David Nicholson

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S-Adenosylmethionine (AdoMet) synthetase (SAMS: EC catalyses the formation of AdoMet from methionine and ATP. We have cloned a gene for Plasmodium falciparum AdoMet synthetase (PfSAMS) (GenBank accession no. AF097923), consisting of 1209 base pairs with no introns. The gene encodes a polypeptide (PfSAMS) of 402 amino acids with a molecular mass of(More)
During the effector phase of apoptosis, caspase activation appears to be responsible for the distinctive structural changes of apoptosis and perhaps for some of the changes in function of the doomed cells. There is therefore interest in identifying caspase substrates and the details of the cleavage events. Here we define precisely the event responsible for(More)
The analysis of faecal and urinary porphyrins by high pressure liquid chromatography (H.P.L.C.) provides characteristic profiles and facilitates rapid diagnosis of variegate (porphyria cutanea tarda hereditaria), symptomatic porphyria (porphyria cutanea tarda symptomatica), hereditary coproporphyria, acute intermittent porphyria, erythro-hepatic(More)
1. Tritiated oxymesoporphyrins and their ferrihaems were tested as possible intermediates in the catabolism of haemoglobin. The tritiated compounds were injected into rats with biliary fistulae and the incorporation of the isotope into bile, bile pigment, urine, faeces, liver, kidney and spleen was measured. 2. alpha-Oxymesoferrihaem was extensively(More)
In a family inheriting the hereditary coproporphyria (HCP) gene, where 414 descendants have been traced through six generations and 135 members screened for faecal porphyrins, 27 subjects were found to have inherited the gene as well as the proband. Seven (six female and one male) in retrospect had probably previously suffered from a clinical attack of(More)
The incorporation of [15N] glycine into early labelled bilirubin and haemoglobin haem was measured in four haematologically normal subjects, using the clearance of [14C] bilirubin to measure total bilirubin production rate. Hepatic haem turnover was calculated from the incorporation of [15N]=sigma-aminolaevulinic acid into early labelled bilirubin. From the(More)