Artículo
The structures of the PII proteins from the cyanobacteria Synechococcus sp. PCC 7942 and Synechocystis sp. PCC 6803
Autor/es | Xu, Yibin
Carr, Paul D. Clancy, Paula García Domínguez, Mario Forchhammer, Karl Florencio Bellido, Francisco Javier Tandeau De Marsac, Nicole |
Departamento | Universidad de Sevilla. Departamento de Bioquímica Vegetal y Biología Molecular |
Fecha de publicación | 2003 |
Fecha de depósito | 2017-04-11 |
Publicado en |
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Resumen | The PII proteins from the cyanobacteria Synechococcus sp.
PCC 7942 and Synechocystis sp. PCC 6803 have been
crystallized and high-resolution structures have been obtained
using X-ray crystallography. The core of these ... The PII proteins from the cyanobacteria Synechococcus sp. PCC 7942 and Synechocystis sp. PCC 6803 have been crystallized and high-resolution structures have been obtained using X-ray crystallography. The core of these new structures is similar to that of the PII proteins from Escherichia coli, although the structures of the T- and C-loops differ. The T-loop of the Synechococcus protein is ordered, but appears to be stabilized by crystal contacts. The same loop in the Synechocystis protein is disordered. The C-terminus of the Synechocystis protein is stabilized by hydrogen bonding to the same region of a crystallographically related molecule. The same terminus in the Synechococcus protein is stabilized by coordination with a metal ion. These observations are consistent with the idea that both the T-loop and the C-terminus of PII proteins are ¯exible in solution and that this ¯exibility may be important for receptor recognition. Sequence comparisons are used to identify regions of the sequence unique to the cyanobacteria. |
Cita | Xu, Y., Carr, P.D., Clancy, P., García Domínguez, M., Forchhammer, K., Florencio Bellido, F.J. y Tandeau De Marsac, N. (2003). The structures of the PII proteins from the cyanobacteria Synechococcus sp. PCC 7942 and Synechocystis sp. PCC 6803. Acta Crystallographica Section D: Biological Crystallography, 59 (12), 2183-2190. |
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