Analysis of designed β-hairpin peptides: molecular conformation and packing in crystals.
Aravinda, Subrayashastry; Raghavender, Upadhyayula S.; Rai, Rajkishor; Harini, Veldore V.; Shamala, Narayanaswamy; Balaram, Padmanabhan; Organic & biomolecular chemistry 11 (2013) 4220–4231; doi:10.1039/c3ob25777k

data_7152979
_publ_section_title
;
 Analysis of designed \b-hairpin peptides: molecular conformation and
 packing in crystals.
;
_journal_issue                   25
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              4220
_journal_page_last               4231
_journal_paper_doi               10.1039/c3ob25777k
_journal_volume                  11
_journal_year                    2013
_chemical_formula_sum            'C54 H78 N8 O12'
_chemical_formula_weight         1031.24
_chemical_name_common            Boc-Leu-Phe-Val-D-Pro-Ala-Leu-Phe-Val-OMe
_chemical_name_systematic
;
t-Butyloxycarbonyl-leucyl-phenylalanyl-valyl-D-prolyl
-alanyl-leucyl-phenylalanyl-valyl-methyl ester
;
_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            8
_cell_length_a                   18.7511(9)
_cell_length_b                   23.3396(11)
_cell_length_c                   28.1926(13)
_cell_measurement_temperature    293(2)
_cell_volume                     12338.3(10)
_computing_data_collection       SMART
_computing_data_reduction        SAINT
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXD-97 (Schneider and Sheldrick, 2002)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.954
_diffrn_measured_fraction_theta_max 0.954
_diffrn_measurement_device_type
;
BRUKER AXS SMART APEXII ULTRA CCD with Cu source
;
_diffrn_measurement_method       'omega and phi scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'rotating anode'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.1273
_diffrn_reflns_av_sigmaI/netI    0.1012
_diffrn_reflns_limit_h_max       19
_diffrn_reflns_limit_h_min       -21
_diffrn_reflns_limit_k_max       28
_diffrn_reflns_limit_k_min       -27
_diffrn_reflns_limit_l_max       33
_diffrn_reflns_limit_l_min       -34
_diffrn_reflns_number            73135
_diffrn_reflns_theta_full        72.27
_diffrn_reflns_theta_max         72.27
_diffrn_reflns_theta_min         2.46
_exptl_absorpt_coefficient_mu    0.644
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.110
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needles
_exptl_crystal_F_000             4432
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.02
_exptl_crystal_size_min          0.01
_refine_diff_density_max         0.363
_refine_diff_density_min         -0.326
_refine_diff_density_rms         0.094
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -10(10)
_refine_ls_extinction_coef       0.0072(5)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.041
_refine_ls_hydrogen_treatment    'riding over the heavy atom'
_refine_ls_matrix_type           full
_refine_ls_number_parameters     1334
_refine_ls_number_reflns         12534
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.041
_refine_ls_R_factor_all          0.2319
_refine_ls_R_factor_gt           0.1208
_refine_ls_shift/su_max          2.796
_refine_ls_shift/su_mean         0.135
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1929P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2897
_refine_ls_wR_factor_ref         0.4029
_reflns_number_gt                3798
_reflns_number_total             12534
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c3ob25777k.txt
_cod_data_source_block           BH1P8
_cod_depositor_comments
;
The following automatic conversions were performed:
'_atom_site_symetry_multiplicity' tag replaced with
'_atom_site_symmetry_multiplicity'.

Automatic conversion script
Id: cif_correct_tags 1440 2010-10-19 06:21:57Z saulius 

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 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1891 2012-01-12 08:04:46Z andrius 
;
_cod_original_sg_symbol_H-M      P2(1)2(1)2(1)
_cod_database_code               7152979