Engineering the Structure of an N-Terminal β-Turn To Maximize Screw-Sense Preference in Achiral Helical Peptide Chains.
De Poli, Matteo; Byrne, Liam; Brown, Robert A.; Solà, Jordi; Castellanos, Alejandro; Boddaert, Thomas; Wechsel, Romina; Beadle, Jonathan D.; Clayden, Jonathan; The Journal of organic chemistry 79 (2014) 4659–4675; doi:10.1021/jo500714b

data_4029365
_publ_contact_author
; 
    Madeleine Helliwell 
;
_publ_section_title
;
 Engineering the Structure of an N-Terminal \b-Turn To Maximize
 Screw-Sense Preference in Achiral Helical Peptide Chains.
;
_journal_issue                   10
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              4659
_journal_page_last               4675
_journal_paper_doi               10.1021/jo500714b
_journal_volume                  79
_journal_year                    2014
_chemical_formula_moiety         'C50 H57 N7 O8, 1.5(C D4 O)'
_chemical_formula_sum            'C51.5 H57 D6 N7 O9.5'
_chemical_formula_weight         938.09
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_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                 101.7430(11)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   21.4230(6)
_cell_length_b                   9.3120(3)
_cell_length_c                   25.4800(9)
_cell_measurement_reflns_used    7298
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      25.350
_cell_measurement_theta_min      0.998
_cell_volume                     4976.6(3)
_computing_cell_refinement       'HKL Scalepack (Otwinowski & Minor 1997)'
_computing_data_collection       KappaCCD
_computing_data_reduction        'Denzo and Scalepak (Otwinowski & Minor, 1997)'
_computing_molecular_graphics    'Ortep (Johnson, 1976)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 9
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.991
_diffrn_measurement_device       '95mm CCD camera on \k-goniostat'
_diffrn_measurement_device_type  KappaCCD
_diffrn_measurement_method       CCD
_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  0.1204
_diffrn_reflns_av_sigmaI/netI    0.1313
_diffrn_reflns_limit_h_max       25
_diffrn_reflns_limit_h_min       -25
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       30
_diffrn_reflns_limit_l_min       -30
_diffrn_reflns_number            15282
_diffrn_reflns_theta_full        25.03
_diffrn_reflns_theta_max         25.03
_diffrn_reflns_theta_min         2.27
_exptl_absorpt_coefficient_mu    0.087
_exptl_absorpt_correction_T_max  0.9914
_exptl_absorpt_correction_T_min  0.9539
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Blessing, R. H. (1995) Acta Cryst. A51, 33-38'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.252
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             1988
_exptl_crystal_size_max          0.55
_exptl_crystal_size_mid          0.3
_exptl_crystal_size_min          0.1
_refine_diff_density_max         0.336
_refine_diff_density_min         -0.359
_refine_diff_density_rms         0.077
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.050
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     669
_refine_ls_number_reflns         8704
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.050
_refine_ls_R_factor_all          0.1408
_refine_ls_R_factor_gt           0.0733
_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^)+(0.0794P)^2^+4.2527P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1741
_refine_ls_wR_factor_ref         0.2192
_reflns_number_gt                4976
_reflns_number_total             8704
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo500714b_si_003.cif
_cod_data_source_block           s3590
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to
/usr/data/users/saulius/crontab/automatic-downloads/rss-feeds/ACS/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 2281 2013-09-26 08:29:07Z andrius 

 Adding full bibliography for 4029365--4029371.cif.
;
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_original_formula_sum        'C51.50 H57 D6 N7 O9.50'
_cod_database_code               4029365