proteinmpnn-nim

ProteinMPNN NIM

Design protein sequences for a supplied backbone PDB. Use this SKILL.md for first-pass hosted/local usage; load supplemental files only when needed:

• references/api.md: exact endpoints, schemas, Docker flags, response fields.
• references/science.md: inverse-folding uses, limits, and validation.
• references/parameters.md: design controls, fixed positions, sampling.
• references/validation.md: FASTA, score, and structure checks.
• references/examples.md: compact hosted/local request patterns.

Choose Mode

Ask only when context is unclear:

Hosted NVIDIA API or local Docker NIM?

• Hosted: https://health.api.nvidia.com/v1/biology/ipd/proteinmpnn/predict
• Local: http://localhost:8000/biology/ipd/proteinmpnn/predict

Local inference paths do not include /v1/. Hosted requests use Authorization: Bearer $NGC_API_KEY. Supported local Docker startup uses NGC_API_KEY (or NVIDIA_API_KEY via the preflight) for registry login, entitlement checks, and first-run model downloads; pass it into the container with -e NGC_API_KEY. Local inference requests use no auth header after readiness. Warm-cache key-free startup varies by image/version and should not be assumed.

Local Docker

For local setup answers, copy the preflight below exactly before docker login, docker run, readiness, and the no-auth local request. Do not answer with only a localhost Python request. This NIM's cache mount is unique: /home/nvs/.cache/nim, not /opt/nim/.cache.

set -a
[ -f .env ] && . ./.env
set +a

if [ -z "${NGC_API_KEY:-}" ] && [ -n "${NVIDIA_API_KEY:-}" ]; then
  export NGC_API_KEY="$NVIDIA_API_KEY"
fi
: "${NGC_API_KEY:?Set NGC_API_KEY or NVIDIA_API_KEY}"
: "${LOCAL_NIM_CACHE:?Set LOCAL_NIM_CACHE}"

echo "$NGC_API_KEY" | docker login nvcr.io --username '$oauthtoken' --password-stdin

export NIM_TEST_GPU="${NIM_TEST_GPU:-0}"
mkdir -p "${LOCAL_NIM_CACHE}"
chmod 777 "${LOCAL_NIM_CACHE}"

docker run -it \
  --runtime=nvidia \
  --gpus "device=${NIM_TEST_GPU}" \
  -e NGC_API_KEY \
  -v "${LOCAL_NIM_CACHE}:/home/nvs/.cache/nim" \
  -p 8000:8000 \
  nvcr.io/nim/ipd/proteinmpnn:latest

Readiness:

until curl -sf http://localhost:8000/v1/health/ready; do sleep 5; done

Request Pattern

Read PDB content inline; do not send only a file path.

import os
from pathlib import Path
import requests

HOSTED = True
pdb_content = Path("1R42.pdb").read_text()
url = (
    "https://health.api.nvidia.com/v1/biology/ipd/proteinmpnn/predict"
    if HOSTED else "http://localhost:8000/biology/ipd/proteinmpnn/predict"
)
headers = {"Content-Type": "application/json"}
if HOSTED:
    headers["Authorization"] = f"Bearer {os.environ['NGC_API_KEY']}"

payload = {
    "input_pdb": pdb_content,
    "num_seq_per_target": 10,
    "sampling_temp": [0.1],
    "use_soluble_model": False,
    "ca_only": False,
}
response = requests.post(url, headers=headers, json=payload, timeout=300)
response.raise_for_status()
result = response.json()

Common controls:

• Redesign only chain A: "input_pdb_chains": ["A"].
• Exclude amino acids: "omit_AAs": ["C"] or "omit_AAs": ["M"].
• Diversity: "sampling_temp": [0.1, 0.3, 0.5] (always a list).
• Solubility bias: "use_soluble_model": True.
• Candidate count: num_seq_per_target is 1-100.

Save And Report Output

mfasta = result["mfasta"]
Path("designed_sequences.fa").write_text(mfasta)

# Scores correspond to designed sequences. The mfasta may include a native/WT
# row; do not pair that row with generated-sequence scores.
headers = [line for line in mfasta.splitlines() if line.startswith(">")]
designed_headers = [
    h for h in headers if "native" not in h.lower() and "wt" not in h.lower()
]
for header, score in zip(designed_headers, result.get("scores", [])):
    print(f"{header} score: {score:.4f}")

Validate promising designs by predicting structures with Boltz2 or OpenFold3 and comparing them to the target backbone. For FASTA/score sanity checks, read references/validation.md.

Limits And Troubleshooting

• Minimum GPU VRAM: about 3 GB.
• sampling_temp must be a list, even for one value.
• Empty mfasta: check non-empty input_pdb and num_seq_per_target >= 1.
• PDB parse errors: use valid PDB ATOM records.
• Local URL 404 usually means an accidental /v1/ prefix.
• Cache mount error: use /home/nvs/.cache/nim inside the container.