Abstract
The predominant peroxidase (pl 3.5) (E.C. 1.11.1.7) of an Arabidopsis thaliana cell suspension culture was purified and partially sequenced. Oligonucleotides were designed and a specific probe was obtained. A cDNA clone was isolated from an Arabidopsis cell suspension cDNA library and completely sequenced. The cDNA clone comprised 1194 bp and encodes a 30 residue signal peptide and a 305 residue mature protein ( M r 31 966). The sequence of the mature protein is 95% identical to the well-characterized horseradish peroxidase HRP A2 and has therefore been designated ATP A2. Three introns at positions identical to those found in Arabidopsis and horseradish genes encoding cationic peroxidases were identified. RT-PCR analysis revealed root-specific expression.
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