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Treatment of developing bean cotyledons with the inhibitor of N-glycosylation tunicamycin enhanced the synthesis of at least two polypeptides with molecular mass 78 kDa and 97 kDa. Pulse-chase experiments and subcellular fractionation indicated that these are endoplasmic reticulum (ER) residents. The 78 kDa protein is a major component of the ER protein(More)
Novel hirudin variants isolated from the leech Hirudinaria manillensis, a leech more specialized for mammalian parasitism, are described. Isolation of antithrombin polypeptides was performed by ion-exchange chromatographies followed by an affinity chromatography step on immobilized thrombin. The major active component, antithrombin polypeptide peak 2 (HM2)(More)
The gene coding for aspartate aminotransferase (EC 2.6.1.1) has been cloned from the extreme thermoacidophilic archaebacterium Sulfolobus solfataricus strain MT4. Partial sequence data obtained directly from the purified protein and from the two cyanogen-bromide-generated peptides confirm the primary structure of aspartate aminotransferase inferred from the(More)
We have isolated and sequenced partial cDNA clones that encode SO-6, a ribosome-inactivating protein from Saponaria officinalis. A cDNA library was constructed from the leaves of this plant and screened with synthetic oligonucleotide probes representing various portions of the protein. The deduced amino acid sequence shows the signal peptide and a coding(More)
The iron-superoxide dismutase in the thermoacidophilic archaeon Sulfolobus solfataricus has a homodimeric structure with a metal content of 0.7 atom of iron per subunit. The enzyme is insensitive to cyanide inhibition, sensitive to inactivation by H2O2 and is the most heat resistant SOD known so far being its half-life 2 h at 100 degrees C. Its primary(More)
A veratryl alcohol oxidase (VAO) enzyme was discovered in cultures of Pleurotus ostreatus. The enzyme, which oxidizes veratryl alcohol to veratraldehyde reducing O2 to H2O2, was purified to homogeneity and its main structural and catalytic properties have been determined. The enzyme is a glycoprotein and contains FAD as a prosthetic group. The amino acid(More)
The hyperthermophilic archaeon (formerly archaebacterium) Thermococcus litoralis grows at temperatures up to 98 degrees C using peptides and proteins as the sole sources of carbon and nitrogen. Cell-free extracts of the organism contained two distinct types of aromatic aminotransferases (EC 2.6.1.57) which were separated and purified to electrophoretic(More)
The primary structures of ovine alpha s1-casein variants A, C and D (formerly called Welsh variant) were determined. Separation of variants from whole casein was achieved using a fast and reliable reversed-phase HPLC method. Extended structural characterization of the purified proteins using electrospray mass spectrometry, automated Edman degradation and(More)
Saporin-6 is a single-chain ribosome inactivating protein (RIP) from the seeds and the leaves of Saponaria officinalis (Caryophyllaceae). Here we have identified the COOH-terminal end of mature Saporin-6 and, by cDNA sequencing, the predicted carboxyl-terminal sequence of a leaf Saporin-6 primary translation product. Our data indicate that the characterized(More)