Gln-Gln pairs two glutamine residues offering strong hydrogen-bonding potential and conformational adaptability. Researchers analyze its behavior across pH conditions to study amide-mediated interactions. The dipeptide serves as a model for polar side-chain contributions. Applications include folding studies, enzymatic recognition research, and peptide assembly design.
CAT No: R2351
CAS No:54419-93-1
Synonyms/Alias:H-Gln-Gln-OH;Gln-Gln;54419-93-1;L-GLUTAMINYL-L-GLUTAMINE;glutaminylglutamine;Glutaminyl-Glutamine;QQ dipeptide;Q-Q Dipeptide;CHEBI:73846;Glutamine Glutamine dipeptide;Glutamine-Glutamine dipeptide;CHEMBL438960;(2S)-5-amino-2-[[(2S)-2,5-diamino-5-oxopentanoyl]amino]-5-oxopentanoic acid;(S)-5-Amino-2-((S)-2,5-diamino-5-oxopentanamido)-5-oxopentanoic acid;MFCD00038689;L-Gln-L-Gln;N2-Glutaminylglutamine;H-L-Gln-L-Gln-OH;SCHEMBL19375;N2-L-Glutaminyl-L-glutamine;DTXSID001313028;QQ;BDBM50188528;Q27144168;
Gln-Gln, also known as L-Glutaminyl-L-glutamine, is a synthetic dipeptide composed of two glutamine residues linked via a peptide bond. As a member of the peptide compound category, it serves as a valuable biochemical tool for investigating peptide structure-function relationships, enzymatic specificity, and metabolic processing in various biological systems. Its unique composition, featuring two amide side chains, offers distinct physicochemical properties that are of particular interest in peptide chemistry and amino acid metabolism research. Gln-Gln's stability and solubility profile make it an attractive substrate or model compound for a range of experimental applications in molecular biology, enzymology, and analytical biochemistry.
Peptide metabolism studies: Gln-Gln is widely utilized as a model substrate for examining the activity and specificity of peptidases, particularly those involved in the hydrolysis of dipeptides containing glutamine residues. By monitoring its enzymatic cleavage, researchers can gain insights into the mechanisms and kinetics of peptide bond hydrolysis, which is fundamental for understanding protein catabolism and nitrogen cycling within cells. Such studies are essential for elucidating the roles of specific enzymes in metabolic pathways and for screening potential peptidase inhibitors.
Transporter characterization: The dipeptide is frequently employed in investigations of peptide transporter systems, such as the proton-coupled oligopeptide transporters (PepTs) expressed in various cell types. Its structural simplicity and defined composition facilitate precise studies of substrate recognition, affinity, and uptake kinetics. These experiments contribute to the broader understanding of nutrient absorption, cellular uptake mechanisms, and the molecular determinants governing transporter selectivity for dipeptides versus free amino acids.
Peptide synthesis validation: In synthetic peptide chemistry, Gln-Gln serves as a reference compound for optimizing and validating solid-phase peptide synthesis protocols. Its known sequence and reactivity profile allow chemists to assess coupling efficiency, side-chain protection strategies, and cleavage conditions. Analytical evaluation of synthesized Gln-Gln can help refine purification processes and improve overall synthetic yields, supporting the advancement of peptide manufacturing technologies.
Analytical method development: The well-defined nature of this dipeptide makes it a suitable standard in the development and calibration of chromatographic or mass spectrometric methods for peptide analysis. It is often used to optimize detection parameters, retention times, and fragmentation patterns, thereby enhancing the accuracy and reproducibility of peptide quantification in complex biological samples. Such methodological advancements are critical for high-throughput proteomics, metabolomics, and quality control applications.
Structural-functional studies: Gln-Gln provides a model system for probing the influence of glutamine-rich motifs on peptide conformation and intermolecular interactions. By incorporating this dipeptide into larger peptide sequences or studying it in isolation, researchers can investigate the role of glutamine side chains in hydrogen bonding networks, aggregation tendencies, and secondary structure formation. Findings from these studies inform the design of novel peptides with tailored properties for research or industrial applications, and deepen our understanding of protein folding and misfolding phenomena.
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