Function
Proline transporter that mediates proline and glycine betaine transport. May be involved in long-distance transport of proline and required for phloem loading, retrieval of proline leaking from the phloem, or in xylem-to-phloem transfer. When expressed in a heterologous system (yeast), imports D- and L-proline, glycine betaine and GABA across the plasma membrane. Has the same affinity for D- and L-proline.
Sequence
MTATEAKNRKINVGDGDDVVDIEIPDTAHQISSDSWFQVAFVLTTGINSAYVLGYSGTIMVPLGWIGGVVGLLIATAISLYANTLIAKLHEFGGRRHIRYRDLAGFIYGRKAYHLTWGLQYVNLFMINCGFIILAGSALKAVYVLFRDDHTMKLPHFIAIAGLICAIFAIGIPHLSALGVWLGVSTFLSLIYIVVAIVLSVRDGVKTPSRDYEIQGSSLSKLFTITGAAANLVFAFNTGMLPEIQATVRQPVVKNMMKALYFQFTAGVLPMYAVTFIGYWAYGSSTSTYLLNSVNGPLWVKALANVSAILQSVISLHIFASPTYEYMDTKYGIKGNPFAIKNLLFRIMARGGYIAVSTLISALLPFLGDFMSLTGAVSTFPLTFILANHMYYKAKNNKLNAMQKLWHWLNVVFFSLMSVAAAIAAVRLIAVDSKNFHVFADL