Fig. 4.

Structural similarity pattern in the homodimer protein biotin carboxylase (PDB: 1bnc) and in the TATA-binding protein (TBP) (PDB: 1ytf). The proteins are represented as pink cartoon models, TATA box DNA as cyan cartoon model; the structurally similar residues are shown as yellow, orange and red stick models and the interacting residues on the opposing chains are shown as pink stick models. Hydrogen bond pattern occurring (A) between biotin carboxylase and bound ligands, biotin, ADP, Mg²⁺ and bicarbonate ion; (B) between the two subunits of biotin carboxylase; (C) between the TBP and the transcription factor IIA and (D) between the TBP and the TATA box DNA is shown.