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Drosophila  GCM (glial cell missing) is a novel DNA-binding protein that determines the fate of glial precursors from the neural default to glia. The GCM protein contains the functional domain that is essential for recognition of the upstream sequence of the  repo  gene. In the DNA-binding region of this GCM protein, there is a cysteine-rich region with which divalent metal ions such as Zn 2+  must bind and other proteins belonging to the GCM family have a corresponding region. To obtain a more detailed insight into the structural and functional features of this DNA-binding region, we have determined the minimal DNA-binding domain and obtained inductively coupled plasma atomic emission spectra and  1 H– 15 N,  1 H– 15 N– 13 C and  113 Cd 2+  NMR spectra, with or without its specific DNA molecule. Considering the results, it was concluded that the minimal DNA-binding domain includes two Zn 2+ -binding sites, one of which is adjacent to the interface for DNA binding. Systematic mutational analyses of the conserved cysteine residues in the minimal DNA-binding domain revealed that one Zn 2+ -binding site is indispensable for stabilization of the higher order structure of this DNA-binding domain, but that the other is not.

NMR and ICP spectroscopic analysis of the DNA-binding domain of the Drosophila GCM protein reveals a novel Zn 2+ -binding motif