Peptide–Affinity Tag Conjugates

Peptide–affinity tag conjugates are non-drug peptide conjugates in which a peptide is covalently linked to a small-molecule tag that enables selective capture, enrichment, immobilization, or detection in research workflows. These constructs are widely used in pull-down assays, interaction studies, surface immobilization, and assay development where reproducible binding and low background are important. ^{[1], [2]}

Bio-Synthesis builds chemically defined peptide–affinity tag conjugates using site-defined attachment (N-/C-terminus, single-Cys, or handle-enabled options; project-dependent), with purification and fit-for-purpose analytical confirmation to support research-stage and preclinical programs.

The most common platform is biotinylation (biotin–streptavidin/avidin systems), but alternative tags—such as desthiobiotin (reversible capture), digoxigenin (DIG) (antibody-based detection), or hapten tags like DNP—may be selected based on assay format and downstream handling needs. ^{[1], [3]}

Successful affinity tagging typically depends on site-defined attachment (e.g., N-terminus, C-terminus, a single engineered Cys, or a dedicated handle; project-dependent) and appropriate spacer design (e.g., PEG spacers) to reduce steric interference and preserve peptide binding/structure. ^[4]

Related: Non-drug peptide–ligand conjugates · Peptide–fluorophore conjugates

These services are commonly paired with peptide–affinity tag conjugates to support peptide build, orthogonal labeling, and downstream workflows.

Bio-Synthesis follows controlled workflows and quality practices aligned with Total Quality Management (TQM). For affinity-tagged peptides, emphasis is placed on attachment-site control, spacer selection, purification strategy, and fit-for-purpose analytical confirmation to support research-stage reproducibility.

• Purity profiling: analytical HPLC/UPLC
• Identity confirmation: LC–MS when feasible
• Reproducibility: site-defined attachment to reduce heterogeneity
• Documentation: COA and method summary aligned to intended use

For the fastest quote on peptide–affinity tag conjugation services, share your peptide sequence(s), the desired tag (biotin/desthiobiotin/DIG/DNP), preferred attachment site/constraints, spacer preference (if any), and quantity/purity targets.

Peer-reviewed references for affinity capture systems and site-selective bioconjugation concepts (included for scientific context; not clinical claims).

• Wilchek, M.; Bayer, E. A. The avidin–biotin complex in bioanalytical applications. Anal. Biochem. 1988. DOI
• Green, N. M. Avidin and streptavidin. Methods Enzymol. 1990. DOI
• Hermanson, G. T. Bioconjugate Techniques, 3rd ed.; Academic Press, 2013. (biotin/DIG/hapten labeling methods overview)
• Hoyt, E. A.; Cal, P. M. S. D.; Oliveira, B. L.; Bernardes, G. J. L. Contemporary approaches to site-selective protein and peptide bioconjugation. Nat. Rev. Chem. 2019, 3, 147–171. DOI