Development of the four-body corrected fragment molecular orbital (FMO4) method

Tatsuya Nakano, Yuji Mochizuki, Katsumi Yamashita, Chiduru Watanabe, Kaori Fukuzawa, Katsunori Segawa, Yoshio Okiyama, Takayuki Tsukamoto, Shigenori Tanaka

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


The four-body corrected fragment molecular orbital (FMO4) method was implemented at the second-order Møller-Plesset perturbation (MP2) level. A series of accuracy tests relative to the previous two-body and three-body treatments were performed. As expected, FMO4 provided better accuracy in total energies in comparison with the reference values by regular MO calculations. A nonconventional fragmentation by separating main and side chains in amino acid residues was examined for Ala-pentamer and Chignolin, where the four-body corrections were shown to be substantial. A large complex of HIV-1 protease (total 198 residues) with lopinavir was calculated as well. Furthermore, this new FMO scheme was successfully applied to adamantane-shaped clusters with three-dimensional bonding framework.

Original languageEnglish
Pages (from-to)128-133
Number of pages6
JournalChemical Physics Letters
Publication statusPublished - 2012 Jan 27
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry


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