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Volumn 126, Issue 38, 2004, Pages 12065-12075

Synthesis, structure, and molecular dynamics of gallium complexes of schizokinen and the amphiphilic siderophore acinetoferrin

Author keywords

[No Author keywords available]

Indexed keywords

HYDROPHILICITY; MOLECULAR DYNAMICS; NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY; PARAMETER ESTIMATION; STRUCTURE (COMPOSITION); SYNTHESIS (CHEMICAL);

EID: 4644329090     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja048145j     Document Type: Article
Times cited : (32)

References (88)
  • 47
    • 4644348930 scopus 로고    scopus 로고
    • note
    • The four-symbol combinations (αααα, αααβ, αγβα, etc.) were used to define the various ring-pucker conformations of GaSz. The label characters reflect orientations of the four groups labeled as i-iv in Figure S25b: left-hand side methylene (i), left-hand side carbonyl (ii), right-hand side carbonyl (iii), and right-hand side methylene (iv) groups, in that order. An additional amide group conformation, "γ", was introduced after we obtained the optimized structures. In that conformation the amide proton was hydrogen-bonded to the uncoordinated citrate central carboxyl oxygen, instead of one of the metal-bound oxygen atoms, as it was in all "αa" and "β" conformations.
  • 53
    • 4644264428 scopus 로고    scopus 로고
    • note
    • The relative GaSz conformation energies were almost the same when calculated with RHF/6-31G(d)//RHF/6-31G(d), RHF/6-31G(d)//B3LYP/6-31G(d), and B3LYP/6-31G(d)//B3LYP/6-31G(d) method combinations for the geometry optimization and the single point energy calculation
  • 62
    • 4644367821 scopus 로고    scopus 로고
    • note
    • 1H NMR resonances were the only signals not reliably assigned to a particular conformation, but it is likely that the ab-quartet centered at δ 2.45 belongs to the conformationally restrained chain I, and the singlet at d 2.55 to the more flexible and equilibrating chain II.
  • 71
    • 4644333462 scopus 로고    scopus 로고
    • note
    • It is clear that the analogue of the Bailar twist mechanism (Figure S27 a and b), if it is not preceded by dissociation of at least one chelating group, cannot be operative in the GaSz epimerization. Such a process requires rotation of all the chelating groups in the same direction, thus minimizing the unfavorable nonbonding interactions in the transition state. Such a process, if applied to the GaSz, would lead to an unstable trans-trans isomer (Figure S27 b). Thus, a nondissociative epimerization of GaSz would require a more complex and energetically prohibitive pathway.
  • 75
    • 4644326589 scopus 로고    scopus 로고
    • note
    • 2O, to the distal part of the molecule further stabilizing the transition state compared to the nondissociative mechanism.
  • 82
    • 4644331340 scopus 로고    scopus 로고
    • note
    • Our preliminary results show rapid paramagnetic NMR line broadening of DMPC choline methyl groups on the interior surface of the DMPC small unilamellar vesicles upon mixing with FeAf solution. This indicates that FeAf is capable of rapidly diffusing across the lipid layers. A further account of these phenomena will be reported elsewhere.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.