Accuracy of the three-body fragment molecular orbital method applied to Møller-Plesset perturbation theory.
Identifieur interne : 002193 ( PubMed/Corpus ); précédent : 002192; suivant : 002194Accuracy of the three-body fragment molecular orbital method applied to Møller-Plesset perturbation theory.
Auteurs : Dmitri G. Fedorov ; Kazuya Ishimura ; Toyokazu Ishida ; Kazuo Kitaura ; Peter Pulay ; Shigeru NagaseSource :
- Journal of computational chemistry [ 0192-8651 ] ; 2007.
Abstract
The three-body energy expansion in the fragment molecular orbital method (FMO) was applied to the 2nd order Møller-Plesset theory (MP2). The accuracy of both the two and three-body expansions was determined for water clusters, alanine n-mers (alpha-helices and beta-strands) and one synthetic protein, using the 6-31G* and 6-311G* basis sets. At the best level of theory (three-body, two molecules/residues per fragment), the absolute errors in energy relative to ab initio MP2 were at most 1.2 and 5.0 mhartree, for the 6-31G* and 6-311G* basis sets, respectively. The relative accuracy was at worst 99.996% and 99.96%, for 6-31G* and 6-311G*, respectively. A three-body approximation was introduced and the optimum threshold value was determined. The protein calculation (6-31G*) at the production level (FMO2/2) took 3 h on 36 3.2-GHz Pentium 4 nodes and had the absolute error in the MP2 correlation energy of only 2 kcal/mol.
DOI: 10.1002/jcc.20645
PubMed: 17330884
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pubmed:17330884Le document en format XML
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<author><name sortKey="Ishimura, Kazuya" sort="Ishimura, Kazuya" uniqKey="Ishimura K" first="Kazuya" last="Ishimura">Kazuya Ishimura</name>
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<author><name sortKey="Ishida, Toyokazu" sort="Ishida, Toyokazu" uniqKey="Ishida T" first="Toyokazu" last="Ishida">Toyokazu Ishida</name>
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<author><name sortKey="Kitaura, Kazuo" sort="Kitaura, Kazuo" uniqKey="Kitaura K" first="Kazuo" last="Kitaura">Kazuo Kitaura</name>
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<author><name sortKey="Pulay, Peter" sort="Pulay, Peter" uniqKey="Pulay P" first="Peter" last="Pulay">Peter Pulay</name>
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<author><name sortKey="Nagase, Shigeru" sort="Nagase, Shigeru" uniqKey="Nagase S" first="Shigeru" last="Nagase">Shigeru Nagase</name>
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<front><div type="abstract" xml:lang="en">The three-body energy expansion in the fragment molecular orbital method (FMO) was applied to the 2nd order Møller-Plesset theory (MP2). The accuracy of both the two and three-body expansions was determined for water clusters, alanine n-mers (alpha-helices and beta-strands) and one synthetic protein, using the 6-31G* and 6-311G* basis sets. At the best level of theory (three-body, two molecules/residues per fragment), the absolute errors in energy relative to ab initio MP2 were at most 1.2 and 5.0 mhartree, for the 6-31G* and 6-311G* basis sets, respectively. The relative accuracy was at worst 99.996% and 99.96%, for 6-31G* and 6-311G*, respectively. A three-body approximation was introduced and the optimum threshold value was determined. The protein calculation (6-31G*) at the production level (FMO2/2) took 3 h on 36 3.2-GHz Pentium 4 nodes and had the absolute error in the MP2 correlation energy of only 2 kcal/mol.</div>
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<Abstract><AbstractText>The three-body energy expansion in the fragment molecular orbital method (FMO) was applied to the 2nd order Møller-Plesset theory (MP2). The accuracy of both the two and three-body expansions was determined for water clusters, alanine n-mers (alpha-helices and beta-strands) and one synthetic protein, using the 6-31G* and 6-311G* basis sets. At the best level of theory (three-body, two molecules/residues per fragment), the absolute errors in energy relative to ab initio MP2 were at most 1.2 and 5.0 mhartree, for the 6-31G* and 6-311G* basis sets, respectively. The relative accuracy was at worst 99.996% and 99.96%, for 6-31G* and 6-311G*, respectively. A three-body approximation was introduced and the optimum threshold value was determined. The protein calculation (6-31G*) at the production level (FMO2/2) took 3 h on 36 3.2-GHz Pentium 4 nodes and had the absolute error in the MP2 correlation energy of only 2 kcal/mol.</AbstractText>
<CopyrightInformation>Copyright (c) 2007 Wiley Periodicals, Inc.</CopyrightInformation>
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