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C5b-9 assembly: average binding of one C9 molecule to C5b-8 without poly-C9 formation generates a stable transmembrane pore.

S Bhakdi and J Tranum-Jensen
J Immunol April 15, 1986, 136 (8) 2999-3005;
S Bhakdi
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J Tranum-Jensen
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Abstract

Membrane attack by serum complement normally results in the formation of C5b-9 complexes that are heterogeneous with respect to their C9 content. We here report that an apparently homogeneous population of C5b-9 complexes can be generated through treatment of C5b-7-laden sheep erythrocytes with C8 and C9 for 60 min at 0 degree C. Experiments performed by using radioiodinated C8 and C9 components have indicated that binding of C8 to these target cells is essentially temperature independent. In contrast, when a surplus of C9 molecules is offered to C5b-8 cells, an approximately fourfold to 4.5-fold higher number of C9 molecules become cell bound at 37 degrees C as opposed to 0 degree C. C5b-9 complexes isolated from target membranes treated with C9 at 0 degree C contain no polymerized C9 and do not exhibit the ring structure characteristic of the classical complement lesion. Nevertheless, these complexes generate stable transmembrane channels and cause hemolysis at 37 degrees C. The pores have been sized to 1 to 3 nm effective diameter by osmotic protection experiments. SDS-PAGE of the isolated complexes indicates an average stoichiometry of only one molecule C9 bound per C5b-8 complex. The results show that oligomerization of C9 with formation of ring lesions is not a basic requirement for the generation of stable transmembrane complement pores in sheep erythrocytes. They indirectly support the contention that terminal complement components other than C9 contribute to the intramembrane domains of C5b-9 pores.

  • Copyright © 1986 by American Association of Immunologists

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The Journal of Immunology
Vol. 136, Issue 8
15 Apr 1986
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C5b-9 assembly: average binding of one C9 molecule to C5b-8 without poly-C9 formation generates a stable transmembrane pore.
S Bhakdi, J Tranum-Jensen
The Journal of Immunology April 15, 1986, 136 (8) 2999-3005;

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C5b-9 assembly: average binding of one C9 molecule to C5b-8 without poly-C9 formation generates a stable transmembrane pore.
S Bhakdi, J Tranum-Jensen
The Journal of Immunology April 15, 1986, 136 (8) 2999-3005;
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Print ISSN 0022-1767        Online ISSN 1550-6606