INVESTIGADORES
SERRA Esteban Carlos
artículos
Título:
Functional Analysis of the Schistosoma mansoni 28 kDa Glutathione S-Transferase Gene Promoter: Involvement of SMNF-Y Transcrition Factor in Multimeric Complexes
Autor/es:
ESTEBAN SERRA; ZEMZOUMI, KHALID; TROLET, JAQUES; CAPRON, ANDRE; DISSOUS, COLETTE
Revista:
MOLECULAR AND BIOCHEMICAL PARASITOLOGY
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Año: 1996 vol. 83 p. 80 - 80
ISSN:
0166-6851
Resumen:
The ability of the 5' flanking region of the gene encoding the 28 kDa glutathione
S-transferase of Schistosoma mansoni gene to promote transcription, was
studied in different mammalian cell lines. Results of transient
transfection assays showed a strong activity of the -277 to +1 nt region
of the Sm28GST gene, comparable to that of well-studied promoters.
Deletion analysis indicated that an AP-1 site and two closely located
CCAAT (Y1 and Y2) boxes were the principal motifs responsible for the
promoter activity. Binding of the NF-Y complex to Y1 and Y2, as well as
to a third CCAAT box (Y3) close to the promoter TATA box, was compared
in gel shift and super-shift experiments. All of the three Y boxes bound
protein complexes from S. mansoni nuclear extracts that were shown to
contain the A subunit of the schistosome NF-Y complex (SMNF-YA).
Competition assays revealed a differential affinity of the Y1, Y2 and Y3
sequences for NF-Y. The Y1, Y2 and Y3 regions were also shown to
activate transcription when included in an heterologous promoter and
data obtained strongly suggested the involvement of SMNF-Y in multimeric
complexes during this process.