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• W2045591779 abstract "This report investigates the sequence specificity requirements for homeodomain structure and DNA binding activity by the design and synthesis of a minimAl homeodomain (for minimalist design and alanine scanning mutagenesis) which contains the consensus residues and in which all nonconsensus residues have been replaced with alanine. The murine homeodomain Msx served as the prototype for the minimAl homeodomain, Ala-Msx. We show that Ala-Msx binds to DNA specifically, albeit with lower affinity than Msx. A derivative of the minimAl homeodomain, Ala-Msx(NT), which contains a native rather than an alanine-substituted N-terminal arm, has similar DNA binding affinity as Msx. We show that the native N-terminal arm stabilizes the tertiary structure of the minimAl homeodomain. Although Ala-Msx resembles a molten-globule protein, the structure of Ala-Msx(NT) is similar to Msx. The requirement for an intact N-terminal arm is not unique to the minimAl homeodomain, since the N-terminal arm also promotes high-affinity binding activity and appropriate tertiary structure of Msx. Therefore, the homeodomain scaffold consists of consensus residues, which are sufficient for DNA recognition, and nonconsensus residues in the N-terminal arm, which are required for optimal DNA binding affinity and appropriate tertiary structure. MinimAl design provides a powerful strategy to probe homeodomain structure and function. This approach should be of general utility to study the sequence specificity requirements for structure and function of other DNA-binding domains." @default.
• W2045591779 created "2016-06-24" @default.
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• W2045591779 date "1994-08-30" @default.
• W2045591779 modified "2023-10-18" @default.
• W2045591779 title "Design of a minimAl homeodomain: the N-terminal arm modulates DNA binding affinity and stabilizes homeodomain structure." @default.
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• W2045591779 doi "https://doi.org/10.1073/pnas.91.18.8373" @default.
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