Crystallographic Characterization of Helical Secondary Structures in 2:1 and 1:2 α/β-Peptides
Soo Hyuk Choi; Ilia A. Guzei; Lara C. Spencer; Samuel H. Gellman; Journal of the American Chemical Society 131 (2009) 2917–2924; doi:10.1021/ja808168y

data_4103964
_publ_contact_author_address
;
   2124 Chemistry Department
   University of Wisconsin-Madison
   1101 University Ave
   Madison, WI  53706
   USA
;
_publ_contact_author_email       iguzei@chem.wisc.edu
_publ_contact_author_fax         608-262-0381
_publ_contact_author_name
;
Ilia A. Guzei
;
_publ_contact_author_phone       608-263-4694
_publ_section_title
;
 Crystallographic Characterization of Helical Secondary Structures in 2:1
 and 1:2 \a/\b-Peptides
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              2917
_journal_page_last               2924
_journal_paper_doi               10.1021/ja808168y
_journal_volume                  131
_journal_year                    2009
_chemical_formula_moiety         'C44.50 H68 N6 O9.50'
_chemical_formula_sum            'C44.5 H68 N6 O9.5'
_chemical_formula_weight         839.05
_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
;
manual editing of this CIF file 
created by SHELXTL Ver. 6.10 
;
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
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_cell_length_a                   17.5704(13)
_cell_length_b                   19.5584(14)
_cell_length_c                   26.6849(19)
_cell_measurement_reflns_used    999
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      26.42
_cell_measurement_theta_min      1.39
_cell_volume                     9170.2(11)
_computing_cell_refinement       'Bruker SAINT Ver. 6.22'
_computing_data_collection       'Bruker SMART Ver. 5.622'
_computing_data_reduction        'Bruker SAINT Ver. 6.22'
_computing_molecular_graphics    'Bruker SHELXTL Ver. 6.10'
_computing_publication_material  'Bruker SHELXTL Ver. 6.10'
_computing_structure_refinement  'Bruker SHELXTL Ver. 6.10'
_computing_structure_solution    'Bruker SHELXTL Ver. 6.10'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker CCD-1000 area detector'
_diffrn_measurement_method       '0.30 degree omega 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  0.0601
_diffrn_reflns_av_sigmaI/netI    0.0648
_diffrn_reflns_limit_h_max       21
_diffrn_reflns_limit_h_min       -22
_diffrn_reflns_limit_k_max       24
_diffrn_reflns_limit_k_min       -24
_diffrn_reflns_limit_l_max       32
_diffrn_reflns_limit_l_min       -33
_diffrn_reflns_number            65317
_diffrn_reflns_theta_full        26.42
_diffrn_reflns_theta_max         26.42
_diffrn_reflns_theta_min         1.39
_diffrn_standards_decay_%        <1
_diffrn_standards_interval_count n/a
_diffrn_standards_interval_time  n/a
_diffrn_standards_number         n/a
_exptl_absorpt_coefficient_mu    0.086
_exptl_absorpt_correction_T_max  0.9898
_exptl_absorpt_correction_T_min  0.9609
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
multi-scan with SADABS  (Bruker-AXS, 2003)
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.215
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    none
_exptl_crystal_description       block
_exptl_crystal_F_000             3624
_exptl_crystal_size_max          0.47
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.12
_refine_diff_density_max         1.006
_refine_diff_density_min         -0.434
_refine_diff_density_rms         0.051
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.8(7)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.034
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     1097
_refine_ls_number_reflns         18783
_refine_ls_number_restraints     6
_refine_ls_restrained_S_all      1.033
_refine_ls_R_factor_all          0.0865
_refine_ls_R_factor_gt           0.0541
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0673P)^2^+3.2833P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1262
_refine_ls_wR_factor_ref         0.1435
_reflns_number_gt                13851
_reflns_number_total             18783
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja808168y_si_007.cif
_cod_data_source_block           gellman32
_cod_depositor_comments
;
The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'not measured' was changed to '?'
- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 
;
_cod_original_formula_sum        'C44.50 H68 N6 O9.50'
_cod_database_code               4103964