No parameter for ribose ring, Charmm 27

From: Lennart Nilsson (
Date: Fri May 27 2016 - 05:42:02 CDT

CHARMM36 parameters for Inosine (and all other known naturally occurring RNA nucleotide modifications, including various tautomers and protonation states) have recently been published:
 Xu, Y., Vanommeslaeghe, K., Aleksandrov, A., MacKerell, A. D., and Nilsson, L. (2016) Additive CHARMM force field for naturally occurring modified ribonucleotides, Journal of Computational Chemistry 37, 896-912. (

The RTF and parameters are available in the supporting material, and also at Alex MacKerell's website:
 ( in the file toppar_c36_feb16.tgz (toppar/stream/na/ toppar_all36_na_rna_modified.str)

Lennart Nilsson
Karolinska Institutet

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