Gene structure and characterization of the murine homologue of the B cell-specific transcriptional coactivator OBF-1
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Gene structure and characterization of the murine homologue of the B cell-specific transcriptional coactivator OBF-1. / Schubart, D B; Sauter, P; Massa, S; Friedl, E M; Schwarzenbach, H; Matthias, P.
In: NUCLEIC ACIDS RES, Vol. 24, No. 10, 15.05.1996, p. 1913-20.Research output: SCORING: Contribution to journal › SCORING: Journal article › Research › peer-review
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TY - JOUR
T1 - Gene structure and characterization of the murine homologue of the B cell-specific transcriptional coactivator OBF-1
AU - Schubart, D B
AU - Sauter, P
AU - Massa, S
AU - Friedl, E M
AU - Schwarzenbach, H
AU - Matthias, P
PY - 1996/5/15
Y1 - 1996/5/15
N2 - The B cell-specific activity of immunoglobulin (Ig) gene promoters is to a large extent mediated by the conserved octamer motif ATTTGCAT. This requires the DNA binding octamer factors Oct-1 and/or Oct-2, as well as an additional B cell-restricted non-DNA binding cofactor. We recently cloned such a coactivator specific for Oct-1 or Oct-2 from human B cells and called it OBF-1. Here we report the isolation and characterization of the murine homologue. Full-length cDNA clones as well as genomic clones were isolated and the gene structure was determined. The deduced protein sequence shows that the mouse protein has an identical length, is likewise proline rich and shows 89% overall identity to the human protein. The OBF-1 gene is expressed in a very highly B cell-specific manner and is transcribed in cells representative of all stages of B cell differentiation, including the earliest ones. We show that OBF-1 interacts in the absence of DNA with the POU domain of Oct-1 or Oct-2 and also with the general transcription factors TBP and TFIIB. Furthermore, we demonstrate that although OBF-1 efficiently activates promoter octamer sites, it does not activate enhancer octamer sites.
AB - The B cell-specific activity of immunoglobulin (Ig) gene promoters is to a large extent mediated by the conserved octamer motif ATTTGCAT. This requires the DNA binding octamer factors Oct-1 and/or Oct-2, as well as an additional B cell-restricted non-DNA binding cofactor. We recently cloned such a coactivator specific for Oct-1 or Oct-2 from human B cells and called it OBF-1. Here we report the isolation and characterization of the murine homologue. Full-length cDNA clones as well as genomic clones were isolated and the gene structure was determined. The deduced protein sequence shows that the mouse protein has an identical length, is likewise proline rich and shows 89% overall identity to the human protein. The OBF-1 gene is expressed in a very highly B cell-specific manner and is transcribed in cells representative of all stages of B cell differentiation, including the earliest ones. We show that OBF-1 interacts in the absence of DNA with the POU domain of Oct-1 or Oct-2 and also with the general transcription factors TBP and TFIIB. Furthermore, we demonstrate that although OBF-1 efficiently activates promoter octamer sites, it does not activate enhancer octamer sites.
KW - Amino Acid Sequence
KW - Animals
KW - B-Lymphocytes
KW - Base Sequence
KW - Cell Differentiation
KW - DNA
KW - DNA-Binding Proteins
KW - Enhancer Elements, Genetic
KW - Gene Expression
KW - Homeodomain Proteins
KW - Host Cell Factor C1
KW - Humans
KW - Infant, Newborn
KW - Mice
KW - Molecular Sequence Data
KW - Octamer Transcription Factor-1
KW - Octamer Transcription Factor-2
KW - POU Domain Factors
KW - Promoter Regions, Genetic
KW - Sequence Homology
KW - Trans-Activators
KW - Transcription Factors
M3 - SCORING: Journal article
C2 - 8657574
VL - 24
SP - 1913
EP - 1920
JO - NUCLEIC ACIDS RES
JF - NUCLEIC ACIDS RES
SN - 0305-1048
IS - 10
ER -
