Construction of cross-layer linked G-octamer via conformational control: stable G-quadruplex in H-bond competitive solvent
Shi, Xiaodong; He, Ying; Zhang, Yanbin; Wojtas, Lukasz; Ahkmedov, Novruz G.; Thai, David; Wang, Heng; Li, Xiaopeng; Guo, Hao; Chemical Science  (2019) –; doi:10.1039/C9SC00190E

data_1550707
_publ_section_title
;
 Construction of cross-layer linked G-octamer via conformational control:
 stable G-quadruplex in H-bond competitive solvent
;
_journal_name_full               'Chemical Science'
_journal_paper_doi               10.1039/C9SC00190E
_journal_year                    2019
_chemical_formula_sum            'C236.35 H284 N46.61 O54 Si8 Sr'
_chemical_formula_weight         4954.17
_space_group_crystal_system      monoclinic
_space_group_IT_number           4
_space_group_name_Hall           'P 2yb'
_space_group_name_H-M_alt        'P 1 21 1'
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 1'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2017/1
_audit_update_record
;
2018-10-04 deposited with the CCDC.    2019-03-05 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90.387(2)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   29.4434(14)
_cell_length_b                   30.9027(14)
_cell_length_c                   33.2881(15)
_cell_measurement_reflns_used    9847
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      53.4
_cell_measurement_theta_min      2.5
_cell_volume                     30288(2)
_computing_structure_refinement  'SHELXL-2017/1 (Sheldrick, 2017)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.987
_diffrn_measured_fraction_theta_max 0.987
_diffrn_measurement_device_type  'Bruker D8 Venture PHOTON II CPAD'
_diffrn_measurement_method       'omega scans'
_diffrn_radiation_monochromator  mirrors
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0646
_diffrn_reflns_av_unetI/netI     0.0578
_diffrn_reflns_Laue_measured_fraction_full 0.987
_diffrn_reflns_Laue_measured_fraction_max 0.987
_diffrn_reflns_limit_h_max       25
_diffrn_reflns_limit_h_min       -30
_diffrn_reflns_limit_k_max       32
_diffrn_reflns_limit_k_min       -32
_diffrn_reflns_limit_l_max       29
_diffrn_reflns_limit_l_min       -34
_diffrn_reflns_number            360882
_diffrn_reflns_point_group_measured_fraction_full 0.967
_diffrn_reflns_point_group_measured_fraction_max 0.967
_diffrn_reflns_theta_full        54.384
_diffrn_reflns_theta_max         54.384
_diffrn_reflns_theta_min         2.456
_diffrn_source                   'INCOATEC Imus micro-focus source'
_exptl_absorpt_coefficient_mu    1.138
_exptl_absorpt_correction_T_max  1
_exptl_absorpt_correction_T_min  0.7379
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS-2016/2
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.086
_exptl_crystal_description       block
_exptl_crystal_F_000             10441
_exptl_crystal_size_max          0.310
_exptl_crystal_size_mid          0.250
_exptl_crystal_size_min          0.170
_refine_diff_density_max         0.947
_refine_diff_density_min         -1.371
_refine_diff_density_rms         0.127
_refine_ls_abs_structure_details
;
 Flack x determined using 19274 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.138(4)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.437
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     6077
_refine_ls_number_reflns         71854
_refine_ls_number_restraints     16575
_refine_ls_restrained_S_all      1.354
_refine_ls_R_factor_all          0.1608
_refine_ls_R_factor_gt           0.1308
_refine_ls_shift/su_max          0.010
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.2000P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.3310
_refine_ls_wR_factor_ref         0.3598
_reflns_Friedel_coverage         0.916
_reflns_Friedel_fraction_full    0.946
_reflns_Friedel_fraction_max     0.946
_reflns_number_gt                51296
_reflns_number_total             71854
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c9sc00190e2.cif
_cod_data_source_block           HY-8PhGSrPic
_cod_database_code               1550707
_shelx_shelxl_version_number     2017/1
_shelx_estimated_absorpt_t_min   0.719
_shelx_estimated_absorpt_t_max   0.830
_shelx_res_checksum              52326