Binds to the G-box motif (5'-CCACGTGG-3') of the rbcS-1A gene promoter (PubMed:1373374). G-box and G-box-like motifs are cis-acting elements defined in promoters of certain plant genes which are regulated by such diverse stimuli as light-induction or hormone control. Binds to the G-box motif 5'-CACGTG-3' of LHCB2.4 (At3g27690) promoter. May act as transcriptional activator in light-regulated expression of LHCB2.4. Probably binds DNA as monomer. DNA-binding activity is redox-dependent (PubMed:22718771). Monomer and heterodimers with BZIP16 and BZIP68 (PubMed:18315949). Interacts with GIP1 (PubMed:25387999). Found in both light and dark grown leaves. Phosphorylated by CK2. Belongs to the bZIP family.