UDP-glucose:glycoprotein glucosyltransferase (UGGT1) promotes substrate solubility in the endoplasmic reticulum
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A new strategy using tandem 18O stable isotope labeling (TOSIL) to quantify the N-glycosylation site occupancy is reported. Three heavy oxygen atoms are introduced into N-glycosylated peptides: two 18O atoms are incorporated into the carboxyl terminal of a ...
The description at at. level of protein folding is an ambitious goal in biophysics, particularly because of the difficulty in obtaining structural information on unfolded states. Computer simulations can contribute in achieving this goal. Here we report th ...
Intrachain diffusion processes play an important role in protein folding and function. In this chapter we discuss the application of triplet-triplet energy transfer to directly measure rate constants for intrachain contact formation in polypeptide chains. ...
As protein folding is an imperfect process, the endoplasmic reticulum (ER) contains folding as well as ER-associated degradation (ERAD) machineries. In order to prevent premature interruption of folding, ERAD regulators and effectors such as EDEM1 and OS-9 ...
Systemic hyalinosis is an autosomal recessive disease that encompasses two allelic syndromes, infantile systemic hyalinosis (ISH) and juvenile hyaline fibromatosis (JHF), which are caused by mutations in the CMG2 gene. Here we have analyzed the cellular co ...
The central region of the matrix protein p17 of HIV-1 is known to be essential during virus assembly. We substituted alanines for amino acid triplets in this region of p17 (amino acid residues 47 to 55: NPG LLE TSE). Introduction of the respective mutation ...
Hsp70-Hsp40-NEF and possibly Hsp100 are the only known molecular chaperones that can use the energy of ATP to convert stably pre-aggregated polypeptides into natively refolded proteins. However, the kinetic parameters and ATP costs have remained elusive be ...
A recombinant avidin-producing Mut(+) Pichia pastoris strain was used as a model organism to study the influence of the methanol feeding strategy on the specific product productivity (q(p)) and protein glycosylation. Fed-batch cultivations performed at var ...
Intrachain loop formation allows unfolded polypeptide chains to search for favorable interactions during protein folding. We applied triplet-triplet energy transfer between a xanthone moiety and naphthylalanine to directly measure loop formation in various ...
The conformational search for favorable intramolecular interactions during protein folding is limited by intrachain diffusion processes. Recent studies on the dynamics of loop formation in unfolded polypeptide chains have focused on loops involving residue ...
