The nuclear magnetic resonance (NMR) solution structure of an N-terminally truncated mutant Antennapedia homeodomain, des(1-6)Antp(C39S), has been determined from 935 nuclear Overhauser effect upper distance constraints and 148 dihedral angle constraints by using the programs DIANA and OPAL ...
The nuclear magnetic resonance (NMR) solution structure of an N-terminally truncated mutant Antennapedia homeodomain, des(1-6)Antp(C39S), has been determined from 935 nuclear Overhauser effect upper distance constraints and 148 dihedral angle constraints by using the programs DIANA and OPAL. Twenty conformers representing the solution structure of des(1-6)Antp(C39S) have an average root-mean-square distance relative to the mean coordinates of 0.56 A for the backbone atoms of residues 8-59. Comparison with the intact Antp(C39S) homeodomain shows that the two proteins have identical molecular architectures. The removal of the N-terminal residues 1-6, which are flexibly disordered in the intact homeodomain, causes only strictly localized structure variations and does not noticeably affect the adjoining helix I from residues 10-21. The DNA-binding constant of des(1-6)Antp(C39S) is approximately 10-fold reduced relative to the intact Antp(C39S) homeodomain, which can now be attributed to the absence of the previously reported contacts of the N-terminal polypeptide segment of the intact Antp(C39S) homeodomain with the minor groove of the DNA duplex.
Related Citations:
Structure Determination of the Antp(C39->S) Homeodomain from Nuclear Magnetic Resonance Data in Solution Using a Novel Strategy for the Structure Calculation with the Programs Diana, Caliba, Habas and Glomsa Guntert, P., Qian, Y.-Q., Otting, G., Muller, M., Gehring, W.J., Wuthrich, K. (1991) J Mol Biol 217: 531
The Structure of the Antennapedia Homeodomain Determined by NMR Spectroscopy in Solution: Comparison with Prokaryotic Repressors Qian, Y.-Q., Billeter, M., Otting, G., Muller, M., Gehring, W.J., Wuthrich, K. (1989) Cell 59: 573
Determination of the Three-Dimensional Structure of the Antennapedia Homeodomain from Drosophila in Solution by 1H Nuclear Magnetic Resonance Spectroscopy Billeter, M., Qian, Y.-Q., Otting, G., Muller, M., Gehring, W.J., Wuthrich, K. (1990) J Mol Biol 214: 183
Organizational Affiliation:
Institut für Molekularbiologie und Biophysik, Eidgenössiche Technische Hochschule-Hönggerberg, Zürich, Switzerland.
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