The N-terminal sequence of porphobilinogen-synthase (EC 4.2.1.24) from bovine liver up to position 44 is given. After tryptic hydrolysis two N-terminal peptides with identical amino acid composition were isolated in the ratio 1:1. One peptide was blocked whereas the other one started with methionine and showed the same primary structure which had been estimated by automatic degradation of the e...

The heme biosynthetic pathway of the malaria parasite is a drug target and the import of host -aminolevulinate dehydratase (ALAD), the second enzyme of the pathway, from the red cell cytoplasm by the intra erythrocytic malaria parasite has been demonstrated earlier in this laboratory. In this study, ALAD encoded by the Plasmodium falciparum genome (PfALAD) has been cloned, the protein overexpre...

Material and Methods: We performed cross-sectional study using 60 workers occupationally exposed to lead compared with 60 controls. All examinees were assessed by Questionnaire, and laboratory testing concerning blood lead level (BLL), activity of delta-aminolevulinic acid dehydratase (ALAD) in blood, concentration of delta-aminolevulinic acid (ALA) and coproporphyrin in urine, reticulocytes an...

It is well know that exposure to lead causes disorders of porphyrin metabolism such as elevation of ƒÂ-aminolevulinic acid (ALA) and coproporphyrin (CP) in urine, accumulation of protoporphyrin (PROTO) in erythrocytes, and inhibition of erythrocyte ƒÂ-aminolevulinic acid dehydratase (ALAD) activity.') In addition, it has been reported that inorganic tin (II) also inhibits erythrocyte ALAD activ...

The Gram-positive bacterium B. cereus produces both -lactamase I, a class A serine enzyme, and -lactamase II, a zinc dependent enzyme of class B. Crystallographic studies of these two enzymes have shown that -lactamase I is homologous with the penicillin-sensitive D-alaD-ala carboxypeptidase-transpeptidase of Streptomyces R61 while -lactamase II has a hitherto unknown structure. New methods of ...

The aim of this study was to analyze the effect heme synthesis inhibition on cytoglobin expression and its correlation with keloid fibroblast viability proliferation. conducted primary culture fibroblasts. Heme in fibroblasts inhibited using succinyl acetone. We measured ALAD enzyme activity a colorimetric method; mRNA qRT-PCR; protein ELISA immunocytochemistry; MTT test; proliferation BrdU tes...