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Date

Participants

Goals

  • Anticipated Rosemary infrastructure

  • Decisions for protein library charges

Discussion topics

Item

Presenter

Notes

Anticipated Rosemary infrastructure

Chapin Cavender

  • Infrastructure team is updating their roadmap for the next year. Do we anticipate any infrastructure needs for the biopolymer force field beyond the minimum viable product that we should have on the roadmap?

  • Support for QM/MM calculations in QCArchive/QCSubmit

    • Explicit representation of solvent sampled from MD trajectory, like IPolQ

      • Solvate di/tri/tetrapeptides in specific water model (and possibly salt ions), run MD until solvent ESP converges, fit small number of point charges to reproduce solvent ESP

      • QM solute with MM from fit point charges

    • Sample snapshots from a protein trajectory obtained with candidate force field parameters for subsequent retraining

      • Choose snapshots by clustering or filling gaps in phase space absent from existing training data

      • QM for subset of residues, MM for rest of protein and/or solvent

Decisions for protein library charges

Chapin Cavender

  • ELF10 library charges for amino acids from Lily Wang obtained by averaging over Ace-Val-X-Y-Z-Nme

  • What residues should have library charges?

    • Alternate protomer/tautomers?

    • Non-capped termini?

  • What SMIRKS strings should we use?

    • SMIRNOFF port of Amber ff14SB?

    • Should we specify stereochemistry?

  • How do we handle non-integer averaged charges?

    • Normalize like toolkit assign_partial_charges()?

Action items

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Decisions

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