Download MendeleyThe X-ray structures of two mutant crystallin domains shed light on the evolution of multi-domain proteins.
Norledge, B.V., Mayr, E.M., Glockshuber, R., Bateman, O.A., Slingsby, C., Jaenicke, R., Driessen, H.P.(1996) Nat Struct Biol 3: 267-274
- PubMed: 8605629
- DOI: https://doi.org/10.1038/nsb0396-267
- Primary Citation of Related Structures:
1DSL, 1GAM - PubMed Abstract:
We use protein engineering and crystallography to simulate aspects of the early evolution of beta gamma-crystallins by observing how a single domain oligomerizes in response to changes in a sequence extension. The crystal structure of the C-terminal domain of gamma beta-crystallin with its four-residue C-terminal extension shows that the domain does not form a symmetric homodimer analogous to the two-domain pairing in beta gamma-crystallins. Instead the C-terminal extension now forms heterologous interactions with other domains leading to the solvent exposure of the natural hydrophobic interface with a consequent loss in protein solubility. However, this domain truncated by just the C-terminal tyrosine forms a symmetric homodimer of domains in the crystal lattice.
Organizational Affiliation:
Department of Crystallography, Birkbeck College, London, UK.
