Primary Citation of Related Structures: 1IDY, 1IDZ
PubMed Abstract:
A small globular protein, the third repeat of the c-Myb DNA-binding domain, which is composed of 54 amino acid residues, was engineered so as to understand the structural uniqueness of native proteins. This small protein has three alpha-helices that form a helix-turn-helix structure, which is maintained by the hydrophobic core with three Ile residues ...
A small globular protein, the third repeat of the c-Myb DNA-binding domain, which is composed of 54 amino acid residues, was engineered so as to understand the structural uniqueness of native proteins. This small protein has three alpha-helices that form a helix-turn-helix structure, which is maintained by the hydrophobic core with three Ile residues. One of the mutant proteins, with two of the buried Ile (Ile-155 and Ile-181) substituted with Leu residues, showed multiple conformations, as monitored by heteronuclear magnetic resonance spectroscopy for 13C- and 15N-labeled proteins. The increase in the side-chain conformational entropy, caused by changing the Ile to a Leu residue on an alpha-helix, could engender the lack of structural uniqueness. In native proteins, the conformations of not only the beta-branched side chains, but also those of the neighboring bulky side chains, can be greatly restricted, depending upon the local backbone structure.
Related Citations:
Comparison of the Free and DNA-Complexed Forms of the DNA-Binding Domain from C-Myb Ogata, K., Morikawa, S., Nakamura, H., Hojo, H., Yoshimura, S., Zhang, R., Aimoto, S., Ametani, Y., Hirata, Z., Sarai, A., al., et (1995) Nat Struct Biol 2: 309
Solution Structure of a Specific DNA Complex of the Myb DNA-Binding Domain with Cooperative Recognition Helices Ogata, K., Morikawa, S., Nakamura, H., Sekikawa, A., Inoue, T., Kanai, H., Sarai, A., Ishii, S., Nishimura, Y. (1994) Cell 79: 639
Solution Structure of a DNA-Binding Unit of Myb: A Helix-Turn-Helix-Related Motif with Conserved Tryptophans Forming a Hydrophobic Core Ogata, K., Hojo, H., Aimoto, S., Nakai, T., Nakamura, H., Sarai, A., Ishii, S., Nishimura, Y. (1992) Proc Natl Acad Sci U S A 89: 6428
Organizational Affiliation:
Biomolecular Engineering Research Institute, Osaka, Japan.
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