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2.A.67.1.7
Oligopeptide transporter 3, Opt3, of 737 aas and 15 - 17 TMSs (Koh et al. 2002).  It may be involved in the translocation of tetra- and pentapeptides across the cellular membrane, but it also acts as a metal transporter as a component capable of transporting Fe2+ and/or Cu2+ (Wintz et al. 2003). It is essential for early embryo development in Arabidopsis (Stacey et al. 2002). OPT3 proteins are involved in ROS regulation, plant stress responses, and basal pathogen resistance. The transport of iron through OPT3s may occur with glutathione (GSH) (Kurt 2021).  

Accession Number:O23482
Protein Name:Oligopeptide transporter 3
Length:737
Molecular Weight:82441.00
Species:Arabidopsis thaliana (Mouse-ear cress) [3702]
Number of TMSs:15
Location1 / Topology2 / Orientation3: Membrane1 / Multi-pass membrane protein2
Substrate iron(2+)

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Predict TMSs (Predict number of transmembrane segments)
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FASTA formatted sequence
1:	MDAEKATDKT NVHLSSDHER CPVEEVALVV PETDDPSLPV MTFRAWFLGL TSCVLLIFLN 
61:	TFFTYRTQPL TISAILMQIA VLPIGKFMAR TLPTTSHNLL GWSFSLNPGP FNIKEHVIIT 
121:	IFANCGVAYG GGDAYSIGAI TVMKAYYKQS LSFICGLFIV LTTQILGYGW AGILRRYLVD 
181:	PVDMWWPSNL AQVSLFRALH EKENKSKGLT RMKFFLVALG ASFIYYALPG YLFPILTFFS 
241:	WVCWAWPNSI TAQQVGSGYH GLGVGAFTLD WAGISAYHGS PLVAPWSSIL NVGVGFIMFI 
301:	YIIVPVCYWK FNTFDARKFP IFSNQLFTTS GQKYDTTKIL TPQFDLDIGA YNNYGKLYLS 
361:	PLFALSIGSG FARFTATLTH VALFNGRDIW KQTWSAVNTT KLDIHGKLMQ SYKKVPEWWF 
421:	YILLAGSVAM SLLMSFVWKE SVQLPWWGML FAFALAFIVT LPIGVIQATT NQQPGYDIIG 
481:	QFIIGYILPG KPIANLIFKI YGRISTVHAL SFLADLKLGH YMKIPPRCMY TAQLVGTVVA 
541:	GVVNLGVAWW MLESIQDICD IEGDHPNSPW TCPKYRVTFD ASVIWGLIGP RRLFGPGGMY 
601:	RNLVWLFLIG AVLPVPVWAL SKIFPNKKWI PLINIPVISY GFAGMPPATP TNIASWLVTG 
661:	TIFNYFVFNY HKRWWQKYNY VLSAALDAGT AFMGVLLFFA LQNAGHDLKW WGTEVDHCPL 
721:	ASCPTAPGIK AKGCPVF