Figure 4.

Predicted Structure of NRB4.

(A) Drawing of the predicted NRB4 protein, showing the conserved KIX domain and the region rich in Gln. AA, amino acids.

(B) Magnification of the KIX domain, showing the introns (horizontal lines), the point mutations (arrows), and the T-DNA insertions (triangles) found in NRB4 (At1g15780). The number above the mutation indicates the number of alleles. Only a section of the NRB4 gene is shown; the region shown corresponds to the gray rectangle in (A).

(C) Sequence of the first 100 amino acids of NRB4, indicating the point mutations.