T cell truncated library - Science Peptide

T-cell truncated library | T-cell epitope fine localization | Minimal epitope screening | Immune peptide library | Science-Peptide

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Need precise localization of the minimum core sequence of T-cell epitopes? Science-Peptide provides professional T-cell truncated library synthesis services, truncating from the N-terminus, C-terminus, or both ends step by step, with rapid delivery to support T-cell immunity research. Welcome to inquire.

T-cell epitope research: Finding the shortest one is often the most crucial

What is a T-cell truncated library?
Those who conduct T-cell immunity research know that screening out a positive peptide is only the first step. The next question is: is the entire peptide or just a small segment truly recognized by T cells?

The T-cell truncated library is used to answer this question. Starting with the positive long peptide obtained from the initial screening, amino acids are cleaved step by step from the N-terminus, C-terminus, or both ends, creating a series of increasingly shorter peptides. Then, T-cell function experiments are used to test each one until the "shortest version" that can still activate T cells is found.

This shortest version is the core epitope that T cells actually recognize.

Why Truncation?

Precise localization: Identifying the core sequence for MHC molecule presentation and TCR recognition
Mechanism Research: Understanding the Boundary Requirements of Epitope Processing and Presentation
Vaccine Optimization: Designing Vaccines with the Shortest Effective Sequences to Avoid Interference from Irrelevant Sequences
Diagnostic Development: Improving the Specificity of Detection Reagents

What Can We Do?

1. Multiple Truncation Methods to Cover Various Research Needs

Truncation Methods	Explanation	Applicable Scenarios
N-terminal truncation	Cleavage amino acids one by one from the N-terminus	Determine the N-terminal boundary
C-terminal truncation	Cleavage amino acids one by one from the C-terminus	Determine the C-terminal boundary
Truncation at Both Ends	Simultaneous Truncation at Both Ends	Rapidly Narrowing the Range for Precise Localization
Unequal Step Size Truncation	Large-Step Coarse Screening First, Then Fine-Step Precise Localization	Initial Screening of Long Peptides, Saving Time and Costs

2. Library Design: From Positive Peptides to Minimal Epitopes

Parameters	Explanation
Parent Peptide Length	Usually 8-25 amino acids (common length for T cell epitope screening)
Truncation Methods	N-terminus, C-terminus, or both
Truncation Step Size	Generally, truncate 1 amino acid at a time, or start with large steps and then smaller steps
Minimum Length	Usually, 5-9 amino acids (MHC class I epitopes) or 9-15 (MHC class II epitopes) are retained.
Control Peptide	Parent Peptide Sequence (Positive Control), Irrelevant Peptide (Negative Control)

Example: A positive peptide with 15 amino acids obtained from initial screening, and we want to perform N-terminal truncation to determine the smallest epitope.
Epitope 1: Remove the first position (14mer)
Epitope 2: Remove the first two positions (13mer)
Epitope 3: Remove the first three positions (12mer)
Until 5-6 amino acids are retained

3. Synthetic Capacity

Project	Capacity
Peptide Length	5-25 amino acids (after truncation)
Library Size	10-50 peptides (depending on the length of the parent peptide and the truncation method)
Purity Options	Crude (70-85%), Regular Purity (85-95%), High Purity (95-98%)
Yield per Peptide	0.5-5 mg (usually sufficient for T cell experiments)
Delivery Method	96-well plate, single centrifuge tube, vial
Cycle	2-3 weeks for up to 20 peptides

4. Quality control: Data available for each peptide

We provide every peptide in the T-cell truncated library:

MS Mass Spectrometry: Confirms correct molecular weight

HPLC Purity: Purity data for crude or purified products

COA Report: One report per peptide, searchable by length or truncation method

Optional services:

Peptide content determination: For precise quantification, this is available

Solubility Test: Recommended suitable solvents (DMSO, PBS, etc.)

Endotoxin detection: Used in cell experiments, ensuring no interference

Why choose us for your T-cell truncated library?

1. We've been doing this for 20 years
A T-cell truncated library sounds like "a batch of increasingly shorter peptides," but ensuring that every peptide is correct, of sufficient purity, and delivered on time involves many details. Over the years, we've helped clients build various truncated libraries, from MHC class I to MHC class II, from mice to humans, and the process is already well-established.

2. Flexible truncation methods, understands your experimental design
Some companies only know how to truncate one end, and they're clueless when they try to change the method. We are different:
N-terminal Truncation: Standard procedure
C-terminal Truncation: Equally proficient
Shortening at both ends: allows for the design of combination libraries
Two-step truncation: first, a large-scale coarse screening (cutting 2-3 pieces each time), then a fine-step precise positioning after finding the activity range-saving money and time

3. Purity as needed, avoiding unnecessary expenses
T cell experiments have certain purity requirements, but higher is not always better.
Crude product (70-85%): used for initial screening, first checking which lengths still have activity, saving money.
Conventional purity (85-95%): Suitable for most T cell experiments (ELISPOT, ICS), cost-effective.
High purity (95-98%): requires precise quantification or structural studies, resulting in more stable results.

4. Complete data, no worries about publication
I've provided the MS and HPLC data for each peptide, organized in Excel. It clearly shows which peptide corresponds to which length, its purity, and whether the molecular weight is correct. You can include the supplementary information in your paper without having to organize it yourself.

5. Need endotoxin control? We can do it
T cell experiments are sensitive to endotoxins. We can provide endotoxin testing services to ensure that the endotoxin level of each peptide is below 0.1 EU/mg, which does not affect cell function.

6. From screening to validation, we follow you all the way
After finding the minimal epitope, more follow-up work is often required: such as synthesizing MHC tetramers, conducting structural studies, and developing T-cell receptors. Science-Peptide can seamlessly connect these stages-the same project, the same contact person, without the need for readjustment.

Where Is the T-Cell Epitope Truncated Library Used?

Research areas	Applications	Recommended truncation methods
Infection immunity	To identify the minimal T-cell epitope of viral or bacterial antigens	N-terminal + C-terminal Truncation
Tumor immunity	Precisely locating the core epitope of neoantigens	Truncation at Both Ends
Autoimmune diseases	To identify the core sequence for self-reactive T-cell recognition	N-terminal Truncation or C-terminal Truncation
Vaccine development	Designing vaccines using the shortest effective epitope	Truncation at Both Ends
T-cell receptor research	Minimum requirements for TCR recognition research	N-terminal + C-terminal Truncation
Immune monitoring	Developing epitope-specific detection methods	Synthesis after determining the minimum epitope

Delivery and quality control

Delivery format:
96-well plate (one peptide per well, lyophilized powder, labeled with truncation method and length)
Or individual centrifuge tube repackaging (on demand)
Marking information: truncation method, length, sequence, molecular weight, purity

Accompanying Documents:
Excel summary table (sequence, MW, purity, MS file link for all peptides)
Individual COA (PDF) for each peptide
Library Design Summary Report (explaining the truncation method and length for each peptide)
Optional: Endotoxin Detection, Solubility Data, Peptide Content Determination
Before each T-cell truncated library is sent out, we check it to ensure that the truncation method is correct, the peptide number is correct, and the data is complete.

Three Real-World Cases

Case 1: Viral Infection Project at a Research Institute

A client used an overlapping peptide library to screen out a 15-amino acid T-cell epitope and wanted to determine the minimal core sequence. We synthesized N-terminal truncated libraries (from 15mer to 7mer) and C-terminal truncated libraries (from 15mer to 7mer), totaling 18 peptides with a purity >90%. The client used ELISPOT assays and found that the 8 amino acid peptides at positions 5-12 could still activate T cells; any shorter peptides were ineffective, precisely locating the core epitope.

Case 2: Neoantigen Project at a Tumor Immunology Company

The client identified a mutation-derived T-cell epitope from a patient's tumor sample, a long peptide of 13 amino acids. We designed an unequal-step truncation strategy: first synthesizing a coarse screening library (7 peptides) with two peptides cleaved at each N-terminus and C-terminus; after finding the activity range, then a precise localization library (6 peptides) with one peptide cleaved at each step near the activity boundary. Two batches totaling 13 peptides were delivered in 3 weeks. The client validated the results using ICS, ultimately locating a core epitope of 9 amino acids.

Case 3: Autoimmune Disease Research Project

The client, researching autoreactive T cells in type 1 diabetes, had identified a 12-amino acid positive peptide and wanted to determine its core epitope. We synthesized N-terminal truncated libraries (12mer to 6mer) and C-terminal truncated libraries (12mer to 6mer), totaling 14 peptides, and provided endotoxin detection (<0.1 EU/mg). The client used T cell proliferation experiments and found that the 8 amino acid peptides at positions 3-10 retained activity; subsequently, tetramer staining was performed using this minimal epitope.

Let's talk about your T-cell truncated library needs?

Whether you need to target viral epitopes, tumor neoantigens, or autoimmune targets, we can help you design and synthesize high-quality T-cell truncated libraries.

What You Need to Tell Me:
Parent Peptide Sequence (Positive Peptides Obtained from Initial Screening)
Parent peptide length and known information (MHC type, etc.)
Truncation method (N-terminal, C-terminal, or both ends)
Truncation Strategy (Cut One Peptide at a Time or Two-Step Method)
Minimum Retention Length
Quantity Required for Each Peptide
Purity Requirements

Is Endotoxin Detection Required?
Delivery Format (Plate or Tube)

When do you need it?

We will give you a quote and delivery schedule within 24 hours.