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Volumn 9, Issue 21, 2007, Pages 4191-4194

Self-assembly of okadaic acid as a pathway to the cell

Author keywords

[No Author keywords available]

Indexed keywords

ENZYME INHIBITOR; MARINE TOXIN; OKADAIC ACID; PHOSPHOPROTEIN PHOSPHATASE;

EID: 35548978493     PISSN: 15237060     EISSN: None     Source Type: Journal    
DOI: 10.1021/ol701687m     Document Type: Article
Times cited : (15)

References (22)
  • 1
    • 0039820322 scopus 로고
    • Bioactive Polyethers
    • Scheuer, P. J, Ed, Springer-Verlag: New York
    • Uemura, D. Bioactive Polyethers. In Bioorganic Marine Chemistry; Scheuer, P. J., Ed.; Springer-Verlag: New York, 1991; Vol. 4, pp 1-31.
    • (1991) Bioorganic Marine Chemistry , vol.4 , pp. 1-31
    • Uemura, D.1
  • 8
    • 0001418155 scopus 로고    scopus 로고
    • Sautet, P. Chem. Rev. 1997, 97, 1097-1116.
    • (1997) Chem. Rev , vol.97 , pp. 1097-1116
    • Sautet, P.1
  • 9
    • 0345979435 scopus 로고    scopus 로고
    • Ullman, A. Chem. Rev. 1996, 96, 1533-1554.
    • (1996) Chem. Rev , vol.96 , pp. 1533-1554
    • Ullman, A.1
  • 11
    • 35548986597 scopus 로고    scopus 로고
    • A lipid bilayer was prepared using a solution of L-α- phosphatidylcholine (L-α-lecithin) from soybean (Sigma) in decane Fluka
    • (a) A lipid bilayer was prepared using a solution of L-α- phosphatidylcholine (L-α-lecithin) from soybean (Sigma) in decane (Fluka).
  • 14
    • 35549002603 scopus 로고    scopus 로고
    • We used such an experiment as our control to discard the possibility of OA leaking through the membrane. However, if we use a K+ free inner solution, the system does not resemble by any means a physiological situation; therefore, OA dimers could not exist in that part of the system. In addition, in the proposed experiment, the inner solution would be a nonionic media highly dielectrical, and in this way, the application of an electrical potential would promote a very important ohmic drop across the inner side of the system, preventing the acquisition of reliable results
    • + free inner solution, the system does not resemble by any means a physiological situation; therefore, OA dimers could not exist in that part of the system. In addition, in the proposed experiment, the inner solution would be a nonionic media (highly dielectrical), and in this way, the application of an electrical potential would promote a very important ohmic drop across the inner side of the system, preventing the acquisition of reliable results.
  • 18
    • 35548968801 scopus 로고    scopus 로고
    • Clearly (Figure 4, OA is expected to remain dimeric upon entering cells (even to a higher extent than it is outside, The high affinity of PPl (K i, 145 nM) and PP2A (Ki, 30 pM) for OA suggests that the equilibrium would be shifted to the monomelic form of OA. It should be noted that X-ray structures of the complexes of OA with PP1 and PP2A showed only the monomelic form of OA bound to the proteins. However, as we do not have a value of the self-association constant for OA, we can not quantify how effectively PP1 or PP2A would alter such an equilibrium. We have no results about the effect of K+ on the potency of okadaic acid against PP1 or PP2A, but it appears clear that its presence would not produce any significant modification, as in an in vitro assay the inhibitor would not have to cross the lipid barrier to reach its target, circumventing the need for a dimerization step
    • + on the potency of okadaic acid against PP1 or PP2A, but it appears clear that its presence would not produce any significant modification, as in an in vitro assay the inhibitor would not have to cross the lipid barrier to reach its target, circumventing the need for a dimerization step.
  • 21
    • 35548952639 scopus 로고    scopus 로고
    • This cartoon is only a proposal of the mechanism by which OA could enter into the cell. The existence of more extensive aggregation has been studied in our laboratory, but definitive results need further and detailed research
    • This cartoon is only a proposal of the mechanism by which OA could enter into the cell. The existence of more extensive aggregation has been studied in our laboratory, but definitive results need further and detailed research.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.