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NMR processing:
MDD
NMR assignment:
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PINE
Side-chains:
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UNIO Candid
ASDP
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Ab initio:
GeNMR
Cyana
XPLOR-NIH
ASDP
UNIO ATNOS-Candid
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Fragment-based:
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Template-based:
GeNMR
I-TASSER
Refinement:
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Structure from chemical shifts:
Fragment-based:
WeNMR CS-Rosetta
BMRB CS-Rosetta
Homology-based:
CS23D
Simshift
Torsion angles from chemical shifts:
Preditor
TALOS
Promega- Proline
Secondary structure from chemical shifts:
CSI (via RCI server)
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MICS caps, β-turns
d2D
PECAN
Flexibility from chemical shifts:
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Interactions from chemical shifts:
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Chemical shifts re-referencing:
Shiftcor
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RDCs:
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V-NMR
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Methyl S2
B-factor
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From structure:
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CH3shift- Methyl
ArShift- Aromatic
ShiftS
Proshift
PPM
CheShift-2- Cα
From sequence:
Shifty
Camcoil
Poulsen_rc_CS
Disordered proteins:
MAXOCC
Format conversion & validation:
CCPN
From NMR-STAR 3.1
Validate NMR-STAR 3.1
NMR sample preparation:
Protein disorder:
DisMeta
Protein solubility:
camLILA
ccSOL
Camfold
camGroEL
Zyggregator
Isotope labeling:
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Solid-state NMR:
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Default Binding, X-ray and NMR studies of the three A-ring isomers of natural estradiol.

Binding, X-ray and NMR studies of the three A-ring isomers of natural estradiol.

Related Articles Binding, X-ray and NMR studies of the three A-ring isomers of natural estradiol.

J Steroid Biochem. 1990 Feb;35(2):219-29

Authors: Palomino E, Heeg MJ, Horwitz JP, Brooks SC

The effect of the position of the phenolic hydroxyl on the conformations of the three A-ring isomers of estradiol, namely, estra-1,3,5(10)-trien-1,17 beta-diol (10), estra-1,3,5(10)-trien-2,17 beta-diol (3), and estra-1,3,5(10)-trien-4,17 beta-diol (6), has been analyzed by X-ray crystallography. The results of these analyses were correlated with the absorptions of the angular methyl groups in the [1H]NMR spectra of these isomers and natural estradiol (E2). It was observed that the changes in chemical shift of protons at C18 corresponded to skeletal modifications in the steroid structure which changed the anisotropic effect of the hydroxyl group at C17. Examination of the affinity of these A-ring isomers of E2 for the estrogen receptor has shown the 2-hydroxylated isomer 3 to retain 1/5th the affinity of E2 for its binding protein. The 1- and 4-hydroxylated derivatives (10 and 6, respectively) bound to a much lesser extent. The receptor affinities of these estrogen analogues may be related to the angle between the 18-methyl and the 17 beta-hydroxyl groups (or the dihedral angle between the planar A-ring and the angular C18 methyl) as well as the position of the A-ring hydroxyl group.

PMID: 2308337 [PubMed - indexed for MEDLINE]



Source: PubMed
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