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  • Biochemistry and Biotechnology  (3)
  • N-terminal processing  (1)
  • Pectinesterase  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Modification of tomato andAspergillus niger pectinesterases with diethyl pyrocarbonate (1996)
    Springer
    The protein journal 15 (1996), S. 127-130 
    Details
    ISSN: 1573-4943
    Keywords: Pectinesterase ; tomato ; Aspergillus niger ; histidine modification ; diethyl pyrocarbonate ; inhibition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The role of histidine residues in pectinesterases was evaluated by monitoring the sensitivity to modification with diethyl pyrocarbonate in the tomato andAspergillus niger enzymes. Different and incomplete losses of enzyme activity were obtained. Inactivation of the enzymes was proportional to the histidine content (two in the tomato T1 form, six in theAspergillus form), suggesting that accessible histidine residues do not have active-site functions in these pectinesterases, but contribute to the overall structural stability. Lack of His roles in common between the enzyme forms is in agreement with the structures of pectinesterases having no conserved His residues.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01887393
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Expression inEscherichia coli of active human alcohol dehydrogenase lacking N-terminal acetylation (1987)
    Springer
    Bioscience reports 7 (1987), S. 969-974 
    Details
    ISSN: 1573-4935
    Keywords: alcohol dehydrogenase ; expression plasmid ; immunodetection ; N-terminal processing ; E. coli
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Human alcohol dehydrogenase (ADH, tiff isozyme of class I) was expressed in Escherichia coli, purified to homogeneity, and characterized regarding N-terminal processing. The expression system was obtained by ligation of a cDNA fragment corresponding to the fl-subunit of human liver alcohol dehydrogenase into the vector pKK 223-3 containing the tac promoter. The enzyme, detected by Western-blot analysis and ethanol oxidizing activity, constituted up to 3 ~o of the total amount of protein. Recombinant ADH was separated from E. coli ADH by ion-exchange chromatography and the isolated enzyme was essentially pure as judged by SDS-polyacrylamide gel electrophoresis and sequence analysis. The N-terminal sequence was identical to that of the authentic fl-subunit except that the N-terminus was non-acetylated, indicating a correct removal of the initiator methionine, but lack of further processing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01122131
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Thiol proteases and aldehyde dehydrogenases: Evolution from a common thiolesterase precursor? (1991)
    New York, NY : Wiley-Blackwell
    Proteins: Structure, Function, and Genetics 11 (1991), S. 176-183 
    Details
    ISSN: 0887-3585
    Keywords: active site model ; thiolester mechanism ; multiple alignment ; three-dimensional correlations ; conservation of glycines ; conservation of functional cysteines ; conservation of salt bridges ; exon boundaries ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The C-terminal 222 residues of human liver aldehyde dehydrogenase can be aligned with the C-terminal 226 residues of a thiol protease from Dictyostelium discoideum to yield 47 residue identities, including matching active site cysteine residues. A multiple alignment with three more aldehyde dehydrogenases and three more thiol proteases yields three regions with clustered residue similarities. In the tertiary structure of papain, these three regions are in close proximity although widely separated in primary structure, and many conserved residues are located in the active site groove. The three-dimensional relationships, the common thiol ester mechanisms of the enzymes, the locations of exon boundaries in the dehydrogenase and protease genes, and the conservation of internal salt-bridging and disulfide-paired residues in papain, all appear compatible with the hypothesis of an ancestral relationship between thiol proteases and aldehyde dehydrogenases.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prot.340110303
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  • 4
    Electronic Resource
    Electronic Resource
    Electroblotting of polypeptides onto glass fiber filters for direct sequence analysis after sodium dodecyl sulfate-polyacrylamide gel electrophoresis (1990)
    Weinheim : Wiley-Blackwell
    Electrophoresis 11 (1990), S. 569-572 
    Details
    ISSN: 0173-0835
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: The technique of electroblotting polypeptides onto Polybrene-treated glass fiber filter discs after protein detection with potassium chloride is evaluated further with different proteins in separate applications. The number of proteins analyzed with this method is now more than double that previously reported. Reproducible results in good yield are obtained. Average overall yield - including the electrophoretic step before blotting - is 26 %, with maximal recoveries through all steps up to 60 %. High sensitivity radiosequence analysis is also applicable. Recent modification of the previously described procedure include use of Whatman glass fiber filters, removal of air in the Polybrene-impregnated filters by buffer penetration under reduced pressure, and use of widely different times for electrotransfer. Special advantages with this method are low extent of protein α-amino group destruction, direct use of the entire filter in the sequencer, and insensitivity to variations in electroblotting time. Gas-phase hydrolysis in situ of blotted proteins followed by amino acid analysis is known to give a low yield of polar amino acids, and often artifacts, but can still give an estimate of the amount of polypeptide immobilized on the filter. A wash with n-butyl chloride is now shown to reduce the Polybrene-associated artifacts, and an addition of sodium chloride to increase the recovery of polar amino acids. These two steps therefore appear interesting in schemes for compositional analyses of electroblotted proteins.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.1150110707
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  • 5
    Electronic Resource
    Electronic Resource
    Analysis of polypeptide expression in benign and malignant human breast lesions (1997)
    Weinheim : Wiley-Blackwell
    Electrophoresis 18 (1997), S. 582-587 
    Details
    ISSN: 0173-0835
    Keywords: Breast ; Tumor ; Two-dimensional polyacrylamide gel electrophoresis ; Polypeptide expression ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Results of two-dimensional electrophoresis (2-DE) analyses of human breast carcinoma are described. Tumor cells were extracted and purified from breast carcinomas with different proliferative indeces and degrees of genomic stability. Cells purified from fibroadenoma tissue served as controls for benign cells. The following results were observed: (i) Analysis of samples from different areas of the same tumor showed a high degree of similarity in the pattern of polypeptide expression. Similarly, analysis of two tumors and their metastases revealed similar 2-DE profiles. (ii) In contrast, large variations were observed between different lesions with comparable histological characteristics. Larger differences in polypeptide expression were observed between potentially highly malignant carcinomas compared to comparisons of less malignant lesions. These differences were in the same order of magnitude as those observed comparing a breast carcinoma to a lung carcinoma. (iii) The levels of all cytokeratin forms resolved (CK7, CK8, CK15, and CK18) were significantly lower in carcinomas compared to fibroadenomas. (iv) The levels of high molecular weight tropomyosins (1-3) were lower in carcinomas compared to fibroadenomas. The expression of tropomyosin-1 was found to be 1.7-fold higher in primary tumors with metastatic spread to axillar lymph nodes compared to primary tumors with no evidence of metastasis (p 〈 0.05). (v) The expression of proliferating cell nuclear antigen (PCNA) and some members of the stress protein family (pHSP60, HSP90, and calreticulin) were higher in carcinomas. We conclude that malignant progression of breast carcinomas results in large heterogeneity in polypeptide expression between different tumors, but that some common themes such as decreased expression of cytokeratin and tropomyosin polypeptides can be discerned.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.1150180341
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