Abstract
A close examination of the protein sequence encoded by theArabidopsis thalianagene F21M12.26 reveals the gene product to be a phosphomonoesterase, acid optimum (EC 3.1.3.2). A subclass of this broad acid phosphatase is also known as ‘histidine acid phosphatase.’ This is the first sequence-based evidence for a ‘histidine acid phosphatase’ in a dicotyledon. One important member of this class of enzymes isAspergillus niger (ficuum)phytase, which came into prominence for its commercial application as a feed additive. The putative protein fromA. thalianagene F21M12.26 shares many important features ofAspergillusphytase, namely, size, active-site sequence, catalytic dipeptide and ten cysteine residues located in the key areas of the molecule, but lacks all nine N-glycosylation sites.
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