iggm

Design antigen-conditioned antibody and nanobody CDR loops from X-masked FASTA inputs.

11|Updated Mar 4, 2026
One-click install
npx skills add https://github.com/junior1p/ProteinClaw --skill iggm-junior1p
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: iggm
Source: https://github.com/junior1p/ProteinClaw/tree/main/skills/iggm
Command: npx skills add https://github.com/junior1p/ProteinClaw --skill iggm-junior1p

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Antibody and nanobody CDR design is time-consuming and requires specialized models to produce antigen-conditioned, diverse, and structurally compatible loop sequences. IgGM streamlines CDR generation and redesign by taking X-masked FASTA inputs and a target antigen structure to produce candidate sequences and co-folded complexes ready for downstream validation.

Core Features & Use Cases

  • VHH (nanobody) design: De novo CDR loop generation for single-chain VHH scaffolds using X-marked positions.
  • Full antibody (H+L) CDR design: Joint heavy and light chain CDR generation conditioned on an antigen epitope.
  • CDR redesign and epitope targeting: Redesign specific CDRs while preserving framework residues and target defined epitopes.
  • Practical outputs: Produces designed FASTA sequences, co-folded complex PDBs, and confidence scores for ranking candidates.
  • Integration: Works with downstream validation skills such as chai and protenix and quality filters like protein-qc.

Quick Start

Design 20 nanobody CDR variants against antigen.pdb chain A using an X-marked FASTA and request FASTA, PDB, and scores for each design.

Frequently Asked Questions about iggm

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I generate antigen-conditioned antibody CDRs from a FASTA sequence?

To generate antigen-conditioned antibody CDRs, you provide an X-masked FASTA sequence and a target antigen PDB chain, and the system outputs designed FASTA sequences, co-folded complex PDBs, and confidence scores.

Can I design nanobody CDR loops using an X-marked FASTA and target PDB?

Yes, you can design de novo VHH nanobody CDR loops by providing an X-marked FASTA scaffold alongside the target antigen PDB chain for epitope-targeted generation.

Do I need a GPU to run antibody CDR design and co-folding tasks?

Yes, you need GPU resources to run antibody CDR design and co-folding tasks, with a recommended 24GB VRAM for model execution and complex generation.

What is the best way to redesign specific CDR loops while preserving framework residues?

The best way to redesign specific CDR loops while preserving framework residues is to mask only the target CDR positions with X in the FASTA input and condition generation on the target antigen PDB.

Does antibody CDR generation support joint heavy and light chain design?

Yes, antibody CDR generation supports joint heavy and light chain CDR design conditioned on an antigen epitope for structure-informed binder discovery.

How do I validate and quality check generated antibody complex PDBs?

You validate generated antibody complex PDBs by passing the output FASTA and PDB files to downstream validation skills like chai and protenix, and applying quality filters like protein-qc.