Precision neutron diffraction structure determination of protein and nucleic acid components. VIII: the crystal and molecular structure of the β-form of the amino acidl-glutamic acid

@article{Lehmann1972PrecisionND,
  title={Precision neutron diffraction structure determination of protein and nucleic acid components. VIII: the crystal and molecular structure of the $\beta$-form of the amino acidl-glutamic acid},
  author={Mogens Steen Lehmann and Thomas F. Koetzle and Walter Clark Hamilton},
  journal={Journal of Crystal and Molecular Structure},
  year={1972},
  volume={2},
  pages={225-233}
}
A neutron diffraction study of the β-form of L-glutamic acid, C5H9NO4, has been carried out. The structure is orthorhombic: space groupP212121,a= 5·159(5),b= 17·30(2),c= 6·948(7) Å andz = 4. Least-squares refinements based on 803 reflexions led to a final conventionalR value of 0·026, and bond lengths involving hydrogen atoms have been determined with an average precision of 0·004 Å. The molecule is in the zwitterion form, and no intramolecular hydrogen bonds have been found. The hydrogen atom… 
Precision neutron diffraction structure determination of protein and nucleic acid components. XVII. Molecular and crystal structure of the amino acid glycine hydrochloride
The amino acid salt glycine hydrochloride, H3N+⋅CH2⋅COOH⋅Cl−, crystallizes in the space group P21/c, a=7.117(2) A, b=5.234(2) A, c=13.745(3) A, β=97.25(1) °. The crystal structure has been refined
Structure of α Form of L-Glutamic Acid. α-β Transition
An X-ray analysis of the α form of L-glutamic acid, C5H9NO4, has been carried out. The space group is P212121 with a=7.068(1), b=10.277(1), c=8.755(1) A and Z=4. The structure was solved by the
X-Ray Crystal Structures of Amino Acids and Selected Derivatives
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TLDR
Sensitive criteria such as the Laplacian of the electron density and energy densities in the bond-critical points reveal the incipient covalent character of the shortest O-H···O bond.
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  • Chemistry, Biology
    International journal of peptide and protein research
  • 1979
TLDR
The observed differences between the lengths of hydrogen bonds formed by different donor and acceptor groups in amino acids and peptides, imply differences in the energetics of their formation.
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After the discovery of X-ray diffraction by crystals, amino acids were among the first organic compounds to have their solid-state structures investigated. The Cambridge Structural Database now
Unusual zwitterion of D,L-beta-carboxyaspartic acid: pKa and X-ray crystallographic measurements.
TLDR
An investigation of the acidic properties and molecular structure of the new natural amino acid beta-carboxyaspartic acid (Asa) is described and analysis of the pKa data indicates that the predominate zwitterion in solution results from ionization of a beta- carboxyl group.
Analysis of O-H...O hydrogen bonds.
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Some geometrical parameters associated with the donor and the acceptor end of O-H…O hydrogen bonds have been analysed and the main results are arrived at.
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