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4 Acta Biochimica Polonica

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The participation of ribosomes in protein glycosylation. Interaction of the ribosome-UDP-N-acetyl-glucosamine complex with dolichol phosphate

100%

Paszkiewicz-Gadek A. , Porowska H. , Gałasiński W.

Acta Biochimica Polonica

1992

tom 39

nr 3

251-264

The participation of ribosome-UDP-GalNAc complex in the initiation of protein glycosylation in vitro

100%

Paszkiewicz-Gadek A. , Porowska H. , Gindzieński A.

Acta Biochimica Polonica

2000

tom 47

nr 2

421-426

The gastric epithelial cells ribosome-UDP-GalNAc complex is a donor of UDP- GalNAc as the substrate for N-acetylgalactosaminyltransferase, which catalyse the transfer of GalNAc residue to the polypeptide, existing on polysomes. It was observed that the deglycosylated porcine mucin and synthetic peptide (PTSSPIST) can be also glycosylated with participation of N-acetylgalactosaminyltransferase and ribosome- UDP-GalNAc complex. The probability of the ribosome-UDP-GalNAc complex as an intermediate in the O-glycosylation is considered.

Activity of partially purified UDP-N-acetyl-α-D-galacto- samine:polypeptide N-acetylgalactosaminyltransferase with different peptide acceptors

100%

Porowska H. , Paszkiewicz-Gadek A. , Gindzieński A.

Acta Biochimica Polonica

1999

tom 46

nr 2

365-370

Glutathione reductase activity correlates with concentration of extracellular matrix degradation products in synovial fluid from patients with joint diseases

75%

Średzińska K. , Galicka A. , Porowska H. , Średziński Ł. , Porowski T. , Popko J.

Acta Biochimica Polonica

2009

tom 56

nr 4

635-640

The mechanisms underlying cartilage matrix degradation in joint diseases is not fully understood but reactive oxygen species are implicated as main causative factors. Comparative studies of glutathione reductase (GR) activity in synovial fluid from patients with rheumatoid arthritis (RA), reactive arthritis (ReA) and osteoarthritis (OA) as well as correlations between GR activity and concentration of the major cartilage components in synovial fluid are presented in this study. We found significantly higher activity of GR in RA (about three-fold) and ReA (about two-fold) than in OA. In RA and ReA patients, GR activity in synovial fluid correlates negatively with the concentrations of collagen and degradation products of sulfated glycosaminoglycans. In OA patients the activity of GR was significantly lower than in RA and ReA, which positively correlated with the concentration of collagen and showed a tendency for positive correlation with the degradation products of sulfated glycosaminoglycans. Our results suggest that in RA and ReA patients increased activity of GR does not prevent the increased degradation of collagen and proteoglycans by ROS.