The 5,10-methenyltetrahydromethanopterin cyclohydrolase of Methanobacterium thermoautotrophicum was purified 128-fold to homogeneity. The enzyme had a subunit Mr of 41,000 as indicated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. From high-performance size exclusion chromatography of the native protein, an Mr of 82,000 was determined, suggesting a dimer of identical subunits. T...

A simple method with improved sensitivity for the temperature dependent, and enzyme activity can be lost detection of diVerent groups of proteinases in complex mixtures separated by polyacrylamide electrophoresis and overlaid with a nitrocellulose membrane impregnated with speciWc p-nitroanilide (pNA)1 substrates is described. A drawback of the direct testing of proteinase activity in a polyacr...

The lipid peroxidation product 4-hydroxynonenal (HNE) can form protein-linked HNE adducts, thereby impacting protein structure and function. Mitochondrial complex I (NADH-ubiquinone oxidoreductase), containing at least 45 subunits in mammalian cells, sits in a lipid-rich environment and is thus very susceptible to HNE modifications. In this paper, a procedure for the identification of HNE-modif...

M band protein can be specifically extracted from fresh chicken breast muscle myofibrils suspended in 5 mM Tris-HCl pH 8.0. During discontinuous polyacrylamide gel electrophoresis the isolated protein separates into three bands which can be identified as two separate components (A, B) and a complex of the two. When partially purified fractions of the separated components are combined, an increa...

The study aimed at identifying and purifying cytosolic glutathione transferase isoforms expressed in Pseudomonas sp. UW4. Search UniProt (https://www.uniprot.org/uniprot/), has indicated that there were 20 genes encoding putative transferases for the microorganism. molecular weights of ranged from 17.6 to 34.06 kDa. SDS-polyacrylamide gel electrophoresis revealed GST purified using Sulfobromoph...

RNA from bound polysomers of lactating ewe's mammary gland directs the synthesis of the three major milk proteins (alphas, beta and kappa-caseins) in a cell-free system derived from rabbit reticuyocytes. The "in vitro" product was identified by immunoprecipitation with specific antibodies and by electrophoresis in SDS polyacrylamide gel. Each of these messengers was purified from 20 to 25 fold ...

Cytosolic pyruvate kinase from endosperm of germinating castor beans (Ricinus communis L.; cv Hale) has been purified 3100-fold to apparent homogeneity and a final specific activity of 203 micromole pyruvate produced/minute per milligram protein. Purification steps included: heat treatment, polyethylene glycol fractionation, Q-Sepharose, ADP-agarose, Mono-Q and Phenyl Superose chromatography. N...