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.