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spinqualitylabelsall models 1mli, resolution 3.3Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image

CRYSTAL STRUCTURE OF MUCONOLACTONE ISOMERASE AT 3.3 ANGSTROMS RESOLUTION

Overview

The crystal structure of muconolactone isomerase from Pseudomonas putida, a unique molecule with ten 96 amino acid subunits and 5-fold, and 2-fold symmetries, has been solved at 3.3 A resolution. The non-crystallographic symmetries were used to refine the initial single isomorphous replacement phases and produce an interpretable 10-fold averaged map. The backbone trace is complete and confirmed by the amino acid sequence fit. Each subunit is composed of a body with two alpha-helices and an antiparallel twisted beta-sheet of four strands, and an extended arm. The helices and the sheet fold to form a two-layered structure with an enclosed hydrophobic core and a partially formed putative active site pocket. The C-terminal arm of another subunit related by a local dyad symmetry extends over the core to complete this pocket. The decameric protein is almost spherical, with the helices forming the external coat. There is a large hydrophilic cavity in the center with open ends along the 5-fold axis. Molecular interactions between subunits are extensive. Each subunit contacts four neighbors and loses nearly 40% of its solvent contact area on oligomerization.

About this Structure

1MLI is a Single protein structure of sequence from Pseudomonas putida. Active as Muconolactone Delta-isomerase, with EC number 5.3.3.4 Full crystallographic information is available from OCA.

Reference

Crystal structure of muconolactone isomerase at 3.3 A resolution., Katti SK, Katz BA, Wyckoff HW, J Mol Biol. 1989 Feb 5;205(3):557-71. PMID:2926818

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