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Post-Translationally Modified (PTM) Peptides

Custom PTM peptides with precisely defined modification sites for cell signaling, epigenetics, immunology, proteomics, biomarker research, and assay development. Explore major PTM families, compare biological roles, and select the right synthetic peptide model for your research.

Phosphorylation
Glycosylation
Acetylation
Methylation
Sulfation
Citrullination
Ubiquitination
SUMOylation
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Overview PTM Families Biological Functions Selection Guide Comparison Workflow Related Services FAQ Contact
Scientific Overview

From cellular regulation to precisely defined synthetic peptide models

Post-translational modifications are chemical or protein-based changes introduced after translation. They can alter protein activity, conformation, localization, stability, molecular recognition, and interactions with enzymes, receptors, antibodies, or other binding partners.

Because native proteins may contain heterogeneous or dynamically changing PTM patterns, synthetic PTM peptides provide controlled molecular tools with a defined sequence, modification site, and stoichiometry. These peptides support mechanistic studies, antibody generation, enzyme assays, quantitative mass spectrometry, biomarker validation, and structure–function analysis.

Bio-Synthesis develops project-specific routes using solid-phase peptide synthesis (SPPS), protected modified amino acids, orthogonal chemistry, chemoselective ligation, and post-synthetic conjugation. The route is selected according to the PTM, sequence, number of modified sites, purification risk, and analytical requirements.

Although PTMs arise through enzyme-mediated cellular processes, synthetic PTM peptides provide homogeneous, site-specific research reagents that reduce the structural heterogeneity commonly encountered in biological samples.

Post-translational modification landscape A central synthetic PTM peptide is surrounded by biological PTM families and connected to research applications. SYNTHETIC PTM PEPTIDE defined site · sequence · stoichiometry PHOSPHORYLATION signal transduction GLYCOSYLATION recognition · biomarkers UBIQUITIN degradation · signaling SUMOYLATION nuclear regulation CITRULLINATION immune recognition ACETYLATION epigenetics SPPS · LIGATION · CONJUGATION · QC

Design principle: select the PTM according to the biological question, then design the modification site, synthetic route, purification method, and analytical confirmation as one integrated project.

Hub purpose: use this page to compare major PTM families and identify the most relevant dedicated service page. The broader Peptide Modifications hub covers structural, functional, labeling, linker, and conjugation chemistries beyond biological PTMs.

PTM Service Families
Major PTM Families

Explore custom post-translationally modified peptides

Each family card links to a dedicated scientific service page with chemistry, design options, applications, workflow, and quotation guidance.

Phosphorylated Peptides

Site-defined phosphoserine, phosphothreonine, and phosphotyrosine peptides for kinase, phosphatase, signaling, antibody, and proteomics studies.

pSer pThr pTyr
→

Glycopeptides

N-linked and O-linked glycopeptides for glycobiology, immune recognition, cancer biomarker, vaccine, and antibody-binding research.

N-linked O-linked Glycan-defined
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Acetylated Peptides

Site-defined lysine and terminal acetylation for histone biology, epigenetics, protein interactions, and PTM-specific antibody development.

Lys acetylation N-terminal
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Methylated Peptides

Site-defined lysine and arginine methylation for histone biology, epigenetic regulation, reader-domain studies, enzyme assays, and PTM-specific antibody development.

Lys methylation Arg methylation Histone PTMs
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Sulfated Peptides

Tyrosine-sulfated and related sulfonated peptides for chemokine, GPCR, receptor–ligand, extracellular recognition, and antibody studies.

Tyr sulfation Receptor binding
→

Citrullinated Peptides

Site-specific arginine-to-citrulline peptide models for PAD enzyme research, autoimmune epitopes, ACPA studies, and biomarker discovery.

PAD biology Autoimmunity
→

Ubiquitinated Peptides

Defined Lys(GG) peptides, monoubiquitinated constructs, and advanced ubiquitin conjugates for ubiquitinomics, DUB assays, and protein-degradation research.

Lys(GG) Isopeptide linkage
→

SUMOylated Peptides

SUMO-1, SUMO-2, SUMO-3, consensus-motif, and custom SUMO constructs for nuclear transport, transcription, DNA repair, and proteomics.

SUMO-1/2/3 ΨKxE motif
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Biology-First Navigation

Navigate PTMs by biological function

Select a biological pathway to reveal the most relevant PTM families, recommended research uses, and direct links to dedicated service pages.

Interactive PTM Selection Guide

Start with the research question you need to answer

Select a research area to compare the most relevant PTM family, likely peptide architecture, and analytical direction.

Select Your Research Area

Choose the closest research objective to identify a suitable PTM chemistry and related service page.

Recommended PTM Starting Point

Phosphorylated Peptides

Use site-defined phosphoserine, phosphothreonine, or phosphotyrosine peptides to model kinase substrates, phosphatase targets, antibody epitopes, and signaling motifs.

Primary residue Ser / Thr / Tyr
Common design Single- or multi-site phosphopeptide
Typical readout Kinase assay · antibody · LC-MS
Design note: Matched unmodified controls, stable isotope labels, affinity tags, or additional PTMs can be incorporated when the experimental design requires direct comparison or quantitative analysis.
Explore This PTM Discuss a Project
PTM Comparison Guide

Compare residue targets, biological roles, and common applications

This table provides a high-level starting point. Many PTMs act in multiple pathways, and sequence context can strongly influence biological interpretation.

PTM Family Typical Target Major Biological Roles Representative Applications Explore dedicated PTM page
Phosphorylation Ser, Thr, Tyr Signal transduction, enzyme regulation, protein interactions Kinase assays, phospho-antibodies, signaling research, proteomics →
Glycosylation Asn, Ser, Thr Cell recognition, folding, trafficking, immune interactions Glycobiology, cancer biomarkers, vaccines, antibody studies →
Acetylation Lys; N-terminus Epigenetic regulation, chromatin structure, protein interactions Histone research, reader-domain assays, PTM antibodies →
Methylation Lys, Arg Epigenetic regulation, chromatin signaling, RNA and protein interactions Histone research, methyltransferase and demethylase assays, reader-domain studies, PTM antibodies →
Sulfation Tyr Receptor binding, chemokine activity, extracellular recognition GPCR biology, ligand binding, receptor interaction studies →
Citrullination Arg → Cit Charge modulation, immune recognition, chromatin biology PAD studies, autoimmune epitopes, ACPA assays, biomarkers →
Ubiquitination Lys; N-terminal Met for M1 chains Protein degradation, trafficking, DNA repair, signaling Ubiquitinomics, DUB assays, E3 ligase studies, targeted degradation →
SUMOylation Lys Nuclear localization, transcription, DNA repair, stress response SUMO biology, UBC9 studies, proteomics, enzyme assays →
Integrated PTM Development Workflow

From biological question to characterized PTM peptide

Modification selection, synthesis route, purification, and analytical confirmation are planned as one integrated workflow.

1
Scientific Review

Sequence, biological objective, residue, and modification-site assessment

2
PTM Design

Single-site, multi-site, matched control, label, and scale planning

3
Custom Synthesis

SPPS, protected building blocks, ligation, or conjugation

4
Purification

Preparative HPLC and project-specific separation strategy

5
Analytical QC

LC-MS identity, analytical HPLC, and optional advanced testing

6
Release & Support

Documentation, formulation, packaging, and scale-up planning

Why Bio-Synthesis

Integrated expertise for complex PTM peptide projects

01

40+ Years of Peptide Experience

Long-standing expertise in custom peptide synthesis, modification, conjugation, purification, and analytical support.

02

Multiple PTM Chemistries

Support for small chemical PTMs, glycopeptides, protein-like modifiers, and project-specific synthetic routes.

03

Single- and Multi-Site Designs

Site-defined PTM placement, matched unmodified controls, combinatorial PTMs, and compatible labels or tags.

04

Fit-for-Purpose Purification

Purification strategies selected for polarity, charge, hydrophobicity, conjugate size, and product heterogeneity.

05

Analytical Verification

Mass confirmation and chromatographic purity assessment, with additional characterization selected by project need.

06

Research-to-Scale Support

Scientific consultation, custom documentation, formulation, packaging, and larger-scale manufacturing pathways.

Related Manufacturing & Analytical Services

Build a complete PTM peptide research workflow

Explore complementary services commonly ordered with post-translationally modified peptides.

These complementary technologies are frequently combined with PTM peptides to support quantitative proteomics, structural biology, assay development, antibody research, and bioconjugation.

Stable Isotope-Labeled Peptides

Heavy PTM peptide standards for quantitative LC-MS and biomarker validation.

AQUA Peptides

Quantitative internal standards with defined isotope labeling and release QC.

Quantitative LC-MS Peptides

Targeted proteomics standards, calibration materials, and analytical workflow support.

Custom Peptide Libraries

PTM scanning sets, epitope panels, and sequence variants for screening studies.

Site-Specific Modification

Controlled placement of labels, handles, spacers, and secondary modifications.

Peptide Bioconjugation

Attachment to proteins, oligonucleotides, carriers, surfaces, and small molecules.
Scientific Consultation & Quote

Need Help Selecting or Designing a PTM Peptide?

Share your peptide sequence, biological objective, desired PTM site, matched-control requirements, additional labels or PTMs, quantity, purity, and analytical needs. Our peptide scientists can evaluate the modification strategy, synthetic route, purification risk, and appropriate QC before manufacturing begins.
Request a Quote Consult a Peptide Scientist

Need help before quoting?

Email: info@biosyn.com
Phone: 800-227-0627 (US/CAN)
Phone: +001-972-420-8505 (INT)

Project Information

  • Peptide sequence and desired PTM position(s)
  • Biological objective and assay format
  • Required matched modified/unmodified controls
  • Additional labels, isotopes, tags, or conjugation handles
  • Quantity, purity, formulation, and packaging
  • Relevant literature, native protein context, or reference standard

How We Evaluate Your Design

Our scientists review PTM chemistry, sequence behavior, modification order, protecting-group compatibility, synthetic route, solubility, purification complexity, analytical confirmation, and project-specific release requirements. When a requested design is impractical, we explain the limitation and propose a scientifically sound alternative.

Quality Systems & Manufacturing Support

Controlled support from research design through release

QMS

ISO-Supported PTM Peptide Manufacturing

Complex PTM projects are supported by documented synthesis, purification, analytical characterization, traceability, and project-specific packaging from research quantities through scale-up.

Certified Quality Systems ISO 9001:2015, ISO 13485:2016, and ISO 14001-supported operations.
Advanced PTM Chemistry Protected building blocks, orthogonal strategies, ligation, conjugation, and multi-modification planning.
Analytical Characterization Analytical HPLC or UPLC, LC-MS, optional HRMS, and project-specific testing.
Flexible Manufacturing Custom purification, formulation, documentation, and research-to-production scale support.

FAQ

What is a post-translational modification?
A post-translational modification is a chemical or protein-based change introduced after a protein or peptide is translated. PTMs can regulate activity, localization, stability, conformation, recognition, and interactions.
Why use synthetic PTM peptides?
Synthetic PTM peptides provide defined sequence, modification site, and stoichiometry. They are useful as homogeneous substrates, epitopes, controls, and analytical standards when native proteins are heterogeneous or difficult to isolate.
How are PTM peptides synthesized?
Depending on the modification, routes may use SPPS with protected modified amino acids, selective side-chain deprotection, chemoselective ligation, native chemical ligation, enzymatic steps, or post-synthetic conjugation.
Can one peptide contain multiple PTMs?
Often yes. Multi-PTM peptides require careful planning of building blocks, protecting groups, reaction order, purification, and analytical confirmation. Feasibility is reviewed sequence by sequence.
Can I order matched modified and unmodified control peptides?
Yes. Matched controls are strongly recommended for many antibody, enzyme, binding, and biomarker studies because they help distinguish PTM-dependent effects from sequence-dependent effects.
How are PTM peptides purified and characterized?
Preparative HPLC is commonly used, followed by analytical HPLC or UPLC and mass spectrometry. Complex glycopeptides or protein-like conjugates may require additional orthogonal analytical methods.
Can PTM peptides be combined with stable isotope labels?
Yes. Site-defined PTMs can often be combined with heavy amino acids to create quantitative LC-MS standards for targeted proteomics, biomarker verification, and method development.
Do PTMs affect peptide solubility?
They can. Phosphorylation and sulfation add negative charge, citrullination removes positive charge, glycosylation may increase hydrophilicity, and large protein-like modifiers can change aggregation and handling behavior.
Can PTM peptides be used as immunogens?
Yes. PTM-specific immunogens can support antibody development, often with a matched unmodified control peptide and carrier conjugation strategy. The epitope and conjugation site should be designed together.
What information is needed for a feasibility review?
Provide the sequence, PTM type and site, intended application, desired controls, quantity, purity, additional modifications, formulation, and any relevant literature or reference material.
More FAQ'sAll FAQ's
Scientific Background & Recommended Reading

Recommended Reading

Selected reviews covering the biological diversity, analytical study, and functional importance of post-translational modifications.

  1. Walsh CT, Garneau-Tsodikova S, Gatto GJ Jr. Protein posttranslational modifications: the chemistry of proteome diversifications. Angewandte Chemie International Edition. 2005;44:7342–7372.
  2. Khoury GA, Baliban RC, Floudas CA. Proteome-wide post-translational modification statistics: frequency analysis and curation of the Swiss-Prot database. Scientific Reports. 2011;1:90.
  3. Jensen ON. Interpreting the protein language using proteomics. Nature Reviews Molecular Cell Biology. 2006;7:391–403.
  4. Deribe YL, Pawson T, Dikic I. Post-translational modifications in signal integration. Nature Structural & Molecular Biology. 2010;17:666–672.
  5. Olsen JV, Mann M. Status of large-scale analysis of post-translational modifications by mass spectrometry. Molecular & Cellular Proteomics. 2013;12:3444–3452.
  6. Prabakaran S, Lippens G, Steen H, Gunawardena J. Post-translational modification: nature's escape from genetic imprisonment and the basis for dynamic information encoding. Wiley Interdisciplinary Reviews: Systems Biology and Medicine. 2012;4:565–583.
Scientific note: PTM function depends on sequence context, modification occupancy, neighboring PTMs, protein structure, and cellular environment. Synthetic peptides provide controlled models but should be interpreted alongside the native biological system.

Why Choose Bio-Synthesis

Trusted by biotech leaders worldwide for over 45 years of delivering high-quality, fast, and scalable synthetic biology solutions.

Greetings, Researchers,

Please be advised that any information, guidelines, write-ups, 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 design of products intended for their experiments before submitting
their designs to Biosynthesis for production feasibility review.
Thank you for your understanding.

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