Figure 1.

The Type-B Response Regulator 10 (ARR10).

(A) The structural design of ARR10, a member of the type-B ARR family, is shown schematically compared with those of three other plant proteins (LHY, CCA1, and Myb-like) and the classic mouse c-Myb oncoprotein. The B motif is similar in length and primary sequence to the Myb repeat of c-Myb and the Myb-related domains of the plant proteins. Two truncated polypeptides were used in this study: ARR10-B, corresponding to the B motif of ARR10; and ARR10-RB, containing both the phospho-accepting receiver domain and the B motif.

(B) Amino acid sequences of the B motifs of the type-B ARRs and the corresponding motifs of other GARP proteins. These sequences are compared with those of the plant Myb-related domains and mouse Myb repeats of the proteins listed in (A), and the conserved amino acids are highlighted.