Boltz-2

Structure Prediction ~10mv2.2.1

AlphaFold3 reproduction, predict protein/nucleic acid/small molecule complexes

Example Results API Docs Batch Mode
Examples
8JYR - Antibody complex
7QF4 - Protein complex
Protein-Ligand Complex + Affinity
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Chain A

Cyclic

Restraints constrain how different chains are arranged in your complex, and can be used to incorporate prior knowledge of structural contacts into your structure prediction.

Use YAML file input

Upload a Boltz YAML configuration file instead of filling out the UI. MSA entries are not required - MSAs are computed and injected automatically for protein chains.


Number of Recycles

Number of rounds of refinement during structure prediction. Higher values may improve accuracy but take longer.


Step Scale

Lower step scale means more diversity (recommended between 1 and 2).


Number of Seeds

Number of jobs to submit. Each job uses a random seed by default.


Seed (optional)

Set a specific seed for reproducibility, or leave blank for a random seed.


Output Format

File format used for predicted structures.


Boltz Version

Which Boltz model version to use for prediction.


Method

Experimental method bias for the prediction (optional).


Templates

Upload template CIF or PDB files to guide the structure prediction.


Template Distance Threshold

Controls the distance (in Angstroms) that the prediction can deviate from the template.


Use Potentials

Run the original Boltz-2 model using inference time potentials. Significantly improves the physical quality of the poses.


Use Multiple Sequence Alignment

When disabled, Boltz will not use MSA data for prediction.


Custom A3M Files

Upload your own a3m MSAs instead of generating them. The first sequence in each a3m must be exactly the sequence of the protein chain it is for, in uppercase. Chains you assign an a3m to skip MSA generation.


Custom CCD Definitions

For ligands or residues not in the PDB Chemical Component Dictionary, such as a custom covalent linker: one chem_comp mmCIF per component. Use its _chem_comp.id as the CCD code and its atom names in covalent bonds; define a linker in its bonded form.


Max MSA Sequences

Max number of sequences to use for MSA. Use a smaller value for a more shallow MSA, which may produce predictions closer to your template.


Generate IPSAE metrics

Generate IPSAE metrics for protein-protein complex interfaces.

All sequences must be non empty.