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N-Terminal PRO Wrong sp³ Hybridization in bio-forge Causes dreid-typer Atom-Type Failure #19

@TKanX

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@TKanX

Description:

bio-forge ≤0.4.0 treats every N-terminal residue as a primary amine in ops::hydro::construct_n_term_hydrogens, ignoring that PRO's backbone nitrogen is a secondary amine (N–CA + N–CD). This over-places one hydrogen and omits the N–CD direction constraint, producing an invalid N coordination geometry. dreid-typer derives DREIDING atom types from degree and bond angles; the spurious hydrogen inflates the nitrogen degree and pushes angles outside the sp³ window, failing atom-type assignment and halting parameterization. Fixed in bio-forge v0.4.1.

Tasks:

  • Bump bio-forge to 0.4.1

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