Cyclo-[GRGESP]

Product Name: Cyclo-[GRGESP]

Sequence One Letter Code: Cyclo-[GRGESP]

Sequence Three Letter Code: Cyclo-H-Gly-Arg-Gly-Glu-Ser-Pro-OH

Chemical Formula:C23H37N9O9

Molecular Weight: 583.6 Purity: 95% Form: Lyophilized

Storage Conditions: - 20 °C

Research Area: Cardiovascular Disease Research

Source / Species: synthetic

Conjugation: Unconjugated

Code Nacres: NA.26

Application: Cyclo-[GRGESP] is a cyclic control peptide widely used in studies of integrin-mediated signaling and vascular biology. It serves as a negative control for GRGDSP, a well-known RGD-containing peptide with strong receptor-binding and vasodilatory activity. Unlike GRGDSP, Cyclo-[GRGESP] lacks the functional RGDS motif required for integrin interaction. In complement-mediated phagocytosis studies, it does not inhibit uptake of complement-coated erythrocytes, confirming the specificity of RGD-dependent binding. This distinction highlights the critical role of integrin recognition sequences in receptor–ligand interactions. Cyclo-[GRGESP] is commonly applied in experimental models to validate specificity, differentiate nonspecific effects, and support accurate interpretation of integrin-related signaling, adhesion, and cell interaction studies.

Current Research: Integrin-mediated signaling plays a central role in cell adhesion, migration, and communication with the extracellular matrix. To accurately study these processes, researchers often rely on well-characterized peptide ligands and appropriate control molecules. Cyclo-[GRGESP] is a cyclic control peptide widely used in integrin research, particularly as a negative control for RGD-containing peptides such as GRGDSP, which are known for their strong integrin-binding and biological activity. By lacking the functional RGDS motif, Cyclo-[GRGESP] provides a critical reference point for distinguishing specific integrin-dependent effects from nonspecific interactions, making it an essential tool in vascular biology, cell adhesion studies, and receptor signaling research. Integrins and the RGD Recognition Motif Integrins are transmembrane receptors that mediate interactions between cells and the extracellular matrix (ECM). These receptors recognize specific amino acid sequences within ECM proteins, with the arginine–glycine–aspartic acid (RGD) motif being one of the most important and widely studied binding sequences. Peptides containing the RGD motif, such as GRGDSP, can bind to integrins and modulate cellular processes including: Cell adhesion and spreading Migration and invasion Angiogenesis and vascular function Signal transduction pathways linked to survival and proliferation Because of these effects, RGD peptides are commonly used to probe integrin function and receptor–ligand interactions. Structural Features of Cyclo-[GRGESP] Cyclo-[GRGESP] is a cyclic peptide, meaning its amino acid chain is constrained into a ring structure. Cyclization enhances peptide stability and can influence conformational properties, making it useful in controlled experimental comparisons. Importantly, this peptide contains the sequence GRGESP, which differs from the active GRGDSP peptide by substitution of the aspartic acid (D) with glutamic acid (E). This seemingly small change disrupts the canonical RGDS motif required for integrin binding, rendering the peptide biologically inactive in terms of integrin recognition. As a result, Cyclo-[GRGESP] does not engage integrin receptors and does not trigger downstream signaling events associated with RGD-dependent interactions. Role as a Negative Control in Integrin Studies A key application of Cyclo-[GRGESP] is its use as a negative control peptide in experiments involving RGD-mediated binding. By comparing results obtained with active RGD peptides and the inactive control, researchers can confirm whether observed biological effects are specifically mediated through integrin interactions. For example, in studies of complement-mediated phagocytosis, RGD-containing peptides can inhibit the uptake of complement-coated erythrocytes by interfering with integrin-dependent binding. In contrast, Cyclo-[GRGESP] does not inhibit this process, demonstrating that the effect is specifically dependent on the presence of the functional RGD motif. This distinction provides strong evidence for the specificity of receptor–ligand interactions and helps eliminate confounding variables in experimental systems. Applications in Vascular Biology and Cell Adhesion Research Cyclo-[GRGESP] is widely used in research areas where integrin signaling plays a critical role. Its primary function is to serve as a control that validates the specificity of experimental observations. Common applications include: Integrin-binding assays comparing active and inactive peptide interactions Cell adhesion and migration studies to distinguish RGD-dependent effects Angiogenesis and vascular function research Phagocytosis and immune cell interaction studies Receptor signaling experiments involving extracellular matrix interactions By including Cyclo-[GRGESP] in experimental designs, researchers can ensure that observed cellular responses are not due to nonspecific peptide effects. Supporting Accurate Interpretation of Experimental Data In complex biological systems, distinguishing between specific and nonspecific interactions is essential for drawing reliable conclusions. Cyclo-[GRGESP] plays a crucial role in this process by providing a structurally similar but functionally inactive counterpart to active RGD peptides. This allows researchers to: Validate integrin-dependent mechanisms Control for peptide-related artifacts Improve reproducibility and experimental rigor Strengthen conclusions regarding receptor specificity Such controls are especially important in studies involving signaling pathways, where unintended interactions can lead to misleading interpretations. A Reliable Tool for Integrin and ECM Research Cyclo-[GRGESP] remains an indispensable reagent in studies of integrin biology and extracellular matrix interactions. By lacking the functional RGDS motif required for receptor binding, it serves as an effective negative control that helps clarify the role of integrins in cellular processes. Through its application in cell adhesion, vascular biology, immune response studies, and receptor signaling research, Cyclo-[GRGESP] supports accurate and reproducible investigation of integrin-mediated mechanisms, ensuring that experimental findings reflect true biological specificity rather than nonspecific effects.