pubmed:abstractText |
A guanine nucleotide exchange factor (GEF), catalyzing the exchange of GDP bound to initiation factor eIF-2 for GTP, has been isolated from S3 HeLa cells as the eIF-2 X GEF complex and extensively purified by procedures originally developed for purification of GEF from rabbit reticulocytes. The HeLa cell factor resembles rabbit reticulocyte eIF-2 X GEF in polypeptide composition, catalytic activity, and inactivation by alpha-phosphorylated eIF-2.
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