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Izumi Y, Watanabe H, Watanabe N, Aoyama A, Jinbo Y, Hayashi N. Solution X-ray Scattering Reveals a Novel Structure of Calmodulin Complexed with a Binding Domain Peptide from the HIV-1 Matrix Protein p17. Biochemistry 2008; 47:7158-66. [DOI: 10.1021/bi702416b] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Yoshinobu Izumi
- Graduate Program of Human Sensing and Functional Sensor Engineering, Yamagata University, 4-3-16, Jo-nan, Yonezawa, Yamagata 992-8510, Japan, and Institute for Comprehensive Medical Science, Fujita Health University, Toyoake, Aichi 470-1192, Japan
| | - Hiroki Watanabe
- Graduate Program of Human Sensing and Functional Sensor Engineering, Yamagata University, 4-3-16, Jo-nan, Yonezawa, Yamagata 992-8510, Japan, and Institute for Comprehensive Medical Science, Fujita Health University, Toyoake, Aichi 470-1192, Japan
| | - Noriko Watanabe
- Graduate Program of Human Sensing and Functional Sensor Engineering, Yamagata University, 4-3-16, Jo-nan, Yonezawa, Yamagata 992-8510, Japan, and Institute for Comprehensive Medical Science, Fujita Health University, Toyoake, Aichi 470-1192, Japan
| | - Aki Aoyama
- Graduate Program of Human Sensing and Functional Sensor Engineering, Yamagata University, 4-3-16, Jo-nan, Yonezawa, Yamagata 992-8510, Japan, and Institute for Comprehensive Medical Science, Fujita Health University, Toyoake, Aichi 470-1192, Japan
| | - Yuji Jinbo
- Graduate Program of Human Sensing and Functional Sensor Engineering, Yamagata University, 4-3-16, Jo-nan, Yonezawa, Yamagata 992-8510, Japan, and Institute for Comprehensive Medical Science, Fujita Health University, Toyoake, Aichi 470-1192, Japan
| | - Nobuhiro Hayashi
- Graduate Program of Human Sensing and Functional Sensor Engineering, Yamagata University, 4-3-16, Jo-nan, Yonezawa, Yamagata 992-8510, Japan, and Institute for Comprehensive Medical Science, Fujita Health University, Toyoake, Aichi 470-1192, Japan
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Akiyama S, Fujisawa T, Ishimori K, Morishima I, Aono S. Activation mechanisms of transcriptional regulator CooA revealed by small-angle X-ray scattering. J Mol Biol 2004; 341:651-68. [PMID: 15288777 DOI: 10.1016/j.jmb.2004.06.040] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2004] [Revised: 06/03/2004] [Accepted: 06/07/2004] [Indexed: 10/26/2022]
Abstract
CooA, a heme-containing transcriptional activator, binds CO to the heme moiety and then undergoes a structural change that promotes the specific binding to the target DNA. To elucidate the activation mechanism coupled to CO binding, we investigated the CO-dependent structural transition of CooA with small-angle X-ray scattering (SAXS). In the absence of CO, the radius of gyration Rg and the second virial coefficient (A2) were 25.3(+/-0.5)A and -0.39(+/-0.25) x 10(-4)ml mol g(-2), respectively. CO binding caused a slight increase in Rg (by 0.5A) and a marked decrease in A2 (by 5.09 x 10(-4)ml mol g(-2)). The observed decrease in A2 points to higher attractive interactions between CO-bound CooA molecules in solution compared with CO-free CooA. Although the minor alternation of Rg rules out changes in the overall structure, the marked change in the surface properties points to a CO-induced conformational transition. The experimental Rg and SAXS curves of the two states did not agree with the crystal structure of CO-free CooA. We thus simulated the solution structures of CooA based on the experimental data using rigid-body refinements as well as low-resolution model reconstructions. Both results demonstrate that the hinge region connecting the N-terminal heme domain and C-terminal DNA-binding domain is kinked in CO-free CooA, so that the two domains are positioned close to each other. The CO-dependent structural change observed by SAXS corresponds to a slight swing of the DNA-binding domains away from the heme domains coupled with their rotation by about 8 degrees around the axis of 2-fold symmetry.
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Affiliation(s)
- Shuji Akiyama
- RIKEN Harima Institute/SPring-8, Structural Biochemistry Laboratory, 1-1-1 Kouto, Mikazuki, Sayo, Hyogo 679-5148, Japan
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Current awareness on yeast. Yeast 2003. [DOI: 10.1002/yea.947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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