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_4127	PME4_ARATH	--NA--	"Arabidopsis thaliana"	Brassicaceae	--NA--	Signaling-peptide	"Aspartyl esterase; Cell wall; Cell wall biogenesis/degradation; Complete proteome; Glycoprotein; Hydrolase; Secreted; Signal | Pectinesterase-4 precursor (EC 3.1.1.11) (Pectin methylesterase 4) (PE,4) (VANGUARD1-like protein 1) (VGD1-like protein 1) (AtPME4)."	--NA--	ADRKLMAKAGRGRRGGRGGGARVRTNFVVAKDGSGQFKTVQQAVDACPENFDGYQDTLYVNNGRQFYRNCVVSGTVDFIFGKSATVIQNTLIVVRKGSKGFSTTVIMSTEMGDLIRPEGWKIWDGESFHKSCRYVEYNNRGPGAFANRRVKASCVKTLEPVKSEDPNKLIKAFMLATKDELTKSSNFTGQTEVNMGSSISMIGKVVVSVASILLIVGVAIGVVAFINKNGDANLSPQMKAVQGICQSTSDNRGRCIIYIKAGLYREQVIIPKKKNNIFMFGDGARKTVISYNRSVALSRGNWAKVARSAAEVNGFTAANWLGPINWIQEANVPVTIGLNYQTDCLDDIEEDDLRKAIGEGIANSKILTTNAIDIFHTVVSAMAKINNKPNNKAVLDYCKRVFMYALEDLATIIEEMGEDLSQIGSKIDQLKQWLIGVYQYNTVTADGNELGLGMKIGIVLQNCRIVPDRKLTPERLTVATYLGRPWKKTTTSLSATVQVESEGFMAKWMGFKNTAGPMGHQAAAIRVNGDRAVIFNCRVDDLKNMTGGIPTPGAPPVVDESPVADPDGPARRLLEDIDETGIPTWVSG	588	"Experimental evidence at transcript level"	64137.51	64096.91	9.17	--NA--	"FUNCTION:Acts in the modification of cell walls via demethylesterification of cell wall pectin. Plays an important role in growth of pollen tubes in female floral tissues, possibly via enhancing the interaction between the pollen tube and female floral tissues by modification of the cell walls.CATALYTIC ACTIVITY:Pectin n H(2)O = n methanol pectate.TISSUE SPECIFICITY:Expressed specifically in pollen grains and pollen tubes.SIMILARITY:Belongs to the pectinesterase family.SEQUENCE CAUTION:Sequence=AAN15509.1; Type=Miscellaneous discrepancy; Note=Probable cloning artifact leading to a large internal deletion; "