Cloning and some properties of Japanese pear (Pyrus pyrifolia) polyphenol oxidase, and changes in browning potential during fruit maturation
Cloning and some properties of Japanese pear (Pyrus pyrifolia) polyphenol oxidase, and changes in browning potential during fruit maturation
Nishimura, M.; Fukuda, C.; Murata, M.; Homma, S.
Journal of the Science of Food and Agriculture 83(11): 1156-1162
2003
ISSN/ISBN: 0022-5142
DOI: 10.1002/jsfa.1518
A PCR-amplified genomic DNA fragment encoding Japanese pear (P. pyrifolia) polyphenol oxidase (PPO) was cloned and sequenced. The DNA appears to encode a 66 kDa precursor protein consisting of a 56 kDa mature protein and a 9.5 kDa N-terminal transit peptide. The amino acid sequence showed high homology with apple PPO. The PPO mainly existed as a soluble fraction in cells and was limitedly proteolysed, while the mature form (56 kDa) was detected in plastids.