Abstract
NRT2 family of nitrate transporters normally require a partner protein, NAR2 (nitrate assimilation related protein), to transport nitrate to a high-affinity (high affinity nitrate transport system, HATS), although its role is still not well understood. In this study, the CcNRT2.1 and CcNAR2 cDNAs from of Capsicum chinense were cloned and characterized in terms of their structure, phylogeny, and their organ-specific transcriptional regulation, and by ligh/dark cycle, N and sucrose. CcNRT2.1 (putative molecular mass 57.5 kDa) and CcNAR2 (22.66 kDa) retained the characteristic domains of NRT2 and NAR2 family, respectively. CcNRT2.1 is expressed exclusively in the root, and both western blot and protein immunolocalization, demonstrated its exclusive location in root epidermal and cortical cells. CcNAR2 is expressed mainly in the root, but also in fruits of 25 days post-anthesis (DPA). The presence of two protein bands (~60 and ~80 kDa) detected in the western blot, suggested that CcNRT2.1 monomer and CcNRT2.1/CcNAR2 heterodimer work together for nitrate transport function in roots. Both genes were induced by NO3−, NH4+ and glutamate, and CcNRT2.1 was induced by sucrose. The co-expression of both genes in the specific zone of the root (2–4 cm from the apex) in which the high-affinity nitrate transport occurs (evaluated by root NO3− endogenous content, extracellular pH alkalinization, and H+ net flux by MIFE technique), strongly supports that CcNRT2.1/CcNAR2 belong to a HATS, with a functional similarity to AtNRT2.1/AtNAR2.1 of Arabidopsis. These are the first components of a HATS characterized in the Capsicum genus.
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Abbreviations
- DPA:
-
Days post-anthesis
- HATS:
-
High-affinity transport system
- HTM:
-
Transmembrane helix
- LATS:
-
Low-affinity transport system
- LIX:
-
Liquid ion exchanger
- LR:
-
Lateral root
- MFS:
-
Major facilitator family
- NAR2:
-
Nitrate assimilation related protein 2
- NNP:
-
Nitrate/nitrite porter
- NRT1/PTR:
-
Nitrate transporter 1/peptide transporter family
- NRT2:
-
Nitrate transporter 2
- PR:
-
Primary root
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Acknowledgements
This work was supported by the Consejo Nacional de Ciencia y Tecnología, CONACYT (Project 169041), and CONACYT fellowships to M. G. L. G. (242990) and C. A. E. M. (242989). We thank Ángela Ku González for their kind contribution in work, with confocal microscopy. We thank Federico García Laines for their support in the fruit development experiment for genetic expression. We thank Germán Carnevali Fernández-Concha for his support in the phylogenetic analysis of CcNRT2.1 and CCNAR2 proteins.
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Fig. S1
a cDNA CcNRT2 sequence. In underline are primer sequences used in this work and their names (upper). b Protein CcNRT2 sequence: in red cylinders and numbered are the hydrophobic amino acid segments presumed to form membrane-spanning regions. The protein kinase C recognition motifs (S/T-X-R/K) are overlined. The inverted triangles indicate the two arginine residues corresponding to those required for nitrate transport by an NRT2 homolog (NRTA) of Aspergillus nidulans. The amino acid signatures conserved in the NNP family proteins and NRT2 proteins are highlighted and italics, and cian box, respectively. Red letters indicate the consensus sites of phosphorylation. In bold and underline are probable amino acid residues for the interaction with Nar2 protein in homolog of Arabidopsis and barley. c cDNA CcNAR2 sequence. In underline are primer sequences used in this work and their names (upper). d CcNAR2 sequence: in red cylinder are the hydrophobic amino acid segment presumed to form membrane-spanning region. In yellow box are the amino acids that form the signal peptide. The amino acid signatures conserved in the NAR2 family proteins are highlighted and italics, and purple box. The Forkhead-associated (FHA) domain profile is in a cyan box. Four β (β1- β4) strand in this domain are shown by cyan arrows. In bold, italic, and underline are probable amino acid residues for the interaction with NRT2 protein in homolog of Arabidopsis and barley. The recognition motifs of protein kinase C (S/T-X-R/K) are found with a line at the top. The recognition residues of Casein kinase II (CK2) are in red. The recognition residues for N-glycosylation and N-myristoylation are in blue and pink, respectively. (PNG 1229 kb)
Fig. S2
Predicted transmembrane regions for A) CcNRT2.1 and B) CcNAR2. The prediction of transmembrane helices was made with the bioinformatic program TOPCONS (Tsirigos et al. 2015) (http://topcons.cbr.su.se). (PNG 116 kb)
Fig. S3
In silico CcNRT2-CcNAR2 interaction. (A) CcNRT2 interaction with different protein. StuNRT2 protein of S. tuberosum was used as a reference by STRING 10 program. (B) CcNAR2 interaction with different protein. SlNAR3.2 protein of S. lycopersicum was used as a reference by STRING 10 program. (PNG 894 kb)
Fig. S4
a Extracellular pH analysis by using the Oregon Green® 488 fluorophore. Roots exposed to 0.5 mM KNO3 were used to evaluate the nitrate uptake, indirectly following the alkalinization of the medium with the pH-sensitive Oregon Green® 488 fluorophore. Figure shown a representative image (n = 3 roots). Roots in absence of nitrate were used as control (-NO3−). b Autofluorescence of C. chinense root. Root zones according to the distances from the root apex: Z1 (0–20 mm), Z2 (21–41 mm), and Z3 (42–62 mm). (PNG 614 kb)
Supplemental table S1
Post-translational modifications of CcNRT2.1 and CcNAR2. (XLSX 623 kb)
Supplemental table S2
Accession numbers of NRT2 proteins extracted from GenBank and used for the phylogenetic analysis. (XLSX 16 kb)
Supplemental table S3
Accession numbers of NAR2 proteins extracted from GenBank and used for the phylogenetic analysis. (XLSX 13 kb)
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Lizama-Gasca, M.G., Estrada-Tapia, G., Escalante-Magaña, C.A. et al. Cloning and Molecular Characterization of CcNRT2.1/CcNAR2, a Putative Inducible High Affinity Nitrate Transport System in Capsicum chinense Jacq. Roots. Tropical Plant Biol. 13, 73–90 (2020). https://doi.org/10.1007/s12042-019-09248-w
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DOI: https://doi.org/10.1007/s12042-019-09248-w