Nucleoside transporter involved in adenosine transport and required for nucleotide metabolism which influences growth and pollen germination. Has high affinity for adenosine when expressed in a heterologous system (yeast). Tonoplast. In young seedlings, expressed in root elongation zone, root cortex, root-hair, at the transition to the shoot and cotyledons. Expressed in hydathodes of fully developed leaves and pollen. By nitrogen deficiency and 5-fluorouracil plus methotrexate. Plants over-expressing ENT1 have decreased leaf content of adenosine and show growth deficiencies. Plants silencing ENT1 have increased leaf content of adenosine and decreased rate of pollen germination. Belongs to the SLC29A/ENT transporter (TC 2.A.57) family. Truncated N-terminus.