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Protein Modification & Conjugation Services

Custom protein modification and conjugation services for recombinant proteins, including fluorescent labeling, biotinylation, enzyme conjugation, PEGylation, protein-antibody conjugation, protein-oligonucleotide conjugation, protein-liposome conjugation, and advanced bioconjugation development for research, diagnostic, and therapeutic workflows.

Fluorescent labeling Biotinylation Enzyme conjugation PEGylation Click chemistry Custom conjugation development
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Overview Capabilities Representative Labels, Conjugates & Formats Conjugation Chemistry Analysis Methods What You Receive Applications Related Services FAQ Contact

Protein Modification & Conjugation Overview

Protein modification and conjugation make it possible to tailor recombinant proteins for detection, imaging, quantification, targeting, delivery, and assay development. By attaching functional groups such as fluorescent dyes, biotin, enzymes, PEG, nanoparticles, oligonucleotides, antibodies, or other reactive partners, proteins can be transformed into application-ready materials with broader research and development utility.

Our platform supports both routine labeling workflows and advanced multi-component bioconjugation strategies. Chemistry is selected according to protein properties, accessible reactive groups, intended application, and the need to preserve activity, binding behavior, and overall protein integrity.

Projects can begin from customer-supplied protein or be integrated with upstream recombinant protein expression and protein purification services to create a streamlined path from production to final functionalized product.

Research-ready proteins Routine to advanced conjugation Standalone or integrated workflow QC-supported output
Protein modification and conjugation workflow
Workflow goal: Deliver a clean, functionalized protein with reliable labeling or conjugation performance and suitability for downstream use.

Capability range

Routine to advanced

Support from standard labeling through complex bioconjugation design

Chemistry options

Multiple routes

Amine, thiol, carboxyl, click, and crosslinker-based strategies

Project format

Standalone or integrated

Can start from purified material or broader gene-to-protein workflows

Quality focus

QC included

Protein quality, conjugation outcome, and analytical review supported

Flexible project entry points: We can start from customer-supplied protein, purified recombinant material, antibody targets, or a broader upstream workflow depending on your project needs.

Protein Modification & Conjugation Capabilities

Protein / Peptide Crosslinking

Homobifunctional and heterobifunctional crosslinking strategies for protein-protein and protein-peptide interactions, stability enhancement, and structural studies.

Protein & Enzyme Labeling

Custom protein labeling including reporter-enzyme conjugation for detection, ELISA, immunoassays, and assay development workflows.

Fluorescent Labeling

Fluorescent dye conjugation using FITC, Alexa Fluor dyes, Cy dyes, near-IR dyes, and related fluorophores for imaging, tracking, and analytical applications.

Biotin Labeling

Biotinylation using NHS, sulfo-NHS, maleimide, and related reagents for streptavidin-based detection, capture, immobilization, and assay development.

Gold Nanoparticle & Glycoprotein Conjugation

Protein and glycoprotein conjugation to nanoparticles for lateral flow assays, biosensors, imaging, and signal amplification applications.

PEGylation & Polymer Functionalization

PEGylation and polymer conjugation to improve protein stability, solubility, formulation behavior, and functional performance.

Protein-Drug Conjugation

Attachment of small-molecule payloads using linker-based strategies for targeting, functional screening, and therapeutic research applications.

Protein-Antibody Conjugation

Generation of multifunctional protein-antibody conjugates for targeting, binding studies, immunoassays, and specialized development workflows.

Protein-Oligonucleotide Conjugation

DNA- and RNA-protein conjugation for molecular detection, barcode strategies, targeted delivery concepts, and assay development.

Protein-Liposome Conjugation

Surface conjugation of proteins to liposomes for delivery, targeting, membrane interaction studies, and formulation development.

Advanced Protein-Polymer Conjugates

Advanced polymer-protein conjugation strategies for structural enhancement, custom functionality, and application-specific performance needs.

Custom Conjugation Development

Tailored conjugation strategies designed for complex proteins, novel linker designs, controlled labeling requirements, and unique end-use goals.

Comprehensive capability: From routine labeling to advanced multi-component bioconjugation, workflows are designed to match protein structure, application requirements, and performance goals.

Representative Labels, Conjugates & Formats

Category Representative Formats / Reagents Typical Applications
Fluorescent Dyes FITC, TRITC, Alexa Fluor dyes, Cy dyes, DyLight dyes, Texas Red, near-infrared dyes Imaging, flow cytometry, localization studies, and fluorescence-based assays
Biotin NHS-biotin, Sulfo-NHS-biotin, Maleimide-biotin, long-arm biotin derivatives, cleavable biotin reagents ELISA, pull-down assays, streptavidin-based capture, and detection workflows
Enzymes HRP, alkaline phosphatase, beta-galactosidase, glucose oxidase ELISA, immunoassays, blotting, colorimetric detection, and chemiluminescent workflows
Nanoparticle Conjugates Colloidal gold nanoparticles, nanogold labels, gold nanoparticle-protein conjugates Lateral flow assays, biosensors, imaging, and signal amplification
Protein-Drug or Small-Molecule Conjugation Small-molecule payloads, linker-based attachment, cleavable and non-cleavable conjugation strategies Targeted delivery studies, functional screening, and therapeutic research applications
Protein-Peptide Conjugation Functional peptides, targeting peptides, cell-penetrating peptides, epitope peptides Targeting studies, intracellular delivery research, and assay development
Protein-Antibody Conjugation Protein-antibody conjugates, antibody fragment conjugation, labeled immunoconjugates Immunoassays, targeting studies, binding analysis, and detection workflows
Protein-Oligonucleotide Conjugation DNA- or RNA-linked proteins, barcode conjugates, hybrid detection constructs Molecular detection, targeted delivery concepts, and specialty analytical workflows
Protein-Liposome Conjugation Surface-linked proteins, ligand-decorated liposomes, functionalized liposomal systems Targeted delivery, membrane interaction studies, and formulation research
Protein-Polymer Conjugation PEGylation, linear and branched polymers, azide tags, alkyne tags, affinity handles, linker-modified reagents Stability improvement, solubility enhancement, click chemistry workflows, and custom functionalization
Technical reference: This section highlights representative reagent classes, conjugate formats, and common end uses. Final design is selected based on protein structure, reaction compatibility, analytical needs, and downstream application goals.

Conjugation Chemistry

Amine-Reactive Chemistry

  • NHS ester chemistry
  • Sulfo-NHS ester chemistry
  • Isothiocyanate chemistry
  • Targets lysine residues and protein N-termini

Thiol-Reactive Chemistry

  • Maleimide chemistry
  • Iodoacetamide chemistry
  • Pyridyl disulfide-based coupling
  • Targets accessible cysteine residues

Carboxyl-Reactive Chemistry

  • EDC coupling
  • EDC/NHS activation
  • Amide bond formation with amine-containing partners
  • Useful for carboxyl-to-amine conjugation workflows

Click Chemistry

  • Azide-alkyne cycloaddition
  • Copper-free click chemistry
  • Bioorthogonal ligation strategies
  • Highly selective for specialty functionalization

Crosslinker Strategies

  • Homobifunctional crosslinkers
  • Heterobifunctional crosslinkers
  • Spacer-arm and linker-length optimization
  • Supports protein-protein and protein-ligand conjugation

Site-Directed Options

  • Engineered cysteine or tag-based approaches
  • Controlled labeling for improved uniformity
  • Reduced heterogeneity when required
  • Application-dependent customization available
Chemistry selection matters: Conjugation chemistry is chosen based on protein structure, label type, target residue accessibility, desired labeling density, and the need to preserve activity or binding performance.

Analysis Methods

Attribute Typical Method Purpose
Protein Purity SDS-PAGE Verifies purity and molecular weight before and after conjugation
Degree of Labeling UV-Vis spectroscopy Measures dye-to-protein ratio or conjugation level
Fluorescent Signal Fluorescence measurement Confirms fluorescence-based labeling performance
Enzyme Activity Activity assay Confirms performance of enzyme-conjugated proteins
Mass Confirmation Mass spectrometry (optional) Supports detailed molecular characterization
Analytical focus: The QC package depends on the label and intended use, but protein integrity, conjugation efficiency, and downstream functionality are core evaluation parameters.

What You Receive

Labeled or Conjugated Protein

Functionalized protein prepared for immediate use in detection, imaging, targeting, or assay workflows.

Conjugation Ratio or Labeling Data

Documentation of degree of labeling, conjugation ratio, or related quantitative characterization when applicable.

Purity and QC Information

Supporting analytical data for protein quality, conjugation outcome, and formulation suitability.

Optimized Buffer Format

Delivered in a buffer selected to support product stability and downstream use requirements.

Handling Guidance

Recommendations for storage, handling, and product care to maintain performance after delivery.

Project Documentation

Clear summary of labeling chemistry, conjugation workflow, and analytical review for reproducibility and reference.

Deliverable focus: Products are supplied as ready-to-use labeled or conjugated proteins for immediate downstream application.

Applications

Imaging and Localization

Fluorescently labeled proteins for microscopy, cell tracking, and localization studies.

Diagnostics and Assays

Biotinylated, enzyme-conjugated, and nanoparticle-linked proteins for ELISA, lateral flow, blotting, and assay development.

Binding, Targeting, and Delivery

Advanced protein conjugates for interaction analysis, targeted delivery concepts, and specialized research applications.

FAQ

Can you work with customer-supplied proteins?

Yes. Projects can begin from purified customer-supplied protein or be integrated into a broader upstream workflow.

Do you support both simple labeling and advanced conjugation?

Yes. We support routine labeling, biotinylation, PEGylation, and more complex multi-component conjugation development depending on the project.

How do you choose the conjugation chemistry?

Chemistry is selected based on protein structure, available reactive groups, labeling goals, stability considerations, and downstream application requirements.

Is site-specific or controlled conjugation available?

Controlled or site-directed approaches may be supported depending on the protein format, target residue accessibility, and project requirements.

How do you confirm successful labeling or conjugation?

Typical methods include SDS-PAGE, UV-Vis analysis, fluorescence measurement, activity assays, and optional mass spectrometry depending on the conjugate type.

What information is needed for a quote?

Please provide protein identity, starting material, desired label or conjugate, target application, scale, and any preferred analytical characterization.

More FAQ'sAll FAQ's

Contact & Quote Request

For the fastest and most accurate quote, include protein identity, starting material type, desired modification or conjugation type, target application, and any purification or analytical requirements.

What to include

  • Protein identity and source
  • Desired label, linker, or conjugation type
  • Target application and detection method
  • Scale and preferred analytical characterization

Fastest path

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Greetings Researchers,

Please be advised that any information, guidelines, writeups, and oral/video/graphic content on our website are intended solely as general guidelines.
It is the researcher's sole responsibility to conduct thorough research on the designs of the products intended for their experiments before submitting
their designs to Biosynthesis for review of production feasibility.
Thank you for your understanding.

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