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The NRT2 transporters mediate High Affinity Nitrate/NitriteTransport (HAN/NiT),which are essential for nitrogen acquisition from these inorganic forms. The NRT2 proteins areencoded by a multigene family in plants, and contain 12 transmembrane-spanning domains.Chlamydomonas reinhardtii has six NRT2, two of which (NRT2.5 and NRT2.4) are located inChromosome III, in tandem head to tail. cDNAs for these genes were isolated and their sequencerevealed that they correspond to half-size NRT2 transporters each containing six transmembranedomains. NRT2.5 has long N- and C- termini sequences without known homology. NRT2.4 alsocontains long termini sequences but smaller than NRT2.5. Expression of both studied genes occurredat a very low level, slightly in darkness, and was not modified by the N or C source. Silencingof NRT2.4 by specific artificial miRNA resulted in the inhibition of nitrite transport in the absenceof other HANNiT (NRT2.1/NAR2) in the cell genetic background. Nitrite transport activity in theHansenula polymorpha Dynt::URA3 Leu2 mutant was restored by expressing CrNRT2.4. These resultsindicate that half-size NRT2 transporters are present in photosynthetic organisms and that NRT2.4is a HANiT

NRT2.4 and NRT2.5 Are Two Half-Size Transporters from the Chlamydomonas NRT2 Family