Diversity of Secondary Structure in Catalytic Peptides with β-Turn-Biased Sequences.
Metrano, Anthony J.; Abascal, Nadia C.; Mercado, Brandon Q.; Paulson, Eric K.; Hurtley, Anna E.; Miller, Scott J.; Journal of the American Chemical Society 139 (2017) 492–516; doi:10.1021/jacs.6b11348

data_4125339
_publ_section_title
;
 Diversity of Secondary Structure in Catalytic Peptides with
 \b-Turn-Biased Sequences.
;
_journal_issue                   1
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              492
_journal_page_last               516
_journal_paper_doi               10.1021/jacs.6b11348
_journal_volume                  139
_journal_year                    2017
_chemical_absolute_configuration syn
_chemical_formula_moiety         'C28 H50 N6 O6'
_chemical_formula_sum            'C28 H50 N6 O6'
_chemical_formula_weight         566.74
_space_group_crystal_system      orthorhombic
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   mixed
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   12.4001(19)
_cell_length_b                   15.333(2)
_cell_length_c                   16.440(2)
_cell_measurement_reflns_used    3278
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      27.08
_cell_measurement_theta_min      2.24
_cell_volume                     3125.7(7)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics
; 
Dolomanov, O.V.; Bourhis, L.J.; Gildea, R.J.; Howard, J.A.K.; Puschmann, H., 
OLEX2: A complete structure solution, refinement and analysis program
(2009). J. Appl. Cryst., 42, 339-341.  
;
_computing_publication_material  'CIFTAB-2013/2 (Sheldrick, 2013)'
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_solution    'SHELXT-2014/5 (Sheldrick, 2014)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 10.42
_diffrn_measured_fraction_theta_full 0.988
_diffrn_measured_fraction_theta_max 0.988
_diffrn_measurement_device_type  'Bruker D8 with PHOTON 100 detector'
_diffrn_measurement_method       '\w/\q shutterless scans'
_diffrn_radiation_type           Synchrotron
_diffrn_radiation_wavelength     0.7749
_diffrn_reflns_av_R_equivalents  0.0363
_diffrn_reflns_av_unetI/netI     0.0677
_diffrn_reflns_Laue_measured_fraction_full 0.988
_diffrn_reflns_Laue_measured_fraction_max 0.988
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            8929
_diffrn_reflns_point_group_measured_fraction_full 0.980
_diffrn_reflns_point_group_measured_fraction_max 0.980
_diffrn_reflns_theta_full        27.441
_diffrn_reflns_theta_max         27.441
_diffrn_reflns_theta_min         2.243
_diffrn_source                   'Advanced Light Source station 11.3.1'
_exptl_absorpt_coefficient_mu    0.104
_exptl_absorpt_correction_T_max  0.7455
_exptl_absorpt_correction_T_min  0.6500
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS-2014/5 (Bruker AXS)'
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.204
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Plate
_exptl_crystal_F_000             1232
_exptl_crystal_size_max          0.040
_exptl_crystal_size_mid          0.040
_exptl_crystal_size_min          0.010
_refine_diff_density_max         0.354
_refine_diff_density_min         -0.221
_refine_diff_density_rms         0.048
_refine_ls_abs_structure_details
; 
 Flack x determined using 1595 quotients [(I+)-(I-)]/[(I+)+(I-)] 
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259). 
;
_refine_ls_abs_structure_Flack   -0.9(8)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.065
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     382
_refine_ls_number_reflns         5418
_refine_ls_number_restraints     3
_refine_ls_restrained_S_all      1.066
_refine_ls_R_factor_all          0.0659
_refine_ls_R_factor_gt           0.0507
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0494P)^2^+0.6310P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1139
_refine_ls_wR_factor_ref         0.1212
_reflns_Friedel_coverage         0.762
_reflns_Friedel_fraction_full    0.969
_reflns_Friedel_fraction_max     0.969
_reflns_number_gt                4410
_reflns_number_total             5418
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja6b11348_si_015.cif
_cod_data_source_block           als-16026
_cod_depositor_comments
'Adding full bibliography for 4125336--4125366.cif.'
_cod_original_cell_volume        3125.7(8)
_cod_database_code               4125339
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.996
_shelx_estimated_absorpt_t_max   0.999
_shelx_res_checksum              78385
_shelx_hkl_checksum              14950