Cloning, expression, and characterization of a novel guanylate-binding protein, GBP3 in murine erythroid progenitor cells.
In: Department of Medicine, 1998
academicJournal
Zugriff:
We report the molecular cloning of a novel guanylate-binding protein (GBP), termed mouse GBP3 (mGBP3) in Friend virus-induced mouse erythroid progenitor (FVA) cells. The 71-kDa mGBP3 belongs to a family of known GBPs that contain the first two consensus motifs, GXXXXGK(S/T) and DXXG, but lack the third element, (N/T)KXD, found in typical GTP-binding proteins. Recombinant mGBP3 protein, expressed using a baculovirus expression system, binds to agarose-immobilized guanine nucleotides (GTP, GDP and GMP). Moreover, mGBP3 has been found to have an intrinsic GTPase activity with K(m) and Vmax values of 77 +/- 4 microM and 21 +/- 0.5 pmol min-1 microgram-1 of protein, respectively. The mGBP3 is distinct from the other GBPs, in that it does not have an isoprenylation/methylation motif CAAX at the carboxyl terminus. The mGBP3 appears to be localized in the cytosol based on immunofluorescence staining. Although the mGBP3 transcript is expressed to a varying degree in numerous mouse tissues, the message is most abundant in FVA cells. The mGBP3 transcript increases in FVA cells undergoing differentiation to a maximum within a few hours and then decreases to an undetectable level by 24 h. These results, taken together, suggest that mGBP3 is a novel member of a family of guanylate-binding proteins, which plays a role in the erythroid differentiation. The nucleotide sequence reported in this paper has been submitted to the GenBank with accession number U44731.
Titel: |
Cloning, expression, and characterization of a novel guanylate-binding protein, GBP3 in murine erythroid progenitor cells.
|
---|---|
Autor/in / Beteiligte Person: | Han, B H ; Park, Don J, MD, PhD ; Lim, R W ; Im, J H ; Kim, H D |
Link: | |
Zeitschrift: | Department of Medicine, 1998 |
Veröffentlichung: | LVHN Scholarly Works, 1998 |
Medientyp: | academicJournal |
Schlagwort: |
|
Sonstiges: |
|