PPepDB-ID	"Peptide Name"	PMID	"Plant source"	"Plant Family"	"Peptide Family"	"Peptide function"	"Peptide function description"	"Activity against"	Sequence	"Sequence Length"	Validation	"Avg. Molecular wt(Da)"	"Monoisotopic molecular wt(Da)"	pI	Method	"Additional information"
PPepDB_4060	CKX4_ARATH	--NA--	"Arabidopsis thaliana"	Brassicaceae	--NA--	Signaling-peptide	"Alternative splicing; Complete proteome; FAD; Flavoprotein; Glycoprotein; Oxidoreductase; Secreted; Signal | Cytokinin dehydrogenase 4 precursor (EC 1.5.99.12) (Cytokinin oxidase,4) (CKO 4) (AtCKX4).Secreted, extracellular space."	--NA--	AASHDFGNITDENPGAVLCPSSTTEVARLLRFANGGFSYNKGSTSPASTFDDFLRKKIMFDPKRLLSPGQDIFNFPLSDQTRVASLVNDHRIIYVLEVAKYYDRTTLPIIDQVIDTLSRTLGFAGTMWVDVLKAAVDRGVSPVTWTDYLYLSVGGTLSNAGIGGQTFRHGPQISHDGVINGLLLNQTSTSGVTLFYPTNRNKWNNRMSTMTPDEDVFYVIGLLQKVAARGQGHSLRGQASAPGGVVVNMTCLAMAAKPAAVVISADGTYADVAAMTNTLCLSLITLITLFISLTPTLIKSDEGIDVFLPISLNLTVLTDPFSISNVHELDVITGKGEMMTCSPKLNPELFYGVLGGLGQFGIITRARIALDHAPPGFMFVQDVPYFDFLNRVRNEEDKLRSLGLWEVPHPWLNIFVPGSRIQDFSAGGSQNWQELENLNDKVIQFCENSGIKIKEYLMHYTRKEDWVKHFGPKWTRVKWSRILYSDFSAFKRDQERLISMTNDLGVDFLEGQLMMSNGFVDTSF	524	"Experimental evidence at protein level"	58061.32	58024.48	5.85	--NA--	"FUNCTION:Catalyzes the oxidation of cytokinins, a family of N(6)- substituted adenine derivatives that are plant hormones, where the substituent is an isopentenyl group.CATALYTIC ACTIVITY:N(6)-dimethylallyladenine acceptor H(2)O = adenine 3-methylbut-2-enal reduced acceptor.COFACTOR:FAD (By similarity).BIOPHYSICOCHEMICAL PROPERTIES:Kinetic parameters: KM=1.3 uM for isopentenyladenine; Vmax=6.1 nmol/h/mg enzyme;ALTERNATIVE PRODUCTS:Event=Alternative splicing; Named isoforms=1; Comment=A number of isoforms are produced. According to EST sequences; Name=1; IsoId=Q9FUJ2-1; Sequence=Displayed;TISSUE SPECIFICITY:Expressed in trichomes and in developing stomata of young growing leaves. Strong expression in stipules and in the root cap, but not detected in the root meristem.DEVELOPMENTAL STAGE:High expression in stomatal meristemoids, but ceased during the differentiation of guard cells.SIMILARITY:Belongs to the oxygen-dependent FAD-linked oxidoreductase family."