The spatial structure of the class II L-fuculose-1-phosphate aldolase from Escherichia coli.
The three-dimensional structure of L-fuculose-1-phosphate aldolase (FucA) from Escherichia coli was determined by X-ray crystallography at a resolution of 2.13 A. The enzyme is a homotetramer with an M(r) of 23,775 per subunit. Since its activity depends on the presence of metal ions (Zn2+) the enzyme belongs to the class II aldolases. As expected from amino acid sequence comparisons, this first structure of a class II aldolase shows no similarity to the known structures of class I aldolases. It has some unusual features concerning the overall chain fold, the quaternary structure, and the co-ordination of the catalytically active zinc ion. A sequence comparison with the data bank indicated that the middle domain of the enzyme L-ribulose-5-phosphate-4-epimerase is homologous to FucA and may contain an active-center metal ion.
Institut für Organische Chemie und Biochemie, Albert-Ludwigs-Universität, Freiburg im Breisgau, Germany.
M K
MK
Dreyer
G E
GE
Schulz
D000446:Aldehyde-Lyases / Q000737:chemistry* / Q000378:metabolism; D004926:Escherichia coli / Q000201:enzymology*; D017510:Protein Folding; D014961:X-Ray Diffraction
D000446:Aldehyde-Lyases; C036027:L-fuculosephosphate aldolase