1NNS

L-asparaginase of E. coli in C2 space group and 1.95 A resolution

Summary for 1NNS

• Entry DOI: 10.2210/pdb1nns/pdb
• Related: 1AGX 1HFJ 1WSA 3ECA 3PGA
• Descriptor: L-asparaginase II, ASPARTIC ACID (3 entities in total)
• Functional Keywords: l-asparaginase, amidrohydrolase, crystallographic comparison, hydrolase
• Biological source: Escherichia coli
• Cellular location: Periplasm: P00805
• Total number of polymer chains: 2
• Total formula weight: 69519.82

Authors

Sanches, M.,Barbosa, J.A.R.G.,de Oliveira, R.T.,Neto, J.A.A.,Polikarpov, I. (deposition date: 2003-01-14, release date: 2003-03-11, Last modification date: 2024-10-30)

Primary citation

Sanches, M.,Barbosa, J.A.R.G.,de Oliveira, R.T.,Abrahao Neto, J.,Polikarpov, I.
Structural comparison of Escherichia coli L-asparaginase in two monoclinic space groups.
Acta Crystallogr.,Sect.D, 59:416-422, 2003

PubMed Abstract: The functional L-asparaginase from Escherichia coli is a homotetramer with a molecular weight of about 142 kDa. The X-ray structure of the enzyme, crystallized in a new form (space group C2) and refined to 1.95 A resolution, is compared with that of the previously determined crystal form (space group P2(1)). The asymmetric unit of the new crystal form contains an L-asparaginase dimer instead of the tetramer found in the previous crystal form. It is found that crystal contacts practically do not affect the conformation of the protein. It is shown that subunit C of the tetrameric form is in a conformation which is systematically different from that of all other subunits in both crystal forms. Major conformational differences are confined to the lid loop (residues 14-27). In addition, the stability of this globular protein is analyzed in terms of the interactions between hydrophobic parts of the subunits.

PubMed: 12595697
DOI: 10.1107/S0907444902021200

Experimental method

X-RAY DIFFRACTION (1.95 Å)