The characteristic CXC chemokine disulfide core of interleukin-8 (IL-8) has been rearranged in a variant replacing the 9-50 disulfide with a 9-38 disulfide. The new variant has been characterized by its binding affinity to IL-8 receptors A and B and the ...
The characteristic CXC chemokine disulfide core of interleukin-8 (IL-8) has been rearranged in a variant replacing the 9-50 disulfide with a 9-38 disulfide. The new variant has been characterized by its binding affinity to IL-8 receptors A and B and the erythrocyte receptor DARC. This variant binds the three receptors with affinities between 500- and 2,500-fold lower than wild-type IL-8. Binding affinity results are also reported for the variant with alanine substituted for both cysteines 9 and 50. The Glu38-->Cys/Cys50-->Ala IL-8 crystallizes in space group P2(1)2(1)2(1) with cell parameters a = 46.4, b = 49.2, and c = 69.5 A, and has been refined to an R-value of 19.4% for data from 10 to 2 A resolution. Analysis of the structure confirms the new disulfide arrangement and suggests that changes at Ile10 may be the principal cause of the lowered affinities.
Related Citations:
Crystal Structure of Interleukin 8: Symbiosis of NMR and Crystallography Baldwin, E.T., Weber, I.T., Charles, R.St., Xuan, J.C., Appella, E., Yamada, M., Matsushima, K., Edwards, B.F., Clore, G.M., Gronenborn, A.M., al., et (1991) Proc Natl Acad Sci U S A 88: 502
Organizational Affiliation:
Department of Protein Engineering, Genentech, Inc., South San Francisco, California 94080-4990, USA.
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