Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: EC:2.3.1.28 (chloramphenicol acetyltransferase)
 5,100 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

A 240-bp DNA fragment encoding a peptide, designated ENV(80), homologous to a conserved part of the gp41 transmembrane glycoprotein of human immunodeficiency virus (HIV) was chemically synthesized and inserted into different plasmid expression vectors. Escherichia coli transformants containing these plasmid constructs produced upon induction high amounts of either an ENV(80) peptide of relative molecular mass (Mr) of 10,000 or the same ENV(80) peptide N-terminally fused to E. coli chloramphenicol acetyltransferase (CAT) or to mouse dihydrofolate reductase (DHFR) having Mr of 36,000 and 31,000 respectively. All polypeptides containing the ENV(80) sequences were strongly reactive with antibodies present in sera from AIDS virus-infected individuals, but not with control sera. The strategy of gene assembly allowed the expression of ENV(80) subfragments fused to DHFR. The serodiagnosis of 15 positive sera by Western blot analysis using these bacterially synthesized ENV(80) subfragments revealed the presence of several immunoreactive epitopes on the 80-amino acid polypeptide which were recognized differently by the various patients.
 ...
PMID:Subregions of a conserved part of the HIV gp41 transmembrane protein are differentially recognized by antibodies of infected individuals. 349 55

Oestrogen, progesterone and paracrine signals from the embryo have been associated with the overall control of implantation. Changes in the expression of the heavily glycosylated transmembrane glycoprotein MUC1 mucin on the endometrial epithelium are also thought to be important for embryo attachment. Increased MUC1 expression has been correlated with elevated progesterone levels in the secretory phase of the menstrual cycle. Embryonic control of endometrial receptivity through changes in MUC1 expression could be achieved through the interleukin-1 system. Four endometrial epithelial cell lines (HEC1A, HEC1B, Ishikawa and RL592) were treated with oestrogen and progesterone (with or without interleukin-1-beta) and were subjected to immunocytochemistry and flow cytometric analysis to determine MUC1 production using MUC1 antibodies. HEC1A (oestrogen receptor (ER) and progesterone receptor (PR) positive) and HEC1B (ER positive and PR negative) were transfected with the MUC1 promoter, underwent similar treatment regimes and the activity of the MUC1 promoter relative to their untreated controls was determined using a chloramphenicol acetyltransferase (CAT) enzyme-linked immunoassay. Using the cell lines, we determined that endometrial MUC1 expression is up-regulated by progesterone, consistent with the in vivo increases in MUC1 related to high progesterone levels. We also revealed that neither oestrogen, nor interleukin-1-beta, appear to modulate MUC1. Progesterone-dependent regulation of MUC1 is likely to be an important factor in determining endometrial receptivity.
 ...
PMID:The effects of sex steroid hormones and interleukin-1-beta on MUC1 expression in endometrial epithelial cell lines. 1659 24