The structure of the type I fructose 1,6-bisphosphate aldolase from human muscle has been extended from 3 A to 2 A resolution. The improvement in the resulting electron density map is such that the 20 or so C-terminal residues, known to be associated with activity and isozyme specificity, have been located ...
The structure of the type I fructose 1,6-bisphosphate aldolase from human muscle has been extended from 3 A to 2 A resolution. The improvement in the resulting electron density map is such that the 20 or so C-terminal residues, known to be associated with activity and isozyme specificity, have been located. The side-chain of the Schiff's base-forming lysine 229 is located towards the centre of an eight-stranded beta-barrel type structure. The C-terminal "tail" extends from the rim of the beta-barrel towards lysine 229, thus forming part of the active site of the enzyme. This structural arrangement appears to explain the difference in activity and specificity of the three tissue-specific human aldolases and helps with our understanding of the type I aldolase reaction mechanism.
Related Citations:
The Crystal Structure of Human Muscle Aldolase at 3.0 Angstroms Resolution Gamblin, S.J., Cooper, B., Millar, J.R., Davies, G.J., Littlechild, J.A., Watson, H.C. (1990) FEBS Lett 262: 282
Molecular Architecture of Rabbit Skeletal Muscle Aldolase at 2.7-Angstroms Resolution Sygusch, J., Beaudry, D., Allaire, M. (1987) Proc Natl Acad Sci U S A 84: 7846
The Low-Resolution Structure of Human Muscle Aldolase Millar, J.R., Shaw, P.J., Stammers, D.K., Watson, H.C. (1981) Philos Trans R Soc London,ser B 292: 209
Organizational Affiliation:
Department of Biochemistry, School of Medical Sciences, University of Bristol, U.K.
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