Sheila G. Couto, M. Cristina Nonato, Antonio J. Costa-Filho 

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Defects in Vesicle Core Induced by Escherichia coli Dihydroorotate Dehydrogenase  Sheila G. Couto, M. Cristina Nonato, Antonio J. Costa-Filho  Biophysical Journal  Volume 94, Issue 5, Pages 1746-1753 (March 2008) DOI: 10.1529/biophysj.107.120055 Copyright © 2008 The Biophysical Society Terms and Conditions

Figure 1 ESR spectra of spin labels (a) DPPTC, (b) 5-, (c) 10-, (d) 12-, and (e) 16-PC incorporated into vesicles of DOPC/Triton X-100 in the absence (solid line) and in the presence of EcDHODH (dashed line). Experimental conditions: microwave frequency 9.5GHz; modulation amplitude 1.0G; modulation frequency 100kHz; microwave power 10 mW. Biophysical Journal 2008 94, 1746-1753DOI: (10.1529/biophysj.107.120055) Copyright © 2008 The Biophysical Society Terms and Conditions

Figure 2 Chemical structures of the (a) acyl-chain (16-PC) and (b) headgroup (DPPTC) spin labels showing the principal magnetic axes (xm, ym, zm). Biophysical Journal 2008 94, 1746-1753DOI: (10.1529/biophysj.107.120055) Copyright © 2008 The Biophysical Society Terms and Conditions

Figure 3 Experimental (dashed line) and simulated (solid line) ESR spectra from (a) DPPTC, (b) 12-, and (c) 16-PC labels in mixtures of DOPC/Triton X-100 (left column) and DOPC/Triton X-100/EcDHODH (right column). Biophysical Journal 2008 94, 1746-1753DOI: (10.1529/biophysj.107.120055) Copyright © 2008 The Biophysical Society Terms and Conditions

Figure 4 Experimental (dashed line) and calculated (solid line) ESR spectra from 5-PC spin probe in mixtures of (a) DOPC/Triton X-100 and (b) DOPC/Triton X-100/EcDHODH. b shows the individual components: 1 (bulk lipid, dotted line) and 2 (boundary lipid, dash-dotted line) obtained by means of NLSL simulations. Biophysical Journal 2008 94, 1746-1753DOI: (10.1529/biophysj.107.120055) Copyright © 2008 The Biophysical Society Terms and Conditions

Figure 5 Experimental (dashed line) and calculated (solid line) ESR spectra from 10-PC spin probe in mixtures of (a) DOPC/Triton X-100 and (b) DOPC/Triton X-100/EcDHODH. b shows the individual components: 1 (bulk lipid, dotted line) and 2 (boundary lipid, dash-dotted line) obtained as described in the text. Biophysical Journal 2008 94, 1746-1753DOI: (10.1529/biophysj.107.120055) Copyright © 2008 The Biophysical Society Terms and Conditions

Figure 6 Ribbon representation of EcDHODH structure emphasizing the hydrophobicity pattern for N-terminal domain (comprising residues in the two α-helices and one 310 helix) as determined by ProtScale software. The dehydrogenase-active domain is shown in cyan. Hydrophobic and hydrophilic residues in the N-terminal domain are colored in dark and light gray, respectively. Biophysical Journal 2008 94, 1746-1753DOI: (10.1529/biophysj.107.120055) Copyright © 2008 The Biophysical Society Terms and Conditions