Characterization of alternatively spliced and truncated forms of the Arf guanine nucleotide exchange factor GBF1 defines regions important for activity.
Biochem Biophys Res Commun
; 303(1): 160-9, 2003 Mar 28.
Article
en En
| MEDLINE
| ID: mdl-12646181
ABSTRACT
Analysis of multiple transcripts for the Arf-specific guanine nucleotide exchange factor GBF1 identified three positions displaying small in-frame deletions and insertions. Sequencing of genomic DNA for CHO GBF1 and analysis of the human gene established that those variations were consistent with alternate splicing events. RT-PCR analysis of CHO mRNA confirmed that these small in-frame deletions occurred at significant and similar frequencies in both WT and BFA resistant CHO cells. These splice variants behaved like GBF1 in biological assays based on the observation that GBF1 is cytotoxic at high levels but will confer resistance to BFA when moderately overexpressed. Comparison of variants with larger deletions defined regions of 75 (exons 5-7) and 412 (exons 31-39) amino acid residues that were required for cell killing but were dispensable for promoting BFA resistance.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Empalme Alternativo
/
Factores de Intercambio de Guanina Nucleótido
Tipo de estudio:
Prognostic_studies
Límite:
Animals
/
Humans
Idioma:
En
Revista:
Biochem Biophys Res Commun
Año:
2003
Tipo del documento:
Article