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 Arginylglycylaspartic 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 struct Among these RGD peptides, cyclic peptides c(RGDfK) and c(RGDyK), RGD4C, and RGD10 (Figure 1) showed high binding affinity and selectivity for integrin αvβ3 [50] ural 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 con Cyclo (RGDfK) (CAS 161552-03-0) formation 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 scaffo by TG Kapp · 2017 · Cited by 733 — This study includes RGD-based linear and cyclic peptides, peptide-mimetics as well as commonly used reference compounds. (RGDfK ) < c(RGDyK ) < lds are frequently utilized to assess cell viability and the promotion of angiogenesis in controlled environments. These scaffolds 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 preparation of multicellular tumor spheroids (MTS). These 3D in vitro models provide a more accurate representation of biological complexity than traditional 2D cultures.
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 by A Del Gatto · 2011 · Cited by 15 — The cyclic pentapeptide c(RGDfK) is a high affinity ligand of alphaVbeta3 integrin. It was an analog of Cilengitide (EMD 121974) developed 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(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 ar Solid-phase synthesis of c(RGDfK) derivatives: on-resin e 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 a more complex synthetic peptide that has the amino acid sequence: RGD-(D)Phe-C, purity levels exceedin Cyclo(-RGDfK) potently targets tumor microvasculature and cancer cells through the specific binding to the αvβ3 integrin on the cell surface. For research use g 98% are the industry standard. Investigators often utilize NMR and HPLC to verify the inte 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. grity 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 diagnostic tools.
Conclusion
The RGDfK peptide remains a cornerstone of modern biochemical investigation. Its ability to facilitate precise cell adhesion, combined 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 p Investigation of the Best Conditions to Obtain c(RGDfK ossible 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.