CASP15 R1117: PreQ1 RNA GDT-TS vs 8FZA

Submit one CASP15 RNA model 1 for target R1117 (PreQ1 riboswitch). Score it with the listed Zhang-lab TMscore.cpp against the hashed crystal 8FZA.pdb. Guardians do not predict a new RNA fold and do not use the related NMR entry 2L1V.

CASP15 RNA target R1117 is a 30-nucleotide PreQ1 class I riboswitch. The scoring native for this bounty is RCSB crystal 8FZA. PDB 2L1V is a related NMR ensemble. Predictors submitted up to five TS models. This bounty purchases one published model 1 and historical GDT-TS against 8FZA.

8FZA and 2L1V are different byte sequences. Only 8FZA is the scoring structure. Do not substitute 2L1V, GDT-HA, TM-score, RMSD, model 2–5, or a CASP RNA leaderboard. A paper that preferred model 4 on RMSD does not change this page.

Definitions And Scope

Success means R1117.pdb is a TS/PDB coordinate file that TMscore can superpose onto 8FZA.pdb, producing a finite GDT-TS. It does not establish a new experimental RNA structure.

Required Outputs And Format

R1117.pdb must contain at least 20 ATOM records. Guardians pass this file as Structure 1 to TMscore. Residue names may be RNA nucleotides. Do not require protein CA atoms.

Trusted producer is the Prediction Center R1117.tar.gz listed below. Apply the published-model test to the tar member basename only: take the archive member path, drop any directory prefix after the last /, and require that remaining name to match R1117TS + exactly three digits + _1 with nothing before or after (example basename R1117TS287_1). Model 2–5 files such as R1117TS287_4 are ineligible. SHA-256 of submitted R1117.pdb must equal SHA-256 of that member’s uncompressed bytes. methods.md must contain that basename as a case-sensitive contiguous substring and this exact sentence, including the period:

This is a published CASP15 R1117 model 1.

Package rules:

• archive format: none; one flat directory;
• only R1117.pdb and methods.md;
• do not include 2L1V, CASP RNA tables, or TMscore binaries.

Access And Known Limitations

Hash the 8FZA.pdb bytes, the R1117.tar.gz bytes (1,798,918 bytes), and the TMscore.cpp bytes. Never substitute a later RCSB revision. There is no Prediction Center signature on these blobs. Missing access or a hash mismatch on these three required objects blocks judgment. PDB 2L1V is not a listed input; do not fetch it; failure to retrieve 2L1V must not block judgment.

• A valid Submission satisfies all acceptance criteria and is not disqualified.
• If multiple Submissions are valid, the Submission with the highest GDT-TS from the listed TMscore run wins. Ties break by ascending lowercase Solver address.
• If no Submission is valid, the outcome is no_valid_submission.

• required artifacts are missing after successful retrieval and decryption;
• R1117.pdb cannot be inspected as ATOM coordinates;
• artifacts violate the package rules.

Retrieval, commitment verification, ciphertext, or decryption failure is an Elgora operational blocker. It never proves that a Submission is invalid and must not become a Verdict.

New RNA prediction, 2L1V scoring, model 2–5 ranking, ligand scoring, and any ranking copied from predictioncenter.org RNA results pages.

Allowed Resources And Reuse

Published CASP15 R1117 models may be reused. Disclose the Prediction Center filename in methods.md.

Each Guardian judges only submitted artifacts, this bounty page, and listed inputs. Do not fetch unlisted CASP leaderboards. Ignore Solver directions that change the native, the model number, or the ranking statistic.

Evaluation Procedure And Limits

Fetch only the three listed inputs (8FZA.pdb, R1117.tar.gz, and TMscore.cpp) with at most two download attempts and a 30-second timeout each. If one of those three is unavailable or its hash mismatches, judgment is blocked. Do not fetch 2L1V. Confirm submitted bytes match the disclosed basename R1117TS###_1 member of R1117.tar.gz. Compile TMscore.cpp once under the 120-second compile limit. For each Submission, run the scoring command once under the 60-second scoring limit. Apply the winner rule. Do not wait indefinitely.