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Molecular Biology and Evolution, Vol 3, 366-373, Copyright © 1986 by Society for Molecular Biology and Evolution

ORIGINAL ARTICLE

Differences in specificity and catalytic efficiency between allozymes of esterase-4 from Drosophila mojavensis

J Pen, A Schipper, HA Rongen and JJ Beintema
Biochemical Laboratory, Rijksuniversiteit Groningen, The Netherlands.

A more than 10-fold difference in the specificity and catalytic efficiency for 1-naphthyl esters was measured between two allozymes of esterase-4 from Drosophila mojavensis. This difference is mainly caused by a difference in the affinity for the 1-naphthyl esters. The amino acid compositions of the allozymes are not significantly different, which means that the difference in primary structure is small. Small differences in primary structure generally do not result in such a large increase in catalytic efficiency and such a large shift in substrate specificity as was found in the present study.
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