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Volumn 109, Issue 8, 2005, Pages 3606-3615

Calculating absorption shifts for retinal proteins: Computational challenges

Author keywords

[No Author keywords available]

Indexed keywords

COMPLETE ACTIVE SPACE SELF-CONSISTENT FIELD (CASSCF); PROTONATED SCHIFF BASE (PSB); RETINAL PROTEINS; RHODOPSIN; TIME-DEPENDENT DENSITY FUNCTIONAL THEORY (TDDFT);

EID: 14844348202     PISSN: 15206106     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp0463060     Document Type: Article
Times cited : (232)

References (69)
  • 33
    • 0003845334 scopus 로고    scopus 로고
    • University of Karlsruhe: Karlsruhe, Germany
    • TURBOMOLE, version 5.6; University of Karlsruhe: Karlsruhe, Germany, 2002.
    • (2002) TURBOMOLE, Version 5.6
  • 62
    • 14844357401 scopus 로고    scopus 로고
    • note
    • Starting from canonical RHF Orbitals and improved virtual orbitals (IVO), we performed an initial MRCI (difference-dedicated CI type 2) calculation to obtain state-averaged (over three roots) natural orbitals.
  • 63
    • 14844353488 scopus 로고    scopus 로고
    • note
    • a atoms with a distance to the chromophore larger than 12 Å were harmonically restrained in their original positions. We used no QM/MM cutoff and extended electrostatics for the MM nonbonded interaction.
  • 64
    • 14844347193 scopus 로고    scopus 로고
    • note
    • 1 energies (1.96,2.12, and 1.78 eV, respectively) are 0.34-0.38 eV lower than their OM2 counterparts. The lack of triple excitations in CISD compensates for the lower energies yielding a PM3/CISD value close to the OM2/MRCI value (2.16 eV).
  • 65
    • 14844357070 scopus 로고    scopus 로고
    • note
    • 1.
  • 66
    • 14844351459 scopus 로고    scopus 로고
    • note
    • Such qualitative structural changes when treating the counterion quantum mechanically do not occur in our DFTB/CHARMM approach. We observe merely a small approach of the counterion which causes an insignificant shift
  • 67
    • 14844343931 scopus 로고    scopus 로고
    • note
    • 1, including the counterion within the QM region, is presented in the Supporting Information.
  • 68
    • 14844347505 scopus 로고    scopus 로고
    • note
    • i excitation, as obtained from SORCI or OM2/MRCI, increases with the BLA of the underlying chromophore structure. This phenomenon can be understood in terms of VB analysis as a stabilization of the covalent resonance structure (versus the ionic one).
  • 69
    • 14844353803 scopus 로고    scopus 로고
    • note
    • 61 (PDB entry IBRX). The RMSD from our structure is 1.39 Å (backbone only).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.