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PPO

Gene
ppo
Protein
Phenoloxidase subunit 2
Organism
Manduca sexta
Length
695 amino acids
Function
This is a copper-containing oxidase that functions in the formation of pigments such as melanins and other polyphenolic compounds. Catalyzes the rate-limiting conversions of tyrosine to DOPA, DOPA to DOPA-quinone and possibly 5,6 dihydroxyindole to indole-5'6 quinone. Binds to the surface of hemocytes and is involved in hemocyte melanization.
Similarity
Belongs to the tyrosinase family.
Mass
80.061 kDa
Sequence
MADIFDSFELLYDRPGEPMINTKGEDKVLFELTEQFLTPEYANNGLELNNRFGDEEEVSRKIILKNLDKIPEFPKAKQLPNDADFSLFLPSHQEMANEVIDVLMSVTENQLQELLSTCVYARINLNPQLFNYCYTVAIMHRRDTGKVRVQNYAEIFPAKFLDSQVFTQAREAAAVIPKTIPRTPIIIPRDYTATDLEEEHRLAYWREDLGINLHHWHWHLVYPFSASDEKIVAKDRRGELFFYMHQQIIARYNCERLCNSLKRVKKFSDWREPIPEAYYPKLDSLTSARGWPPRQAGMRWQDLKRPVDGLNVTIDDMERYRRNIEEAIATGNVILPDKSTKKLDIDMLGNMMEASVLSPNRDLYGSIHNNMHSFSAYMHDPEHRYLESFGVIADEATTMRDPFFYRVHAWVDDIFQSFKEAPHNVRPYSRSQLENPGVQVTSVAVESAGGQQNVLNTFWMQSDVNLSKGLDFSDRGPVYARFTHLNHRPFRYVIKANNTASARRTTVRIFIAPKTDERNLPWALSDQRKMFIEMDRFVVPLSAGENTITRQSTESSLTIPFEQTFRDLSIQGSDPRRSELAAFNYCGCGWPQHMLVPKGTVGGVAYQLFVMLSNYELDKIEQPDGRELSCVEASMFCGLKDKKYPDARPMGYPFDRPSNSATNIEDFSAMSNMGLQDIVIKLSDVTEPNPRNPPA

Gene
PPO
Protein
Polyphenol oxidase latent form, chloroplastic
Organism
Prunus armeniaca
Length
597 amino acids
Function
Polyphenol oxidase active form, chloroplastic: Catalyzes the oxidation of mono- and o-diphenols to o-diquinones. Uses preferentially 4-methylcatechol and chlorogenic acid as substrates, followed by caffeic acid, pyrogallol, and catechol, but barely active toward dopamine and L-dopa. No activity detected with monophenols (e.g. phenol and tyramine).
Similarity
Belongs to the tyrosinase family.
Mass
67.133 kDa
Sequence
MATAPSPTTMGTYSSLISTNSFSTFLPNKSQLSLSGKSKHYVARRSSISCKATNNNNSNNQNEQQEESSRLLGKLDRRNILIGLGGLYGATTLDRKPFAFADPIAPPDLTTCKPAEITPGGSETVPCCPPVTTKIKTFKPDLSIPLRTSPAAHQVTDEYLAKFKKAQAAMRALPDDDPRSMVQQAKVHCAYCNGAYPQVGFTDNDIQVHFSWLFFPFHRMYLYFYERILGKLIDDPTFALPYWNWDSPVGFPIPDIYTDTSSPLYDQYRNADHQPPVLVDLSYGGKDDDVDEQTRIDENLAIMYRQMVSGAKTPDLFFGHAYRAGNLNTGKYPGTIENMPHNNIHIWVGDPSQTHQEDMGNFYSAGRDPLFYAHHANVDRMWNIWKTLGGKRKDITDTDWLDAEFLFYDENAELVRVKVRDSLEPEKQLRYNYEPVSLPWLFTKPTARKTKNKTKAKVAATQLTSKFPATLVEVTTVEVARPKPRKRSKKEKVDEEELLIIKDIEFEGTEAVKFDVFINDDAESLSRRDKSEFAGSFVHVPQGKTTKAKTKTNLKLGITDLLEDLGAEDDSSVLVTLVPRVSNSPITIGGFKIEYSS