These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: [Complement-inhibiting acidic factors from the venom of Central Asian cobra Naja naja oxiana].
    Author: Shobonov BB, Kozlov LV, Antonov VK.
    Journal: Biokhimiia; 1989 Dec; 54(12):2054-60. PubMed ID: 2633805.
    Abstract:
    Two anticomplementic factors isolated from the venom of the Central Asian cobra Naja naja oxiana by chromatography on DEAE-Sepharose CL-6B and subsequent gel filtration on Sephacryl S-200 were studied. Of these, five factors (CFA-Ia, CFA-Ib, CFA-Ic, CFA-IIa and CFA-IIb), CFA-Ib had been characterized earlier, while CFA-Ia was assigned to a previously identified H-CoF factor. It was shown that CFA-Ic has a molecular mass of 3900 Da; its content in the venom amounts to 2.6 mg/g of dry venom. This factor inhibits the classical pathway of C3 convertase formation abrogating the C2 component activation by subcomponent C1s [Ki = (2.5 +/- 0.8).10(-7) M]. CFA-IIa and CFA-IIb are present in the venom in very low amounts (2 mg/g) and have Mr of 5700 and 3200 Da, respectively. The complement-inhibiting action was studied for a more active CFA-IIa. Factor CFA-IIa was shown to inactivate the native component of C2 with a rate constant, k, of (2.7 +/- 0.2).10(3) s-1M-1 (37 degrees C, pH 7.4). CFA-IIa had no effect on C2 and C2a within their complexes with C4b.
    [Abstract] [Full Text] [Related] [New Search]