In the specialized field of biochemical research, the RGDfK peptide—specifically the cyclic variant known as c(RGDfK)—has emerged as a foundational tool for investigators studying cellular interactions. As an enthusiast of peptide synthesis and molecular biology, I have closely followed the evolution of this molecule, which serves as a highly selective ligand for the $\alpha_v\beta_3$ integrin receptor.
Understanding the RGDfK Peptide Framework
The cyclic pentapeptide c(RGDfK) is a sophisticated structural analog derived from the classic Arginylglycylas F-Fluoroglucosylation of peptides, exemplified on cyclo( partic acid (RGD) motif. The RGD sequence is widely recognized as the most common peptide motif responsible for cell adhesion to the extracellular matrix (ECM). By cyclizing this sequence with D-phenylalanine and lysine, researchers have created a molecule that exhibits significantly higher binding affinity than its linear counterparts.
From a technical perspective, the Cyclic RGDFK peptide possesses a molecular weight of 603.7 g/mol and a chemical formula of $C_{27}H_{41}N_9O_7$. Its structural rigidity is critical; when we compare the chemical structure of the synthetic cyclic RGD peptide c(RGDfK) to linear sequences, the cyclic form prevents enzymatic degradation and maintains a conformation that perfectly mimics cell-adhesive proteins.
Research Applications and Material Science
My interest in this molecule stems from its versatility in material science. For instance, purified cyclic RGDfK peptide-modified 3D alginate scaffolds are frequently utilized to assess cell viability and the promotion of angiogenesis in controlled environments. These scaf A Comprehensive Evaluation of the Activity and Selectivity folds demonstrate how a simple peptide can be used for directing association of various cell types with diverse biomaterials.
Furthermore, specialized derivatives like Cyclo-[RGDfK(TPP)] (LS-3920) are essential for the c(RGDfK) was used as a standard. 3P-RGK2 was the dimeric nonsense peptide to demonstrate the RGD-specificity of FITC-conjugated cyclic RGD peptides. preparation of multicellular tumor spheroids (MTS). These 3D in vitro models provide a more accurate representation of biological complexity than traditional 2D cu Cyclo[RGDfK(Azide)] ltures.
Selectivity and Receptor Binding
The primary reason Cyclo(-RGDfK) is a staple in high-end laboratory settings is its potency. It is documented that Cyclo(-RGDfK) potently targets tumor microvasculature and cancer cells through specific binding to the $\alpha_v\beta_3$ integrin. In my review of current literature, I have noted that while researchers look at bicyclic RGD peptides for even higher selectivity, the standard c by G Mondal · 2013 · Cited by 60 — We show that a lipopeptide containing widely acclaimed αvβ3 integrin receptor selective cyclic RGDfK ligand in its head-group area can effectively deliver (RGDfK) remains the benchmark for consistency.
It is worth noting that RGD sequences are commonly seen in cell adhesive proteins, which is why synthetic variants are so effective at mimicking natural biological processes. While some might confuse these with Gramicidin S—a cationic cyclic peptide antibiotic—it is important to distinguish that RGD-based compounds are primarily structural ligands rather than membrane-disrupting agents.
Observations on Synthesis and Quality
When sourcing these materials for research, quality control is paramount. Whether you are investigating RGD (Arg-Gly-Asp) Peptides or c(RGDfK) was used as a standard. 3P-RGK2 was the dimeric nonsense peptide to demonstrate the RGD-specificity of FITC-conjugated cyclic RGD peptides. a more complex synthetic peptide that has the amino acid sequence: RGD-(D)Phe-C, purity levels exceeding 98% are the industry standard. Investigators often utilize NMR and HPLC to verify the integrity of the cyclic structure.
The Cyclo(-RGDfK)の価格 (market price) and availability often fluctuate based on the conjugation method—such as biotinylation or fluorophore tagging—which are common modifications used to turn these peptides into fluorescent probes or dia Cyclo(-RGDfK)の価格 ; M.W.：603.67，化学式：C27H41N9O7，純度：>98%，溶解性：DMSO: ≥ 150 mg/mL. CAS No：161552-03-0 別名：Cyclo(RGDfK) peptide，Cyclic RGDfK peptide. gnostic tools.
Conclusion
The RGDfK peptide remains a cornerstone of modern biochemical investigation. Its ability to facilitate precise cell adhesion, co F-Fluoroglucosylation of peptides, exemplified on cyclo( mbined with its high affinity for integrin receptors, makes it an indispensable asset. Whether utilized in the development of advanced scaffolds or as a targeted delivery vehicle, the structural precision of this cyclic pentapeptide continues to push the boundaries of what is possible in laboratory research. Always ensure that your supply is sourced from reputable entities that provide rigorous analytical documentation to ensure the validity of your experimental outcomes.