Add mmCIF to PDB conversion script

configs/data/components/convert_mmcif_to_pdb.yaml

@@ -0,0 +1,5 @@
+input_mmcif_dir: ???
+output_pdb_dir: ???
+model_index_to_select: 0
+dataset: "N/A"
+lowercase_id: false

src/data/components/convert_mmcif_to_pdb.py

@@ -0,0 +1,61 @@
+# -------------------------------------------------------------------------------------------------------------------------------------
+# Following code curated for PoseBench: (https://github.com/BioinfoMachineLearning/PoseBench)
+# -------------------------------------------------------------------------------------------------------------------------------------
+
+import logging
+import os
+
+import hydra
+import rootutils
+from Bio import PDB
+from omegaconf import DictConfig
+from tqdm import tqdm
+
+logging.basicConfig(format="[%(asctime)s] {%(filename)s:%(lineno)d} %(levelname)s - %(message)s")
+logger = logging.getLogger(__name__)
+
+rootutils.setup_root(__file__, indicator=".project-root", pythonpath=True)
+
+
+def convert_mmcif_to_pdb(mmcif_file: str, pdb_file: str):
+    """Convert an mmCIF file to a PDB file."""
+    parser = PDB.MMCIFParser(QUIET=True)
+    structure = parser.get_structure("structure", mmcif_file)
+
+    io = PDB.PDBIO()
+    io.set_structure(structure)
+    io.save(pdb_file)
+
+
+@hydra.main(
+    version_base="1.3",
+    config_path="../../../configs/data/components",
+    config_name="convert_mmcif_to_pdb.yaml",
+)
+def main(cfg: DictConfig):
+    """Convert an input directory of mmCIF files to an output directory of PDB files."""
+    os.makedirs(cfg.output_pdb_dir, exist_ok=True)
+
+    for id in tqdm(
+        os.listdir(cfg.input_mmcif_dir),
+        desc=f"Converting mmCIF to PDB for {cfg.dataset}",
+    ):
+        new_id = id.replace("fold_", "")
+        if cfg.lowercase_id:
+            # Support the DockGen dataset's hybrid lowercase-uppercase pdb id-CCD ID format
+            new_id_parts = new_id.split("_")
+            new_id = "_".join([part.lower() for part in new_id_parts[:2]] + new_id_parts[2:])
+        else:
+            new_id = new_id.upper()
+        mmcif_filepath = os.path.join(
+            cfg.input_mmcif_dir, id, f"{id}_model_{cfg.model_index_to_select}.cif"
+        )
+        pdb_filepath = os.path.join(cfg.output_pdb_dir, f"{new_id}.pdb")
+        if os.path.isfile(mmcif_filepath):
+            convert_mmcif_to_pdb(mmcif_filepath, pdb_filepath)
+
+    logger.info(f"Converted mmCIF files to PDB files for {cfg.dataset} dataset.")
+
+
+if __name__ == "__main__":
+    main()