title: Hypoxia-inducible factor 1 proteomics and diving adaptations in ringed seal.
abstract: The putative amino acid sequence of ringed seal (Phoca hispida) hypoxia-inducible factor 1alpha (HIF-1alpha) derived from DNA sequence analysis of the single-copy gene has been investigated. The rationale for these studies was to determine the reasons for the presence of HIF-1alpha at relatively high levels in seal tissues, and its possible role in protection against diving-related oxidative damage. Sequence analysis indicated that the bHLH/PAS and TAD functional domains are very similar to those in terrestrial mammals, although there were significant sequence differences between the mouse and seal proteins in a region of the ODD domain. Some of these results indicate that seal HIF-1alpha protein can bind HIF-Ibeta, DNA, transcriptional coactivators, and von Hippel-Lindau protein (pVHL). The presence of HIF-1alpha in seal tissues was not related to the absence of pVHL, which was found to be present in all seal tissues examined. It is concluded that seal HIF-1alpha may act as a transcriptional activator and that its presence in seal tissues is probably not caused by its inability to interact with pVHL. It is suggested that seal HIF-1 may serve two functions in the postdiving period, namely, to attenuate ischemia/reperfusion-induced oxidative stress and to allow efficient lung reinflation.
authors.affiliation: Department of Biomedical Sciences, Ohio University, Athens, OH 45701, USA.
authors.forename: Peter
authors.initials: P
authors.lastname: Johnson
authors.forename: Robert
authors.initials: R
authors.lastname: Elsner
authors.forename: Tania
authors.initials: T
authors.lastname: Zenteno-Savín
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D004247:DNA / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000737:chemistry* / Q000378:metabolism; D005091:Exons; D005609:Free Radicals; D051793:Hypoxia-Inducible Factor 1; D051795:Hypoxia-Inducible Factor 1, alpha Subunit; D015151:Immunoblotting; D051379:Mice; D008969:Molecular Sequence Data; D009687:Nuclear Proteins / Q000737:chemistry* / Q000378:metabolism; D018384:Oxidative Stress; D046049:Phoca; D016133:Polymerase Chain Reaction; D017434:Protein Structure, Tertiary; D040901:Proteomics / Q000379:methods*; D015427:Reperfusion Injury; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D013501:Surface-Active Agents / Q000378:metabolism; D013997:Time Factors; D014018:Tissue Distribution; D014157:Transcription Factors / Q000737:chemistry* / Q000378:metabolism; D014158:Transcription, Genetic; D015533:Transcriptional Activation; D014337:Trout; D025521:Tumor Suppressor Proteins / Q000378:metabolism; D044767:Ubiquitin-Protein Ligases / Q000378:metabolism; D051794:Von Hippel-Lindau Tumor Suppressor Protein
chemical_list: D004268:DNA-Binding Proteins; D005609:Free Radicals; C497443:Hif1a protein, mouse; D051793:Hypoxia-Inducible Factor 1; D051795:Hypoxia-Inducible Factor 1, alpha Subunit; D009687:Nuclear Proteins; D013501:Surface-Active Agents; D014157:Transcription Factors; D025521:Tumor Suppressor Proteins; D004247:DNA; D044767:Ubiquitin-Protein Ligases; D051794:Von Hippel-Lindau Tumor Suppressor Protein