Peptide Modification Services
Creative Peptides offers hundreds of peptide modifications to meet any research need. These modifications can improve the overall stability of peptide, change the structure to better understand biological functions, or enhance the immunogenicity of antibody development and production. Our exceptional quality and reliability scientists ensure that the most appropriate methods and techniques are selected for each peptide project.
Below is a list of our available modifications (include but not limited to the following):
- Peptide N-Terminal Modification
- Peptide C-Terminal Modification
- Unusual & Non-natural Amino Acids Modification
- Peptide PEGylation
- Fluorescent Dye/FRET Pairs Modification
- Post-translational Modification
- Cyclic Peptides
- Custom Labeling
- Custom Conjugation Service
- Peptide Tags
- Biotinylated Peptides
- Peptide Dimers
Peptides can be modified at the N terminus. In general, some standard peptide moieties must be accessible in order to be modified: an N-terminal amino group, the amino group of Lys, the thiol group of Cys, the hydroxyl groups of Ser, Thr, and Tyr. These modifications might increase the biological activity of a peptide and prevent degradation by enzymes.
The C-terminal of the peptide is synthesized as an amide to neutralize negative charge created by the C-terminal COOH. This modification is added to prevent enzyme degradation, to mimic native proteins, and in some cases to remove hydrogen bonding at the C-terminal of the peptides which may interfere with the assays.
The introduction of non-natural amino acids generates modifications in the secondary and tertiary structures of a peptide, and is used to further enhance the stability and activity of peptide sequences.
For PEG peptides, the PEG is usually attached to the peptide using standard amide bond formation but other linkage chemistry is possible as well (e.g. thiol-maleimide, oxime ligation, click chemistry). PEGylating your peptide may overcome many of the challenges for peptide drug candidates.
Fluorescence and dye labeled peptides have been developed for in vivo biomedical imaging, protein binding and localization studies. The large number of commercially available ﬂuorophores, many of them in the form of activated species ready for derivatization, has simpliﬁed the synthetic eﬀort required to obtain the modiﬁed peptides and increased the ﬂexibility of the designs.
Protein post-translational modifications (PTMs) are important in the study of biology and disease prevention and treatment, which can increase the functional diversity of the proteome by the covalent addition of functional groups or proteins, proteolytic cleavage of regulatory subunits, or degradation of entire proteins.
Disulfide-rich cyclic peptides and their disulfide bonds often have exciting potential as leads or frameworks in drug discovery. It can improve the potency, rigidity, target selectivity, and stability of proteases and stabilize the secondary structure of peptides.
We can create the best custom labels for all your needs just about any custom labeling system that your operation requires. Throughout the years, Creative Peptides has created many custom solutions that have become a standard in our industry.
Peptides are often not sufficiently immunogenic to elicit an immune response alone. Synthetic peptides (1,000–3,000 Da), which are widely used to generate antibodies that can be made immunogenic by conjugation to a suitable carrier.
Protein and peptide (epitope) tags are widely used in protein purification and protein detection. Protein tags refer to those with more than a dozen of amino acids, for example, green fluorescent protein; peptide tags and epitope tags are used interchangeably, referring to the likes of FLAG, Myc epitope, and poly-histidine.
Biotinylated peptides are very useful in immunoassay studies, such as attaching peptides to avidin-coated microtitration plates. In the solid-phase synthesis of Fmoc, biotin can be connected to the N-terminal of the peptide or to the side chain of lysine (Lys) or glutamate (Glu).
Peptide dimer is a polymer complex formed by two peptide monomers or a single peptide (usually non-covalently bound). Peptide dimers or polymers have many advantages over their monomer counterparts. For example it is known that the dimerization of GPCR ligands can lead to a significant increase in affinity.
- Highly skilled and committed scientific staff
- A full range of modification services
- Superior technical support
- In quantities of several milligrams up to 100 grams
- Quality assurance: HPLC chromatogram and Mass spec analysis
- Additional analyses, such as stability determination, amino acid analysis, and residual solvents etc.
1. Letzel, T. (Ed.). (2011). Protein and Peptide Analysis by LC-MS: Experimental Strategies (No. 15). Royal Society of Chemistry.
2. Olsen, J. V., Macek, B., Lange, O., Makarov, A., Horning, S., & Mann, M. (2007). Higher-energy C-trap dissociation for peptide modification analysis. Nature methods, 4(9), 709.
3. Sewald, N., Hollweck, W., Mütze, K., Schierlinger, C., Seymour, L. C., Gaa, K.& Jakubke, H. D. (1995). Peptide modification by introduction of α-trifluoromethyl substituted amino acids. Amino Acids, 8(2), 187-194.