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  • 1
    ISSN: 1573-4943
    Keywords: Screening protein structures ; electroblotting ; glucose-6-phosphate dehydrogenase ; Saccharomyces cerevisiae ; Pichia jadinii
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Rapid assessment of structural relationships between yeast glucose-6-phosphate dehydrogenases and other eukaryotic types of this enzyme is described. Separation and size estimation of large fragments by sodium dodecylsulfate/polyacrylamide gel electrophoresis, electroblotting onto disks, and sequencer analysis provide data that permit alignment of the segments thus characterized with the related proteins, and utilize existing structural knowledge to assess new enzyme structures. Affinity labeling allows further correlations. The results establish the overall structural arrangements of the new proteins, including the location of the active-site lysine residue, even though the yeast enzyme structures are found to differ markedly from the few previously characterized glucose-6-phosphate dehydrogenases.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-4943
    Keywords: β-chain ; hemoglobin ; rose-ringed parakeet ; structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The primary structure of Rose-ringed Parakeet hemoglobin β-chain was established, completing the analysis of this hemoglobin. Comparisons with other avian β-chains show variations smaller than those for the corresponding α-chains. There are 11 amino acid exchanges in relationship to the only other characterized psittaciform β-chain, and a total of 35 positions are affected by differences among all avian β-chains analyzed (versus 61 for the α-chains). At three positions, the Psittacula β-chain has residues unique to this species. Three α1β1 contacts are modified, by substitutions at positions β51, β116, and β125.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-4943
    Keywords: hemoglobin ; structural analysis ; molecular evolution ; avian relationships
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The structure of the hernoglobin α-chain of Rose-ringed Parakeet was determined by sequence degradations of the intact subunit, the CNBr fragments, and peptides obtained by digestion with staphylococcal Glu-specific protease and trypsin. Using this analysis, the complete α-chain structure of 21 avian species is known, permitting comparisons of the protein structure and of avian relationships. The structure exhibits differences from previously established avian α-chains at a total of 61 positions, five of which have residues unique to those of the parakeet (Ser-12, Gly-65, Ser-67, Ala-121, and Leu-134). The analysis defines hemoglobin variation within an additional avian order (Psittaciformes), demonstrates distant patterns for evaluation of relationships within other avian orders, and lends support to taxonomic conclusions from molecular data.
    Type of Medium: Electronic Resource
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