Long Peptide Sequences

With the exception of a few hydrophobic sequences, solid-phase peptide synthesis (SPPS) techniques can produce the majority of proteinogenic-based peptides in a linear fashion. However, longer sequences, especially those that are longer than 70 amino acids, frequently need to be synthesized using different methods. Ineffective coupling and deprotection can be brought on by the protected peptide's poor solvation during synthesis and the creation of intermolecular hydrogen bonds (i.e., -sheets) among fragments.

Long peptide sequence synthesis is a specialty of CPC Scientific. We use a range of techniques to combat inadequate solvation and aggregation, some of which include:

Polar solvent mixtures (e.g., Magic Mixture, chaotropic salt additives)

Increased temperatures and microwave irradiation

Protected fragment condensation

Native Chemical Ligation (i.e., unprotected fragment condensation)

Low resin substitution and high-swelling resins

Polar solvent mixtures have been designed to boost reaction mixture polarity and add hydrogen bond acceptors to compete with -sheets that form between peptide fragments in order to lessen aggregation in SPPS. The 1992 invention of the "Magic Mixture" by Kent and colleagues, which combines DMF/DCM/NMP (1:1:1), 1% Triton X-100, and 2 M ethylenecarbonate (a powerful hydrogen-bond donor), has enhanced coupling efficiency in linear peptides and on-resin cyclizations.[3] It has been demonstrated that additional additions, such as chaotropic salts (LiCl, KSCN, and guanidine HCl), can help lessen aggregation brought on by peptide secondary structure.

While polar cocktails, high-swelling resins, and chaotropic additives have all increased coupling efficiency in SPPS for longer peptides, their advantages wear off with length, and the resulting crude peptides can be particularly difficult to filter. Some of these difficulties have been overcome by condensing orthogonally protected peptide segments. P-alkoxybenzyl alcohol and p-alkoxybenzyloxycarbonylhydrazide resins, which can be used to create protected peptide fragments with a free carboxylic acid or hydrazide group, were first presented by Wang in 1973.[4] Short peptide fragments are generally simple to prepare as protected fragments, but longer fragments (>10 AAs) may have poor solubility. Peptide diastereomers can also be produced by connecting segments without a C-terminal glycine residue.

In 1994, Dawson and Kent developed a straightforward method that eliminates the majority of challenges related to the coupling of protected fragments and enables the direct synthesis of big peptides and native proteins of modest size.[5] The reaction between a terminal cysteine-peptide and a peptide--thioester results in the native chemical ligation of unprotected peptide fragments. The unprotected side chains of the amino acids are not particularly reactive to peptide-thioalkyl esters, which are simple to manufacture. The couplings can proceed with side chain protective groups due to the esters' low reactivity, which makes it much simpler to dissolve the pieces. The requirement for a cysteine residue is the only downside of native chemical ligation, yet cysteines are quite common in big peptides and proteins.

For more informationabout sequence of peptide, please feel free to contact us!

There are many peptide manufacturers, but we are one of the best choices for you.

Other supplier products

	Stapled Peptides	Peptides that have been "hydrocarbon stapled" are peptides that have been chemically braced with an all-hydrocarbon staple at a specified position ...
	Semaglutide	Peptide semaglutideSequence: H-His-Aib-Glu-Gly-Thr-Phe-Thr-Ser-Asp-Val-Ser-Ser-Tyr-Leu-Glu-Gly-Gln-Ala-Ala-Lys(C18diacid-γ-Glu-OEG-OEG)]-Glu...
	Long Peptide Sequences	With the exception of a few hydrophobic sequences, solid-phase peptide synthesis (SPPS) techniques can produce the majority of proteinogenic-based ...
	Teduglutide	Teduglutide gattexSequence: H-His-Gly-Asp-Gly-Ser-Phe-Ser-Asp-Glu-Met-Asn-Thr-Ile-Leu-Asp-Asn-Leu-Ala-Ala-Arg-Asp-Phe-Ile-Asn-Trp-Leu-Ile-Gln-Thr-...
	Unnatural Amino Acids	Amino acids that are produced synthetically or occur naturally without being incorporated into proteins and peptides are referred to as nonnatural ...

供应产品

Same products

	外墙液态花岗岩材料 仿石材效果 耐用耐刮擦美观	卖方: 中山蓝翠鸟新型环保材料有限公司	产品概述 蓝翠鸟水包砂外墙涂料，是兼顾装饰性与功能性的高性能选择。它创造出逼真的仿石外观，并提供强大的防水、耐污、耐候保护，适用于各类建筑外墙的长期防护与美化。 产品优势 逼真...
	PH-89 防水高精度平面式酸碱测试仪	卖方: 科立龙电子股份有限公司	产品说明: 型号 PH-89/89P/89L 测量范围 PH 0.00～14.00PH Temp 0...
	PH-2022防水笔式高精度酸碱度/ 温度计	卖方: 科立龙电子股份有限公司	产品说明:特点： -基于微处理器的快速准确显示 -新的坚固耐用的人体工程学设计 -外观时尚小巧，携带方便 -大屏幕背光，清晰显示，同时显示温度 -带自动温度补偿 -主机防水IP65 ...
	PH-08防水笔式土壤PH计	卖方: 科立龙电子股份有限公司	产品说明: 型号 PH-08 测量范围 PH 0.00～14.00PH Temp 0～5...
	PH-08防水笔式土壤PH计	卖方: 科立龙电子股份有限公司	产品说明: 型号 PH-08 测量范围 PH 0.00～14.00PH Temp 0～5...