartate and ammonia. The enzyme is widely distributed in microorganisms, animals, and plants. The bacterial enzymes from Acinetobacter calcoaceticus^[19], Bacillus coagulans[20], E. coli^[21], and Vibrio succinogenes^[22] also show enzymatic activity on d-asparagine. The enzyme from E. coli has been used for the industrial production of l-asparagine. Saccharomyces cerevisiae produces the enzyme both intracellularly and extracellularly^[23]. The synthesis of the enzyme is stimulated by nitrogen starvation, requires an available energy source, and is prevented by cycloheximide. The intracellular enzyme appears to be constitutive. The extracellular activity is relatively insensitive to p-hydroxymercuribenzoate inhibition, whereas the intracellular activity is highly inhibited by this compound.

References

1. www.sbcs.qmul.ac.uk/iupac/AminoAcid/AA1n2.html
2. Shu, Jian-Jun[2017]. "A new integrated symmetrical table for genetic codes". BioSystems. 151: 21–26.
3. Delaville M[1802] Sur les se`ves d’asperges et de choux. Ann Chim 41:298
4. Vuquelin LN, Robiquet PJ[1806] La de´couverte d’un nouveau principe ve´ge´tal dans le suc des asperges. Ann Chim 57:88–93
5. Piutti A[1886] Ein neues Asparagin. Ber Dtsch Chem Ges 19:1691–1695
6. Schulze E, Winterstein E[1910] Handbuch der biochemischen Arbeitsmethoden, vol 2. Berlin Urban & Schwarzenberg, Berlin, p 510
7. Prianischnikov D[1922] Das ammoniak als anfangs- und endprodukt des stickstoffumsatzes in den pflanzen. Landwirtsch Vers-Stat 99:267–286
8. Chibnall AC[1924] Investigations on the nitrogenous metabolism of the higher plants. VI. The role of asparagine in the metabolism of the mature plant. Biochem J 18:395–404
9. Murneek AE[1935] Physiological roˆle of asparagine and related substances in nitrogen metabolism of plants. Plant Physiol 10:447–464
10. Gaufichon L, Reisdorf-Cren M, Rothstein SJ, Chardon F, Suzuki A[2010] Biological functions of asparagine synthetase in plants. Plant Sci 179:141–153. doi:10.1016/j.plantsci.2010.04.010
11. Duff SMG[2015] Asparagine synthetase. In: D’Mello JPF[ed] Amino acids in higher plants. CAB International, Wallingford, pp 100–128
12. Romagni JG, Dayan FE[2000] Measuring asparagine synthetase activity in crude plant extracts. J Agric Food Chem 48:1692–1696
13. Larsen TM, Boehlein SK, Schuster SM, Richards NGJ, Thoden JB, Holden HM, Rayment I[1999] Three-dimensional structure of Escherichia coli asparagine synthetase B: a short journey from substrate to product. Biochemistry 38:16146–16157. doi:10.1021/bi9915768
14. Massie`re F, Badet-Denisot MA[1998] The mechanism of glutamine-dependent amidotransferases. Cell Mol Life Sci 54:205–222
15. Duff SMG, Qi Q, Reich T, Wu X, Brown T, Crowley JH, Fabbri B[2011] A kinetic comparison of asparagine synthetase isozymes from higher plants. Plant Physiol Biochem 49:251–256. doi:10.1016/j.plaphy.2010.12.006
16. Gaufichon, Laure, S. J. Rothstein, and A. Suzuki. "Asparagine Metabolic Pathways in Arabidopsis." Plant & Cell Physiology 57.4[2017]:675.
17. Meister A[1974] Asparagine synthesis. In: Boyer PD[ed] The Enzymes, 3rd edn, vol 10. Academic, New York, pp 561–580
18. Sugiyama A, Kato H, Nishioka T, Oda J[1992] Overexpression and purification of asparagines synthetase from Escherichia coli. Biosci Biotechnol Biochem 56:376–379
19. Joner PE, Kristiansen T, Einasson M[1973] Purification and properties of l-asparaginase A fromAcinetobacter calcoaceticus. Biochim Biophys Acta 327:146–456
20. Law AS, Wriston JC[1971] Purification and properties of Bacillus coagulans l-asparaginase. Arch Biochem Biophys 147:744–752
21. Peterson RG, Richards FF, Handschumacher RE[1977] Structure of peptide from active site region of Escherichia  coli l-asparaginase. J Biol Chem 252:2072–2076
22. Distasio JA, Niederman RA, Kafkewitz D, Goodman D[1976] Purification and characterization of l-asparaginase with antilymphoma activity from Vibrio succinogenes. J Biol Chem 251:6929–6933
23. Dunlop PC, Meyer GM, Ban D, Roon RJ[1978] Characterization of two forms of asparaginasein Saccharomyces cerevisiae. J Biol Chem 253:1297–1304

 

Chemical Properties

White crystalline powder

Definition

ChEBI: An optically active form of asparagine having L-configuration.

Purification Methods

Likely impurities are aspartic acid and tyrosine. Crystallise it from H2O or aqueous EtOH. It slowly effloresces in dry air. [Greenstein & Winitz The Chemistry of the Amino Acids J. Wiley, Vol 3 p 1856 1961, Beilstein 4 IV 3005.]

L-Asparagine Preparation Products And Raw materials

Raw materials

Preparation Products

L-Asparagine Suppliers

Supplier	Tel	Fax	Email	Country	ProdList	Advantage
Capot Chemical Co.,Ltd.	+86 (0)571-855 867 18	+86 (0)571-858 647 95	sales@capotchem.com	China	19954	60
Henan DaKen Chemical CO.,LTD.	+86-371-55531817		inquiry@dakenchem.com	CHINA	22119	58
Henan Tianfu Chemical Co.,Ltd.	0371-55170693	0371-55170693	info@tianfuchem.com	CHINA	20795	55
Mainchem Co., Ltd.	+86-0592-6210733	+86-0592-6210733	sales@mainchem.com	CHINA	32764	55
ATK CHEMICAL COMPANY LIMITED	+86 21 5161 9050/ 5187 7795	+86 21 5161 9052/ 5187 7796	ivan@atkchemical.com	CHINA	10714	60
Anhui Royal Chemical Co., Ltd.	+86-025-86736275		dana.jiang@royal-chem.com	CHINA	789	55
Hefei TNJ Chemical Industry Co.,Ltd.	86-0551-65418684 18949823763	86-0551-65418684	info@tnjchem.com	China	1465	55
Shanghai Zheyan Biotech Co., Ltd.	18017610038		zheyansh@163.com	CHINA	3625	58
career henan chemical co	+86-371-86658258		sales@coreychem.com	CHINA	10011	58
Shanghai Boyle Chemical Co., Ltd.	Mr Qiu:021-50182298(Demestic market) Miss Xu：021-50180596（Abroad market）	+86-21-57758967	sales@boylechem.com	China	2220	55

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