Results 71 to 80 of about 2,106,963 (290)

Export of honeybee prepromelittin in Escherichia coli depends on the membrane potential but does not depend on proteins secA and secY [PDF]

, 1989
Honeybee prepromelittin (70 amino acid residues), the precursor of an eukaryotic secretory protein, and a hybrid protein between prepromelittin and mouse dihydrofolate reductase (257 amino acid residues) were expressed in Escherichia coli and ...
Cobet, Werner W. E., Mollay, Christa, Müller, Günter, Zimmermann, Richard   +3 more
core  

The (Glg)ABCs of cyanobacteria: modelling of glycogen synthesis and functional divergence of glycogen synthases in Synechocystis sp. PCC 6803

FEBS Letters, EarlyView.
We reconstituted Synechocystis glycogen synthesis in vitro from purified enzymes and showed that two GlgA isoenzymes produce glycogen with different architectures: GlgA1 yields denser, highly branched glycogen, whereas GlgA2 synthesizes longer, less‐branched chains.
Kenric Lee, Dimitrios Bekiari, Sofia Doello, Karl Forchhammer   +3 more
wiley   +1 more source

Structural biology of ferritin nanocages

FEBS Letters, EarlyView.
Ferritin is a conserved iron‐storage protein that sequesters iron as a ferric mineral core within a nanocage, protecting cells from oxidative damage and maintaining iron homeostasis. This review discusses ferritin biology, structure, and function, and highlights recent cryo‐EM studies revealing mechanisms of ferritinophagy, cellular iron uptake, and ...
Eloise Mastrangelo, Flavio Di Pisa
wiley   +1 more source

Synthesis of aza-phenylalanine, aza-tyrosine, and aza-tryptophan precursors via hydrazine alkylation; pp. 168–178 [PDF]

Proceedings of the Estonian Academy of Sciences, 2015
Aza-amino acid precursors with an aromatic side chain were synthesized using hydrazine alkylation. This synthetic pathway avoided use of hydrogen gas and expensive hydrogenation catalysts. For the optimization of this alkylation reaction various solvents
Anton Mastitski, Tõiv Haljasorg, Karin Kipper, Jaak Järv   +3 more
doaj   +1 more source

Tau acetylation at K331 has limited impact on tau pathology in vivo

FEBS Letters, EarlyView.
We mapped tau post‐translational modifications in humanized MAPT knock‐in mice and in amyloid‐bearing double knock‐in mice. Acetylation within the repeat domain, particularly around K331, showed modest increases under amyloid pathology. To test functional relevance, we generated MAPTK331Q knock‐in mice.
Shoko Hashimoto, Yukio Matsuba, Mika Takahashi, Takaomi C. Saido   +3 more
wiley   +1 more source

Water chemistry and soil radon survey at the Poas volcano (Costa Rica)

Annals of Geophysics, 2005
Radon-in-soil monitoring at the Poas volcano (Costa Rica) has been performed together with water chemistry from the hot crater lake since 1981 and 1983 respectively.
J. L. Seidel, M. Monnin, E. Fernandez, J. Barquero, N. Segovia   +4 more
doaj   +1 more source

On the Nature of Precursors in the Radio Pulsar Profiles

, 2007
In the average profiles of several radio pulsars, the main pulse is accompanied by the preceding component. This so called precursor is known for its distinctive polarization, spectral, and fluctuation properties.
Blandford R. D., Fowler L. A., Fowler L. A., Gil J. A., Lyubarskii Yu. E., McCulloch P. M., S. A. Petrova   +6 more
core   +1 more source

Requirement of a Membrane Potential for the Posttranslational Transfer of Proteins into Mitochondsria [PDF]

, 1982
Posttranslational transfer of most precursor proteins into mitochondria is dependent on energization of the mitochondria. Experiments were carried out to determine whether the membrane potential or the intramitochondrial ATP is the immediate energy ...
Conboy J. G., Cote C., Daniels C. J., Data T., Date T., Enequist H. G., Graven S. N., Hallermayer G., Harmey M. A., Harmey M. A., Heldt H. W., Heytler P. G., Josefson L. G., Kekssler S. W., Korb H., Kovac L., Laemmli U. K., Lambowitz A. M., Lambowitz A. M., Maccechini M.-L., Matsuura S., Michel R., Mori M., Mori M., Nelson N., Passarella S., Pelham H. R. B., Raymond Y., Sebald W., Sebald W., Stigall D. L., Subik J., Tzagoloff A., Vignais P. V., Weiss H., Zimmermann R., Zimmermann R., Zimmermann R.   +37 more
core   +1 more source

A methionine‐lined active site governs carbocation stabilization and product specificity in a bacterial terpene synthase

FEBS Letters, EarlyView.
This study reveals a unique active site enriched in methionine residues and demonstrates that these residues play a critical role by stabilizing carbocation intermediates through novel sulfur–cation interactions. Structure‐guided mutagenesis further revealed variants with significantly altered product profiles, enhancing pseudopterosin formation. These
Marion Ringel, Carl P. O. Helmer, Shani Zev, Ronja Driller, Emily Buhr, Markus Reinbold, Renana Schwartz, Gabriel Foley, Mikael Boden, Daniel Garbe, Gerhard Schenk, Dan Thomas Major, Bernhard Loll, Thomas Brück   +13 more
wiley   +1 more source

The processing peptidase of yeast mitochondria [PDF]

, 1988
Two proteins co-operate in the proteolytic cleavage of mitochondrial precursor proteins: the mitochondrial processing peptidase (MPP) and the processing enhancing protein (PEP).
Cheng, Ming Yuan, Hartl, Franz-Ulrich, Horwich, Arthur, Neupert, Walter, Ostermann, Joachim, Pollock, Robert A.   +5 more
core