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Identification and characterization of a RING zinc finger gene (C-RZF) expressed in chicken embryo cells.
Tranque P
,
Crossin KL
,
Cirelli C
,
Edelman GM
,
Mauro VP
.
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To identify changes in gene expression that occur in chicken embryobrain (CEB) cells as a consequence of their binding to the extracellular matrix molecule cytotactin/tenascin (CT/TN), a subtractive hybridization cloning strategy was employed. One of the cDNA clones identified was predicted to encode 381 amino acids and although it did not resemble any known sequences in the nucleic acid or protein data bases, it did contain the sequence motif for the cysteine-rich C3HC4 type of zinc finger, also known as a RING-finger. This sequence was therefore designated the chicken-RING zinc finger (C-RZF). In addition to the RING-finger, the C-RZF sequence also contained motifs for a leucine zipper, a nuclear localization signal, and a stretch of acidic amino acids similar to the activation domains of some transcription factors. Southern analysis suggested that C-RZF is encoded by a single gene. Northern and in situ hybridization analyses of E8 chicken embryo tissues indicated that expression of the C-RZF gene was restricted primarily to brain and heart. Western analysis of the nuclear and cytoplasmic fractions of chicken embryoheart cells and immunofluorescent staining of chicken embryo cardiocytes with anti-C-RZF antibodies demonstrated that the C-RZF protein was present in the nucleus. The data suggest that we have identified another member of the RING-finger family of proteins whose expression in CEB cells may be affected by CT/TN and whose nuclear localization and sequence motifs predict a DNA-binding function in the nucleus.
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