A Change in the 310- to α-Helical Transition Point in the Heptapeptides Containing Sulfur and Selenium
Duley, Anju; Nethaji, Munirathinam; Ramanathan, Gurunath; Crystal Growth & Design 11 (2011) 2238–; doi:10.1021/cg101604g

data_4500504
_publ_section_title
;
 A Change in the 310- to \a-Helical Transition Point in the Heptapeptides
 Containing Sulfur and Selenium
;
_journal_issue                   6
_journal_name_full               'Crystal Growth &amp; Design'
_journal_page_first              2238
_journal_paper_doi               10.1021/cg101604g
_journal_volume                  11
_journal_year                    2011
_chemical_absolute_configuration rm
_chemical_formula_moiety         'C37 H69 N7 011 S'
_chemical_formula_sum            'C37 H69 N7 O11 S'
_chemical_formula_weight         820.05
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.253(4)
_cell_length_b                   21.321(10)
_cell_length_c                   23.611(12)
_cell_measurement_reflns_used    25981
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      26.0
_cell_measurement_theta_min      2.0
_cell_volume                     4658(4)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT+'
_computing_molecular_graphics    'Diamond 3'
_computing_publication_material  'WinGX publication routines (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'Bruker SHELXTL'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       '\p and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.1582
_diffrn_reflns_av_sigmaI/netI    0.1912
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -26
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       -29
_diffrn_reflns_number            25981
_diffrn_reflns_theta_full        26.00
_diffrn_reflns_theta_max         26.00
_diffrn_reflns_theta_min         1.97
_exptl_absorpt_coefficient_mu    0.128
_exptl_absorpt_correction_T_max  0.9835
_exptl_absorpt_correction_T_min  0.9698
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            white
_exptl_crystal_density_diffrn    1.169
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       rod
_exptl_crystal_F_000             1776
_exptl_crystal_size_max          0.24
_exptl_crystal_size_mid          0.17
_exptl_crystal_size_min          0.13
_refine_diff_density_max         0.471
_refine_diff_density_min         -0.301
_refine_diff_density_rms         0.064
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.19(17)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.942
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     536
_refine_ls_number_reflns         9081
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      0.942
_refine_ls_R_factor_all          0.1641
_refine_ls_R_factor_gt           0.0694
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0529P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1322
_refine_ls_wR_factor_ref         0.1752
_reflns_number_gt                4355
_reflns_number_total             9081
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            cg101604g_si_003.cif
_cod_data_source_block           peptideA
_cod_depositor_comments
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The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      P212121
_cod_database_code               4500504