The Arabidopsis NPR1 Gene That Controls Systemic Acquired Resistance Encodes a Novel Protein Containing Ankyrin Repeats  Hui Cao, Jane Glazebrook, Joseph.

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The Arabidopsis NPR1 Gene That Controls Systemic Acquired Resistance Encodes a Novel Protein Containing Ankyrin Repeats  Hui Cao, Jane Glazebrook, Joseph D Clarke, Sigrid Volko, Xinnian Dong  Cell  Volume 88, Issue 1, Pages 57-63 (January 1997) DOI: 10.1016/S0092-8674(00)81858-9 Copyright © 1997 Cell Press Terms and Conditions

Figure 1 Map of the NPR1 Locus on Chromosome I Six heterozygotes were detected for marker g4026 among the 23 F3 families that were heterozygous at GAP-B, whereas none were found among the seven F3 families that were heterozygous at m315. Therefore, g4026 is 5.92 cM on the centromeric side of the NPR1 gene. For marker g11447, 436 npr1-1 F3 families were tested and 17 heterozygotes were discovered. These heterozygotes were all homozygous Col-0 at the GAP-B locus, indicating that the g11447 marker was 1.95 cM on the telomeric side of the NPR1 gene. No heterozygotes for marker m305 located between g4026 and g11447 were found among the 305 npr1-1 families examined. A YAC contig covering m305 was identified and the left-end fragments of the YAC clones yUP19H6, yUP21A4, and yUP11H9 were used for further mapping. Among the GAP-B recombinants on the centromeric side of the NPR1 gene, five were recombinant (shown as vertical arrows) at the yUP19H6L end-probe. Among the 17 recombinants for g11447 on the telomeric side of the NPR1 gene, one was recombinant at the yUP11H9L end-probe. Since yUP11H9L hybridizes with the yUP19H6 YAC clone, these results showed that the NPR1 gene is located on yUP19H6. The cosmid contig derived from yUP19H6 was shown to contain NPR1 since three recombinants were found using an RFLP marker from cosmid m305-3-1 on the centromeric side of the contig and a single recombinant was detected using a RFLP marker from cosmid g8020-2-3 at the telomeric side of the contig. The 7.5 kb region shared by the complementing cosmids (21A4-4-3-1, 21A4-6-6-1, 21A4-P5-1, 21A4-P4-1, and 21A4-2-1) is indicated by a rectangular box. Cell 1997 88, 57-63DOI: (10.1016/S0092-8674(00)81858-9) Copyright © 1997 Cell Press Terms and Conditions

Figure 2 Phenotypic Analysis of Complementation (A) Northern blot analysis of expression of the PR-1 gene in wild type (Col-0, lanes 1–3), npr1-2 (lanes 4–6), and npr1-2 transformants with a noncomplementing cosmid (m305-2-7, lanes 7–9) and with complementing cosmids (21A4-P5-1, lanes 10–12, and 21A4-6-1-1, lanes 13–15). RNA samples were prepared from 15-day-old seedlings grown on MS media (lanes 1, 4, 7, 10, and 13), MS with 0.1 mM INA (lanes 2, 5, 8, 11, and 14), and MS with 0.1 mM SA (lanes 3, 6, 9, 12, and 15). (B) Disease symptoms (top panels) and BGL2-GUS expression (bottom panels) induced by Psm ES4326 on wild type (left panels), npr1-1 (middle panels), and an npr1-1 transformant with a complementing cosmid (21A4-4-3-1, right panels). Psm ES4326 suspension (OD600 = 0.001, the leaf samples on the left; OD600 = 0.0001, the leaf samples on the right) was infiltrated into the left side of the leaves and symptoms were examined 3 days after infection. GUS staining was carried out according to Jefferson et al. 1987. Cell 1997 88, 57-63DOI: (10.1016/S0092-8674(00)81858-9) Copyright © 1997 Cell Press Terms and Conditions

Figure 3 Deduced Amino Acid Sequence of NPR1 The ankyrin repeats are underlined. Cell 1997 88, 57-63DOI: (10.1016/S0092-8674(00)81858-9) Copyright © 1997 Cell Press Terms and Conditions

Figure 4 Sequence Similarities of NPR1 to Ankyrin (A) Alignment of NPR1 amino acid sequence with mouse ankyrin 3 (ANK3). Two regions producing the highest scoring pairs (smallest sum probability = 0.0004) generated using a BLAST search are shown. The sequence identities between NPR1 (amino acids 323–371 and 262–289) and ANK3 (amino acids 740–788, 313–340) are 42% and 35%, and the sequence similarities are 59% and 57%. The identical and the similar amino acids (+) are highlighted in bold letters. (B) Alignment of the ankyrin repeats in NPR1 with the ankyrin repeat consensus derived by Michaely and Bennett 1992 and by Bork 1993. Since there are a few nonoverlapping amino acids between the two derived consensus sequences, both are presented. In the consensus derived by Bork, the conserved features are indicated: t, turn-like or polar; o, S/T; h, hydrophobic; capitals, conserved amino acids. Those amino acids identical to the consensus are highlighted in bold letters. Cell 1997 88, 57-63DOI: (10.1016/S0092-8674(00)81858-9) Copyright © 1997 Cell Press Terms and Conditions