impropers for protonated 1-methyladenosine

From: Francesco Pietra (chiendarret_at_gmail.com)
Date: Mon Oct 18 2021 - 02:38:14 CDT

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Hello all
While attempting minimization of a protein-ribonucleotide containing
modified nucleotides, error arose

FATAL ERROR: UNABLE TO FIND IMPROPER PARAMETERS FOR CG2R64 CG2RC0 NG2P1
NG2P1 (ATOMS 4433 4432 4437 4434)

These atom types relate, in the given order, to atomnames C6 C5 N1 N6 of
protonated 1-methyladenosine *resname 1MA in the most recent CHARMM36
psarameterization, Jul21)

Added parameters included par_all36_na.prm,
ppar_all36_na_rna_modified.str, par_all36_carb.prm. Is any other place from
where such impropers are available>

Thanks for advice
francesco pietra

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