Monomer-dimer control and crystal engineering in TASPs.
Chemistry
; 18(36): 11409-16, 2012 Sep 03.
Article
en En
| MEDLINE
| ID: mdl-22829435
ABSTRACT
We have reported a template assembled synthetic protein (cavitein Q4) as an unexpected dimer in the solid state and as a monomer-dimer equilibrium in solution. We have since reported an ability to bias a cavitein's monomer-dimer equilibrium in solution by sequence design involving histidine metal chelation or disulfide incorporation. However, little remains known about the forces contributing to dimeric cavitein crystal nucleation and lattice stabilization. We, therefore, designed glutamine variants to probe factors involved in dimeric cavitein crystallization. It was found that a key glutamate hydrogen-bonding interaction between dimers is integral to crystal formation and stabilization. Additionally, we obtained a crystal structure of a cavitein (Q4-E3H) designed to bias the dimeric structure via histidine metal coordination. The resolved structure indicates a histidine cluster interaction that likely accounts for the biased dimeric form observed in solution.
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Ingeniería de Proteínas
/
Proteínas
Tipo de estudio:
Prognostic_studies
Idioma:
En
Revista:
Chemistry
Asunto de la revista:
QUIMICA
Año:
2012
Tipo del documento:
Article