PRRVRLK acetate

PRRVRLK acetate is a synthetic peptide linker designed for fusion protein construction and peptide engineering research. Its defined amino acid sequence can provide a short, functional spacer between protein domains, helping support proper folding, accessibility, and modular protein design. PRRVRLK acetate is useful for preparing recombinant fusion proteins, designing peptide-linked biomolecules, and studying how linker composition influences protein stability and biological activity. This peptide is widely applied in molecular biology, protein engineering, synthetic biology, bioconjugation research, and development of fusion protein systems requiring a compact peptide linker with reliable synthetic accessibility.

Product Name: PRRVRLK acetate

Purity: 98%

Sequence: PRRVRLK

Chemical Formula: C42H81N17O10

Molar Mass: 984.20

Appearance: White to off-white Solid

Storage : Sealed storage, away from moisture and light, under nitrogen

SMILES: CC(C)C[C@@H](C(=O)N[C@@H](CCCCN)C(=O)O)NC(=O)[C@H](CCCN=C(N)N)NC(=O)[C@H](C(C)C)NC(=O)[C@H](CCCN=C(N)N)NC(=O)[C@H](CCCN=C(N)N)NC(=O)[C@@H]1CCCN1.CC(=O)O

IUPACNAME: acetic acid;(2S)-6-amino-2-[[(2S)-2-[[(2S)-5-(diaminomethylideneamino)-2-[[(2S)-2-[[(2S)-5-(diaminomethylideneamino)-2-[[(2S)-5-(diaminomethylideneamino)-2-[[(2S)-pyrrolidine-2-carbonyl]amino]pentanoyl]amino]pentanoyl]amino]-3-methylbutanoyl]amino]pentanoyl]amino]-4-methylpentanoyl]amino]hexanoic acid

INCHIKEY: SNRANHCMAAEEFT-FASWNFLUSA-N

INCHI: InChI=1S/C40H77N17O8.C2H4O2/c1-22(2)21-29(35(62)55-28(37(64)65)11-5-6-16-41)56-33(60)26(14-9-19-50-39(44)45)54-36(63)30(23(3)4)57-34(61)27(15-10-20-51-40(46)47)53-32(59)25(13-8-18-49-38(42)43)52-31(58)24-12-7-17-48-24;1-2(3)4/h22-30,48H,5-21,41H2,1-4H3,(H,52,58)(H,53,59)(H,54,63)(H,55,62)(H,56,60)(H,57,61)(H,64,65)(H4,42,43,49)(H4,44,45,50)(H4,46,47,51);1H3,(H,3,4)/t24-,25-,26-,27-,28-,29-,30-;/m0./s1

Current Research: Overview PRRVRLK acetate is a synthetic peptide linker with the amino acid sequence Pro-Arg-Arg-Val-Arg-Leu-Lys, often written as PRRVRLK. It is used in biochemical and protein engineering research as a short peptide linker for the construction of fusion proteins. Product listings describe PRRVRLK as a peptide linker that can be used to make fusion proteins, with a reported molecular weight of 924.15 and molecular formula C40H77N17O8 for the free peptide form. In modern recombinant protein design, linkers are more than simple spacers. They can influence folding, solubility, stability, domain orientation, protease accessibility, expression yield, and biological activity. Fusion protein linkers are widely studied because the direct connection of two protein domains can create steric hindrance, misfolding, reduced expression, or loss of function. Reviews of fusion protein linker design classify linkers by flexibility, rigidity, and cleavability, and emphasize that linker choice is a key variable in fusion protein performance. PRRVRLK acetate is especially relevant to research requiring a compact, basic, arginine-rich linker sequence. The sequence contains multiple positively charged residues, including three arginine residues and one lysine residue, which may contribute to aqueous compatibility and electrostatic interactions in fusion protein systems. Because the peptide is short, it may be useful in designs where researchers want to connect functional domains without adding a long flexible spacer. Role of PRRVRLK Acetate in Fusion Protein Construction Fusion proteins are engineered molecules in which two or more protein domains are genetically or chemically joined to create a multifunctional construct. These constructs are widely used in molecular biology, structural biology, cell biology, immunology, and drug discovery. Examples include tagged proteins for purification, fluorescent protein fusions for imaging, antibody fragments, cytokine fusion proteins, enzyme fusion systems, receptor-binding proteins, and targeted delivery constructs. A linker such as PRRVRLK acetate can serve as a connecting sequence between two protein domains. The main goal is to preserve the activity of each domain while allowing the whole fusion protein to fold and function properly. In many cases, a linker reduces direct steric interference between domains. In other cases, it provides a short structural or biochemical element that affects how domains are positioned relative to each other. The PRRVRLK sequence is not a long glycine-serine type linker. Instead, it is short and basic, with a distinctive pattern of arginine and lysine residues. This makes it different from commonly used flexible linkers such as repeated GGGGS motifs. Its properties may be useful for fusion protein systems where a compact positively charged linker is desired. Researchers may evaluate PRRVRLK acetate in comparative linker screening studies to determine whether it improves expression, folding, cleavage behavior, or biological function compared with alternative linker sequences. Structural Features of the PRRVRLK Sequence The sequence of PRRVRLK acetate contains seven amino acids: P – Proline R – Arginine R – Arginine V – Valine R – Arginine L – Leucine K – Lysine This composition gives PRRVRLK several notable features. First, it is rich in basic amino acids. Arginine and lysine residues are positively charged under many physiological or near-physiological conditions. This may improve water compatibility and may influence interactions with negatively charged surfaces, biomolecules, or protein regions. Second, PRRVRLK includes proline at the N-terminus. Proline is structurally distinctive because its side chain forms a ring with the backbone nitrogen, restricting backbone flexibility. In linker design, proline-containing sequences can sometimes reduce excessive flexibility and help separate domains by limiting certain backbone conformations. Reviews of linker design note that proline-rich or proline-containing linkers may show more restricted conformational behavior than highly flexible glycine-rich linkers. Third, the presence of valine and leucine introduces hydrophobic residues into the sequence. These residues may affect local structure, interaction with neighboring protein regions, or protease recognition depending on the full fusion protein context. Because linker function is highly context-dependent, PRRVRLK acetate should be evaluated experimentally in each fusion protein system rather than assumed to behave identically across all constructs. Research Interest in Peptide Linkers Peptide linkers are central components in fusion protein design. They are commonly used to connect functional molecules and are applied in fusion proteins, antibody-drug conjugate research, peptide-drug conjugates, and related biomolecular engineering systems. Current research on peptide linkers focuses on several questions. One major question is how linker length affects domain movement and steric separation. Short linkers may keep domains close together, which can be useful when proximity is required for function. However, short linkers may also create steric strain if the connected domains need more space to fold correctly. Longer flexible linkers can provide greater domain mobility, but excessive flexibility may reduce stability or increase unwanted interactions. Another major area is linker composition. Glycine-serine linkers are commonly used when flexibility and solubility are desired. Helical linkers such as EAAAK-type sequences are studied when rigid domain separation is needed. Cleavable linkers are used when researchers want functional domains to separate after exposure to a specific protease or biological condition. PRRVRLK acetate fits into this broader field as a short synthetic linker sequence that may be explored in compact fusion constructs or in systems where a basic linker region is useful. Potential Relevance to Cleavable Linker Design The PRRVRLK sequence contains several arginine residues, which makes it relevant to discussions of protease-sensitive linker motifs. Some proteases recognize basic amino acid patterns. For example, furin, a proprotein convertase, has a minimal cleavage motif described as Arg-X-X-Arg, and it often prefers Arg-X-Lys/Arg-Arg sites. PRRVRLK contains arginine-rich regions, so researchers may consider whether it has potential relevance in protease-accessible fusion protein designs. However, it is important not to overstate this point. Whether PRRVRLK functions as a cleavable linker depends on the full molecular context, including neighboring residues, protein folding, accessibility, expression system, and the specific protease environment. For SEO product copy, it is more accurate to describe PRRVRLK acetate as a peptide linker used in fusion protein construction, rather than to claim confirmed protease cleavage activity unless supported by a specific experimental reference. Cleavable linker research remains an active area in biomedicine. Cleavable linkers can allow controlled release of functional domains, activation of therapeutic proteins, or separation of targeting and effector modules. In one recent example of chimeric peptide research, a cleavable linker was used to connect functional peptide domains and compared with rigid and flexible non-cleavable linkers, highlighting how linker selection can influence biological performance. Applications in Fusion Protein Research PRRVRLK acetate may be used in research involving the design and production of fusion proteins. Potential research applications include: Protein domain connection: PRRVRLK acetate can be used as a linker sequence to connect two functional domains in a recombinant protein or synthetic construct. Fusion protein optimization: Researchers may compare PRRVRLK with other linker sequences to evaluate effects on expression, folding, solubility, and activity. Targeted protein engineering: Short peptide linkers can be useful in multifunctional constructs where a targeting domain is connected to an active domain. Biochemical assay development: Fusion proteins containing peptide linkers may be used in binding assays, enzymatic assays, reporter systems, or cell-based experiments. Structure-function studies: By changing linker sequence or length, researchers can investigate how domain spacing affects protein behavior. In these applications, the performance of PRRVRLK acetate should be assessed through standard experimental methods such as SDS-PAGE, Western blotting, mass spectrometry, circular dichroism, activity assays, binding assays, and stability testing. Why Linker Selection Matters The choice of linker can strongly influence the success of a fusion protein. A poorly selected linker may cause misfolding, aggregation, steric interference, low expression yield, reduced binding affinity, or loss of biological activity. In contrast, an optimized linker can help maintain independent domain folding, improve protein solubility, support correct domain orientation, and preserve function. Reviews of fusion protein linkers describe several benefits of optimized linker design, including improved structural stability, enhanced biological activity, increased expression level, altered pharmacokinetic behavior, and targeted release or activation in specific biological environments. For this reason, PRRVRLK acetate may be valuable as one candidate in linker screening workflows. Researchers developing a fusion protein often test several linker types, including short linkers, flexible glycine-serine linkers, rigid helical linkers, and protease-sensitive linkers. PRRVRLK acetate offers a compact, basic peptide sequence that may provide different behavior from neutral flexible linkers. Research Considerations When using PRRVRLK acetate in fusion protein design, researchers should consider the following factors: First, linker length is important. PRRVRLK contains only seven amino acids, making it relatively short. It may be suitable when domains can tolerate close spacing, but it may not provide enough distance for large domains requiring substantial conformational freedom. Second, charge distribution should be evaluated. The arginine and lysine residues introduce positive charge, which may affect protein solubility, purification behavior, binding properties, or local folding. Third, context determines function. The same linker may behave differently depending on the domains it connects, the expression system used, and the intended assay conditions. Fourth, cleavage potential should be experimentally validated. Although the sequence is arginine-rich, protease sensitivity cannot be assumed without direct testing. Finally, analytical confirmation is essential. Fusion proteins incorporating PRRVRLK should be verified for sequence accuracy, molecular weight, purity, stability, and functional activity. Future Research Directions As fusion protein engineering continues to expand, demand for diverse peptide linkers is increasing. Current research is moving beyond standard empirical linker selection toward more rational and computationally guided design. Machine learning, structural modeling, molecular dynamics, and high-throughput screening are being used to predict how linkers affect fusion protein architecture and function. In this context, PRRVRLK acetate may be useful as a compact linker candidate in comparative design studies. Its short length, basic residue content, and distinctive sequence composition make it suitable for exploration in fusion proteins where researchers want to test non-GS linker behavior. Future studies may examine how PRRVRLK affects protein expression, solubility, folding, domain accessibility, protease sensitivity, and biological activity across different fusion protein platforms. Conclusion PRRVRLK acetate is a synthetic peptide linker used in fusion protein research. With the sequence PRRVRLK, it provides a short, arginine-rich, lysine-containing linker option for connecting functional protein domains. Linker design is a critical factor in fusion protein engineering because it can influence folding, stability, expression, activity, and domain independence. While PRRVRLK acetate is best described as a peptide linker for fusion protein construction, its basic sequence composition may make it an interesting candidate for specialized linker screening and protein engineering studies. As research in fusion proteins, targeted biologics, and multifunctional peptide systems continues to grow, peptide linkers such as PRRVRLK acetate will remain useful tools for designing and optimizing next-generation biomolecular constructs.

Reference: Loew, A. (2024). U.S. Patent Application No. 18/251,848.