Chimeric Polypeptide Libraries for Stable Target Binding Screening

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Solution Overview

Problem

Existing methods struggle to efficiently identify and select constrained polypeptides capable of specific protein-protein interactions due to their intrinsic flexibility, particularly for short linear polypeptides, which transition multiple structural states energetically.

Innovation Solution

A library of chimeric polypeptides is developed, comprising fragments from peptidyl-prolyl cis/trans isomerase or FKBP family members, encoded by nucleic acids, to display variable sequences that bind to predetermined targets, using in vitro translation systems to identify and select amino acid sequences that form stable complexes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If short linear polypeptides are used for protein-protein interactions, then they can perform specific binding functions, but their intrinsic flexibility causes them to transition through multiple structural states, reducing binding stability and specificity

Engineering Contradiction:

Improvebinding functionVSAvoidstructural stability

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The patent applies parameter changes by modifying the polypeptide structure from flexible linear sequences to constrained cyclic or knotted configurations. This structural parameter change reduces conformational entropy and stabilizes the bound state, directly addressing the contradiction between binding adaptability and structural stability. The constrained polypeptides maintain their ability to bind specific targets while eliminating the detrimental flexibility that causes multiple structural transitions.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates composite structures by combining peptide sequences with constraining elements such as disulfide bonds, cyclic configurations, or knotted topologies. This composite approach integrates the binding functionality of linear polypeptides with the structural stability of constrained architectures, resolving the contradiction by making the polypeptide both adaptable for binding and stable in its bound conformation.

Inventive Principle:

Principle #40Composite materials

2Productivity

If conventional display methods are used to identify binding polypeptides, then libraries can be screened, but the methods are inefficient for selecting constrained polypeptides due to the flexibility issue

Engineering Contradiction:

Improvescreening efficiencyVSAvoidselection accuracy

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies preliminary action by pre-constraining the polypeptide structures before screening. Instead of screening flexible polypeptides and hoping to find stable binders, the invention预先 designs and synthesizes constrained polypeptide libraries where the structural stability is built-in. This preliminary structural constraint ensures that during screening, the polypeptides maintain consistent conformations, dramatically improving both screening efficiency and selection accuracy for reliable binders.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12540318B2Nucleic acids encoding chimeric polypeptides for library screening

Publication Date: 2026.02.03 ROCHE DIAGNOSTICS OPERATIONS INC

AI summary

The present disclosure is directed to a library of chimeric polypeptides comprising one or more fragments from the peptidyl-prolyl cis/trans isomerase or FKBP family displaying one or more polypeptides on one or more FKBP members and its use in methods for the screening and selection of constrained peptide surrogates exhibiting binding activity versus predetermined target molecules.