1UL3

Crystal Structure of PII from Synechocystis sp. PCC 6803

Summary for 1UL3

• Entry DOI: 10.2210/pdb1ul3/pdb
• Related: 1hwu 2pii
• Descriptor: Nitrogen regulatory protein P-II, GLYCEROL, CALCIUM ION, ... (4 entities in total)
• Functional Keywords: nitrogen regulation, cyanobacteria, signaling protein
• Biological source: Synechocystis sp.
• Total number of polymer chains: 4
• Total formula weight: 49925.84

Authors

Xu, Y.,Carr, P.D.,Clancy, P.,Garcia-Dominguez, M.,Forchhammer, K.,Florencio, F.,Tandeau de Marsac, N.,Vasudevan, S.G.,Ollis, D.L. (deposition date: 2003-09-09, release date: 2003-12-16, Last modification date: 2023-10-25)

Primary citation

Xu, Y.,Carr, P.D.,Clancy, P.,Garcia-Dominguez, M.,Forchhammer, K.,Florencio, F.,Vasudevan, S.G.,Tandeau de Marsac, N.,Ollis, D.L.
The structures of the PII proteins from the cyanobacteria Synechococcus sp. PCC 7942 and Synechocystis sp. PCC 6803.
Acta Crystallogr.,Sect.D, 59:2183-2190, 2003

PubMed Abstract: 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 flexible in solution and that this flexibility may be important for receptor recognition. Sequence comparisons are used to identify regions of the sequence unique to the cyanobacteria.

PubMed: 14646076
DOI: 10.1107/S0907444903019589

Experimental method

X-RAY DIFFRACTION (2 Å)