1887

Abstract

The simian immunodeficiency virus (SIV) Nef protein contains a consensus Src-homology 3 (SH3) binding motif. However, no SH3-domain proteins showing strong binding to SIV Nef have yet been found, and its potential capacity for high-affinity SH3 binding has therefore remained unproven. Here we have used phage-display-assisted protein engineering to develop artificial SH3 domains that bind tightly to SIV strain mac (SIVmac) Nef. Substitution of six amino acids in the RT loop region of Hck-SH3 with the sequence E/DGWWG resulted in SH3 domains that bound to SIVmac Nef much better than the natural Hck- or Fyn-SH3 domains. These novel SH3 domains also efficiently associated with SIVmac Nef when co-expressed in 293T cells and displayed a strikingly differential specificity when compared with SH3 domains similarly targeted for binding to human immunodeficiency virus type 1 (HIV-1) Nef. Thus, SIVmac Nef is competent for high-affinity SH3 binding, but its natural SH3 protein partners are likely to be different from those of HIV-1 Nef.

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2002-12-01
2019-12-05
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