Heidy Driessen

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The beta, gamma-crystallins form a class of homologous proteins in the eye lens. Each gamma-crystallin comprises four topologically equivalent, Greek key motifs; pairs of motifs are organized around a local dyad to give domains and two similar domains are in turn related by a further local dyad. Sequence comparisons and model building predicted that(More)
Bacteriophage T4 beta-glucosyltransferase (EC catalyses the transfer of glucose from uridine diphosphoglucose to hydroxymethyl groups of modified cytosine bases in T4 duplex DNA forming beta-glycosidic linkages. The enzyme forms part of a phage DNA protection system. We have solved and refined the crystal structure of recombinant(More)
A key success factor for a successful company in a dynamic environment is effective and efficient information technology (IT) supporting business strategies and processes. Organizations that successfully align their business strategy and their IT strategy outperform their non-aligned peers (Chan et al., 1997). In recent surveys IT executives consistently(More)
The crystal structure of turkey delta-crystallin, a principal soluble components of the avian lens, has been determined to a resolution of 2.5 A. It is a tetramer, of 200,000 M(r), with 222 symmetry. The subunit has a new fold composed of three mainly alpha-helical domains. One domain is a bundle of five long helices which forms a 20-helix bundle at the(More)
We use protein engineering and crystallography to simulate aspects of the early evolution of beta gamma-crystallins by observing how a single domain oligomerizes in response to changes in a sequence extension. The crystal structure of the C-terminal domain of gamma beta-crystallin with its four-residue C-terminal extension shows that the domain does not(More)
The crystal structure of the FMN-binding domain of human NADPH-cytochrome P450 reductase (P450R-FMN), a key component in the cytochrome P450 monooxygenase system, has been determined to 1.93 A resolution and shown to be very similar both to the global fold in solution (Barsukov I et al., 1997, J Biomol NMR 10:63-75) and to the corresponding domain in the(More)
beta-Crystallins are oligomeric eye lens proteins that are related to monomeric gamma-crystallins. The main sequence difference between the two families is the presence of sequence extensions in the beta-crystallins. A major question concerns the role that these extensions play in mediating interactions at the high protein concentrations found in the lens.(More)
The glutathione S-transferases play a pivotal role in the detoxification of toxic and carcinogenic electrophiles. We have previously reported the isolation of two actively transcribed murine pi-class glutathione S-transferase genes. In this study the two proteins encoded by these genes, Gst p-1 and Gst p-2, were expressed in Escherichia coli and found to(More)
gamma-Crystallins are a family of low molecular weight proteins found in high concentration in the densely packed regions of high refractive index in vertebrate lenses. Certain members have the characteristic property of a high critical temperature (tc) for phase separation. We report the three-dimensional structure determination of such a protein, bovine(More)
The nucleotide sequence of the cDNA of bovine lens beta s-crystallin has been determined, and the derived amino acid sequence has been confirmed by amino acid compositions and partial sequences of the tryptic peptides of this monomeric protein. beta s-Crystallin has a length of 177 residues, corresponding to a mol. wt. of 20 773, and a blocked N-terminal(More)