923 resultados para HD9857.N5 N5
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Rb protein inhibits both cell cycle progression and apoptosis. Interaction of specific cellular proteins, including E2F1, with Rb C-terminal domains mediates cell cycle regulation. In contrast, the nuclear N5 protein associates with an Rb N-terminal domain with unknown function. The N5 protein contains a region of sequence similarity to the death domain of proteins involved in apoptotic signaling. We demonstrate here that forced N5 expression potently induces apoptosis in several tumor cell lines. Mutation of conserved residues within the death domain homology compromise N5-induced apoptosis, suggesting that it is required for normal function. Endogenous N5 protein is specifically altered in apoptotic cells treated with ionizing radiation. Furthermore, dominant interfering death domain mutants compromise cellular responses to ionizing radiation. Finally, physical association with Rb protein inhibits N5-induced apoptosis. We propose that N5 protein plays a role in the regulation of apoptosis and that Rb directly coordinates cell proliferation and apoptosis by binding specific proteins involved in each process through distinct protein binding domains.
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Mammalian electron transfer flavoproteins (ETF) are heterodimers containing a single equivalent of flavin adenine dinucleotide (FAD). They function as electron shuttles between primary flavoprotein dehydrogenases involved in mitochondrial fatty acid and amino acid catabolism and the membrane-bound electron transfer flavoprotein ubiquinone oxidoreductase. The structure of human ETF solved to 2.1-Å resolution reveals that the ETF molecule is comprised of three distinct domains: two domains are contributed by the α subunit and the third domain is made up entirely by the β subunit. The N-terminal portion of the α subunit and the majority of the β subunit have identical polypeptide folds, in the absence of any sequence homology. FAD lies in a cleft between the two subunits, with most of the FAD molecule residing in the C-terminal portion of the α subunit. Alignment of all the known sequences for the ETF α subunits together with the putative FixB gene product shows that the residues directly involved in FAD binding are conserved. A hydrogen bond is formed between the N5 of the FAD isoalloxazine ring and the hydroxyl side chain of αT266, suggesting why the pathogenic mutation, αT266M, affects ETF activity in patients with glutaric acidemia type II. Hydrogen bonds between the 4′-hydroxyl of the ribityl chain of FAD and N1 of the isoalloxazine ring, and between αH286 and the C2-carbonyl oxygen of the isoalloxazine ring, may play a role in the stabilization of the anionic semiquinone. With the known structure of medium chain acyl-CoA dehydrogenase, we hypothesize a possible structure for docking the two proteins.
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Zooplankton samples were taken in five depth strata using a Multinet type Midi, with 50 µm nets. The samples were taken during the second leg only, three times at station 1, two times at station 2 and once at station 3. Zooplankton were identified to species / genus and life-stage, and at least 300 individuals were counted per sample. 10 individuals of each stage / species were measured and the numbers of eggs counted.
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Presented are physical and biological data for the region extending from the Barents Sea to the Kara Sea during 158 scientific cruises for the period 1913-1999. Maps with the temporal distribution of physical and biological variables of the Barents and Kara Seas are presented, with proposed quality control criteria for phytoplankton and zooplankton data. Changes in the plankton community structure between the 1930s, 1950s, and 1990s are discussed. Multiple tables of Arctic Seas phytoplankton and zooplankton species are presented, containing ecological and geographic characteristics for each species, and images of live cells for the dominant phytoplankton species.
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Publisher's advertisements and excerpts from other works by F. Accum on p. [i]-xxiii (3rd group) and p. [1] (at end).
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Contiene: Lettre de M. Bellin, ingenieur de la Marine, a M. l'abbé Prevost. - Premiere partie, Livre quatriéme, Premiers voyages des anglois aux Indes Orientales, entrepris par une compagnie de marchands. - [ Se incluyen los viajes de los ingleses: Sir Henri Middleton 1610-1612, Dounton 1610-1615, Hippon 1611-12, Floris 1611-15, Castleton 1612-14, Saris 1611-1614].
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Premiere partie, Suite du Livre IXe et de la description de la Guinée contenant la géographie & l'histoire naturelle & civile du pays.
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Contiene: Premiere partie, Livre second, Description de la Chine, contenant la géographie, & l'histoire civile & naturelle du pays.
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Contiene: Premiere partie, Suite du Livre III, Description de la Tartarie orientale et du Tibet.
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Contiene: Seconde partie, Livre premier, Voyages des hollandois aux Indes Orientales. - [Se incluyen los relatos de Matelief en 1606-8, Van Caerden en 1607-8, Verhoeven en 1608-10, Bontekoe en 1619, 1622 y 1624-5, Vandenbroeck en 1614-1620, 1629].
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Contiene: Troisieme partie, Livre sixieme, Suite de la conquete du Perou. [Se incluyen los relatos de: De la Gasca 1546-50].
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Mode of access: Internet.
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Mode of access: Internet.
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Running title, Vols. 11-12, 19-20, 24-29, 31: Extracts from American newspapers relating to New Jersey, 1704-1775.