Figure 1.

SOX2 homology, structure and protein function. (A) SOX2 belongs to the SOXB1 of SOX proteins. There is large homology between the SOXB1 group and they all contain three major domains: N-terminal, HMG and C-terminal domain. (B) SOX2 protein domains play several functional roles. The HMG domain of SOX2 remains fairly conserved between homo sapiens, Mus musculus and Danio rerio (Swiss-Prot: P48431, P48432, Q6P0E1). The HMG domain also serves as potential binding sites for protein partners. Moreover, nuclear import signals (NIS) and nuclear export signals (NES) bind to the HMG domain regulating SOX2 itself. Lastly the transactivation domain functions as the region responsible for promoter binding, which in turn leads to activation or repression of target genes.