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Protein-ligand interactions
Hodel, A. E. and Quiocho, F. A.  International Tables for Crystallography (2012). Vol. F, ch. 23.3, pp. 755-765 [ doi:10.1107/97809553602060000892 ]
... sulfate and phosphate interactions. 23.3.1. Introduction There are currently over a thousand unique protein-bound ligands described in the Protein Data ... assembly. The specific binding of small molecules to proteins is a primary means by which living systems interact and exchange information ... are often quite similar to the intramolecular interactions observed within a protein molecule. Examples of all the various non-covalent ...

Short hydrogen bonds
Hodel, A. E. and Quiocho, F. A.  International Tables for Crystallography (2012). Vol. F, Section 23.3.5.2, p. 763 [ doi:10.1107/97809553602060000892 ]
... has been assessed to be no better than that of a normal hydrogen bond (Wang et al., 1997). Thus, a unique role for short hydrogen bonds in biological systems, such ... bonds and enzymic catalysis. Science, 264, 1887-1890. Gerlt, J. A. & Gassman, P. G. (1993). Understanding the rates of ...
     [more results from section 23.3.5 in volume F]

The recognition of alkylated bases
Hodel, A. E. and Quiocho, F. A.  International Tables for Crystallography (2012). Vol. F, Section 23.3.4.7, p. 760 [ doi:10.1107/97809553602060000892 ]
... bases The complex of VP39 with capped RNA also illustrates a final example of the diversity of protein-ligand interactions in ... methylguanosine cap. When guanosine is methylated at the N7 position, a positive charge is introduced to the [pi]-ring system of the base. Eukaryotic cells utilize the methylation of a guanosine base at the N7 position as a tag ...
     [more results from section 23.3.4 in volume F]

Metals important in protein function and structure
Hodel, A. E. and Quiocho, F. A.  International Tables for Crystallography (2012). Vol. F, Section 23.3.3.1, pp. 756-757 [ doi:10.1107/97809553602060000892 ]
... and structure 23.3.3.1. Metals important in protein function and structure A number of metals are relatively abundant and available in living ... include sodium, potassium, magnesium and calcium. Along with these ions, a large variety of trace metals are also found coordinated to ... of the electron cloud of the ion. The nucleus of a hard metal has a relatively tight hold on the ...
     [more results from section 23.3.3 in volume F]

Carbohydrate recognition at the atomic level
Hodel, A. E. and Quiocho, F. A.  International Tables for Crystallography (2012). Vol. F, Section 23.3.2.1, pp. 755-756 [ doi:10.1107/97809553602060000892 ]
... to appear ubiquitously in the structures of protein-carbohydrate complexes (Quiocho, 1986). A generic cyclic sugar in mono- or oligosaccharides appears to be recognized as a disc that displays two flat non-polar surfaces surrounded ...
     [more results from section 23.3.2 in volume F]

Introduction
Hodel, A. E. and Quiocho, F. A.  International Tables for Crystallography (2012). Vol. F, Section 23.3.1, p. 755 [ doi:10.1107/97809553602060000892 ]
Introduction 23.3.1. Introduction There are currently over a thousand unique protein-bound ligands described in the Protein Data ... assembly. The specific binding of small molecules to proteins is a primary means by which living systems interact and exchange information ... are often quite similar to the intramolecular interactions observed within a protein molecule. Examples of all the various non-covalent ...

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