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Despite the importance of plant lignans and isoflavonoids in human health protection (e.g. for both treatment and prevention of onset of various cancers) as well as in plant biology (e.g. in defense functions and in heartwood development), systematic studies on the enzymes involved in their biosynthesis have only recently begun. In this investigation, three(More)
PEB3 is a glycoprotein adhesin from Campylobacter jejuni whose structure suggested a role in transport. We have investigated potential ligands for PEB3 and characterized their binding properties using biophysical methods in solution and by X-ray crystallography. A thermal aggregation assay of PEB3 with a library of physiological compounds identified three(More)
The crystal structure of d(ACCCT), solved by molecular replacement, shows a four-stranded i-motif conformation, where two parallel duplexes intercalate with one another in opposite orientations. Each duplex is stabilized by hemi-protonated C-C+ base pairing between parallel strands, and a string of water molecules bridge the cytosine N4 atoms to phosphate O(More)
Apoptosis is a highly regulated multistep process for programmed cellular destruction. It is centered on the activation of a group of intracellular cysteine proteases known as caspases. The baculoviral p35 protein effectively blocks apoptosis through its broad spectrum caspase inhibition. It harbors a caspase recognition sequence within a highly protruding(More)
Rubredoxins (Rds) may be separated into two classes based upon the correlation of their reduction potentials with the identity of residue 44; those with Ala44 have reduction potentials that are approximately 50 mV higher than those with Val44. The smaller side chain volume occupied by Ala44 relative to that occupied by Val44 has been proposed to explain the(More)
Biological electron transfer is an efficient process even though the distances between the redox moieties are often quite large. It is therefore of great interest to gain an understanding of the physical basis of the rates and driving forces of these reactions. The structural relaxation of the protein that occurs upon change in redox state gives rise to the(More)
Wide-spectrum caspase inhibition by the baculoviral p35 protein was previously shown to be a consequence of covalent inhibition in which a thioester bond is stably formed between the cleavage residue Asp87 of p35 and the active site Cys360' of caspase-8. Here we show that the N-terminal fragment of cleaved p35 (p35-N) is a circular peptide when dissociated(More)
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