Structure of an interleukin-1 beta mutant with reduced bioactivity shows multiple subtle changes in conformation that affect protein-protein recognition.Camacho, N.P., Smith, D.R., Goldman, A., Schneider, B., Green, D., Young, P.R., Berman, H.M.
(1993) Biochemistry 32: 8749-8757
- PubMed: 8364024
- DOI: https://doi.org/10.1021/bi00085a005
- Primary Citation of Related Structures:
- PubMed Abstract:
Site-specific mutagenesis was used to obtain the human interleukin-1 beta mutant protein with glycine substituted for threonine at position 9 (IL-1 beta Thr9Gly). The mutant maintains receptor binding but exhibits significantly reduced biological activity. The crystal structure of IL-1 beta Thr9Gly has been determined at 2.4-A resolution by molecular replacement techniques and refined to a crystallographic R-factor of 19.0%. IL-1 beta Thr9Gly crystallizes in a different space group (P6(5)22) than does native IL-1 beta (P4(3)); thus the molecules pack differently. Their overall structure is similar, nevertheless, with both composed of 153 amino acids which form 12 antiparallel beta-strands. However, significant conformational differences both close to and far from the site of the mutation may explain the mutant's altered properties.
Department of Chemistry, Rutgers University, New Brunswick, New Jersey 08903.