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Volumn 122, Issue 23, 2000, Pages 5613-5622

Molecular dynamics study of HIV-1 protease-substrate complex: Roles of the water molecules at the loop structures of the active site

Author keywords

[No Author keywords available]

Indexed keywords

ASPARTIC ACID; PROTEINASE; PROTEINASE INHIBITOR; VIRUS RNA; WATER;

EID: 0034647235     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja9929178     Document Type: Article
Times cited : (40)

References (40)
  • 3
    • 0002038716 scopus 로고
    • Neuberger, A., Brocklehurst, K., Eds.; Elsevier: New York
    • Fruton, J. S. In Hydrolytic Enzyme; Neuberger, A., Brocklehurst, K., Eds.; Elsevier: New York, 1987; pp 1-37.
    • (1987) Hydrolytic Enzyme , pp. 1-37
    • Fruton, J.S.1
  • 13
    • 0342586248 scopus 로고    scopus 로고
    • note
    • The early studies on the mechanism of aspartic proteases proposed that the unprotonated Asp residue attacked on the scissile bond of the substrate, so that a covalently bound intermediate complex between the enzyme and the substrate was formed. However, the intermediate complex has not been supported by the experimental evidence.
  • 15
    • 0343891878 scopus 로고    scopus 로고
    • note
    • The possibility of the mechanism of Scheme 2 is still under study with quantum chemical calculations.
  • 32
    • 0343891855 scopus 로고    scopus 로고
    • note
    • In the current study, the four hydrogen bonds involving WAT00 were formed in MD simulations. But the hydrogen bond of Pro106 N-WAT00 was weaker than the other hydrogen bonds. It is considered that this is due to the length of substrate which consists of seven (P4-P3′) residues, since P1′-P3′ residues are more mobile than P1-P4 residues. Accordingly, the MD simulation on large substrate will be a future subject.
  • 33
    • 0343456101 scopus 로고    scopus 로고
    • note
    • Throughout MM minimizations and MD simulations on the structures in Table 1 (structures 3-7). the respective spaces of the deleted crystal water molecules (spaces 0-4) have been confirmed to be unoccupied by other water molecules supplied in the solvent generation.
  • 34
    • 0343891834 scopus 로고    scopus 로고
    • note
    • WAT00 also occupied space 0 during the 100-ps MD simulations.
  • 35
    • 0342586219 scopus 로고    scopus 로고
    • note
    • The system was solvated in a rectangular box (whose size is approximately 90 A° × 71 A° × 62 A°) and 11080 TIP3P water molecules were generated in the box. In the PME system, a charge grid of 89 × 70 × 60 gridpoints was used with a spacing of approximately 1 A for the gridpoints. The periodic boundary condition was applied and the pressure was kept constant in the system. The temperature was kept constant according to the Berendsen algorithm with a coupling time of 0.2 ps. The cutoff distance of the nonbonded term was 14 A°. An integration time step of the MD simulations was 0.5 fs. See the Methods section in the text for other details on the calculation.
  • 36
    • 0343891848 scopus 로고    scopus 로고
    • note
    • In addition, we carried out the MD simulations with use of the cutoff technique (18 A). The initial structure of the ES complex was placed in a box filled with approximately 6430 TIP3P water molecules. A box the size of approximately 80 A° × 60 Å × 51 A° was chosen. The periodic boundary condition was applied. The pressure was kept constant in the system and the temperature was kept constant according to the Berendsen algorithm with a coupling time of 0.2 ps. An integration time step of the MD simulations was 0.5 fs. The MD simulations of seven structures shown in Table 1 indicated that the ES complex could not maintain the active conformation. It is not considered that this cutoff distance (18 A°) is long enough for representation of the maintenance of the active conformation. See the Methods section in the text for other details of the calculation.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.