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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Journal of biomolecular NMR 7 (1996), S. 77-82 
    ISSN: 1573-5001
    Schlagwort(e): Water exchange ; NOE ; Pulsed field gradients ; Macromolecules
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Summary A technique for separating intramolecular NOE and solvent-proton exchange peaks in exchange spectroscopy is demonstrated. This method utilizes the large differences in relaxation and coupling properties of water and macromolecules to separate the two effects. The spin-echo filter consists of a water-frequency selective 90° pulse followed by a spin-echo sequence. If the echo time is sufficiently long, protein resonances (e.g. CαH protons) excited by the selective pulse are removed due to their much shorter T2 values and J-coupling evolution. By combining the filter with exchange spectroscopy (EXSY) or water exchange (WEX) filter experiments, exchange peaks can be selectively observed. In this paper the filter is combined with a modified version of the WEX filter (WEX II filter) with 1D and 2D detection and applied to a zinc finger peptide and to staphylococcal nuclease, allowing estimation of the contribution of intramolecular NOEs to the exchange spectra.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Proteins: Structure, Function, and Genetics 16 (1993), S. 306-308 
    ISSN: 0887-3585
    Schlagwort(e): rubredoxin ; lgG antibody ; lgM antibody ; immunogen ; Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The immunogenicity of a folded, all D-amino acid protein- rubredoxin, has been compared with that for the corresponding L-protein enantiomer. Following multiple administrations with alum adjuvant, the L-protein induced a strong, specific lgG antibody response, whereas the D-protein did not. This relative lack of responsiveness to the D-protein cannot be attributed to rapid excretion, since it is retained at least 4 times longer than the natural L-protein. These observations provide the first direct evidence that a folded D-amino acid protein has low immunogenicity and is long lived in vivo. Proteins with such properties may be useful as molecular platforms in a variety of chemical and pharmaco-logical applications. © 1993 Wiley-Liss, Inc.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Proteins: Structure, Function, and Genetics 12 (1992), S. 101-104 
    ISSN: 0887-3585
    Schlagwort(e): protein-DNA interactions ; hydrogen bonding ; Sp1 ; recognition code ; amino acid correlations ; protein-DNA interface ; Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: A peptide corresponding to the three zinc finger domains of the human transcription factor Sp1 has been expressed and found to bind a consensus Sp1 binding site with the sequence 5′-GGGGCGGGG-3′. Examination of the amino acid distributions within a large zinc finger sequence data base and chemical arguments suggested that a particular Arg to Gln sequence change might convert binding specificity to 5′-GGGGCAGGG-3′. Experimental tests of this hypothesis revealed that such a change could be induced only when two other sequence changes, deduced from examination of sequence correlations, were made as well. These results provide the most direct information to date about how zinc finger proteins might recognize adenine-containing binding sites and bear on the existence and nature of any code between zinc finger protein and binding site sequences.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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