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UA-4S to 52. UA-SS. Fig. UA 48. Appendix S Bolted flange. Spherical cover UA-6 Manhole cover plate. UG-11. UG-46 Flued openings. UG-32. UG-38. Fig. UG-38 Yoke. UG-11

UA45to 52, UA-S5, Fig. UA48, Appendix S Bolted flange. Spherical cover UA-6 Manhole cover plate, UG-11, UG46 Flued openings, UG-32, UG-38, Fig. UG-38 Yoke, UG-11

UA723 buck regulator with measured ESR and DCR.

UASB Treatment Train for Tomato and Bean Wastes Note both aerobic and anaerobic treatment streams in sequence.

UB3LYP 6-31G spin density distributions on non-hydrogen atoms .

Ubbelohde capillary viscometer.

Ubbelohde viscometer.

Ubbelohde viscometer. The efflux time between the time when the liquid level crosses the upper marker and the time when it crosses the lower marker is measnred.

UbcH7 c-Cbl complex .The surface of UbcH7 is shown with residues interacting with the c-Cbl RING domain shown in red and the active-site cysteine shown in yellow. c-Cbl is colored green.

UbcH7 E6AP . The surface of UbcH7 is shown with residues interacting with the E6AP HECTdomain shown in blue and the active-site cysteine shown in yellow. E6AP is colored green with the active-site cysteine between the N- and C-lobe shown in yellow.

Ubcl ubiquitin thiol ester complex model . The surface of Ubcl is shown with residues implicated in ubiquitin binding colored purple and the active-site cysteine colored yellow. Ubiquitin is colored green.

Ubcl3 . Canonical a fS E2 fold with the active-site cysteine shown in ball-and-stick.

Ubcl3 interaction surface. The interacting surfaces have been mapped onto Ubcl3. The active-site cysteine is shown in yellow. Colored surfaces contact

UBE dimethyl oxalate process.

UBE model.

Ubiquinol binding model in the Qp site. Ubiquinol was modeled based on the inhibitor-bound bc complex structures.

Ubiquinone biosynthetic pathway. Each compound in the pathway is identified by an Arabic numerai. Under anaerobic conditions, there are aiternate hydroxyiases for the three enzymes incorporating moiecuiar oxygen are drawn in the quinoi form. Some authors draw these structures in the quinone form. For other abbreviations, see the iegend of

Ubiquinone. Reiative moiecuiar mass

Ubiquinone. Relative molecular mass

Ubiquitin and endocytosis. Receptors on the plasma membrane undergo monoubiquitination as a result of ligand bound to clathrin-coated pits. Ubiquitination also functions to sort the internalized membrane protein into early endosomes, which directs them to degradation by lysosome through the multivesicular body. If ubiquitin from the endocytosed receptors is removed by an UBP, the receptor recycles back to the membrane. Proteasome inhibitors block endocytotic degradation of some proteins such as glutamate receptor subunits indicating a possible role for the proteasome.

Ubiquitin Conjugation. The ubiquitin-activating enzyme El adenylates ubiquitin and transfers the ubiquitin to one of its ovm cysteine residues. Ubiquitin is then transferred to a cysteine residue in the ubiquitin-conjugating enzyme E2. Finally, the ubiquitin-protein ligase E3 transfers the ubiquitin to a lysine residue onthe target protein.

Ubiquitin conjugation. The ubiquitm-activatlng enzyme El adenylates ubiquitin . Finally, the ubiquitin-protein ligase E3 transfers the ubiquitin to a lysine residue on the target protein 4a and 4b .

Ubiquitin proteolytic pathway. Proposed sequence of events in conjugation and degradation of proteins via ubiquitin system involves activation of ubiquitin

Ubiquitin-mediated proteolysis regulates the onset and demise of Cdk activity during the cell division cycle. The Anaphase Promoting Complex Cyclosome activity. See text for details.

Ubiquitin. The structure of ubiquitin reveals an extended carboxyl terminus that is activated and linked to other proteins. Lysine residues also are shown, including lysine 48, the major site for linking additional ubiquitin molecules.



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