Fimbrin is an actin-bundling protein found in intestinal microvilli, hair cell stereocilia, and fibroblast filopodia. The complete protein sequence (630 residues) of chicken intestine fimbrin has been determined from two full-length cDNA clones. The sequence encodes a small amino-terminal domain (115 residues) that is homologous with two calcium-binding sites of calmodulin and a large carboxy-terminal domain (500 residues) consisting of a fourfold-repeated 125-residue sequence. This repeat is homologous with the actin-binding domain of alpha-actinin and the amino-terminal domains of dystrophin, actin-gelation protein, and beta-spectrin. The presence of this duplicated domain in fimbrin links actin bundling proteins and gelation proteins into a common family of actin cross-linking proteins. Fimbrin is also homologous in sequence with human L-plastin and T-plastin. L-plastin is found in only normal or transformed leukocytes where it becomes phosphorylated in response to IL 1 or phorbol myristate acetate. T-plastin is found in cells of solid tissues where it does not become phosphorylated. Neoplastic cells derived from solid tissues express both isoforms. The differences in expression, sequence, and phosphorylation suggest possible functional differences between fimbrin isoforms.
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September 01 1990
Fimbrin is a homologue of the cytoplasmic phosphoprotein plastin and has domains homologous with calmodulin and actin gelation proteins.
M V de Arruda,
M V de Arruda
Whitehead Institute for Biomedical Research, Cambridge, Massachusetts.
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S Watson,
S Watson
Whitehead Institute for Biomedical Research, Cambridge, Massachusetts.
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C S Lin,
C S Lin
Whitehead Institute for Biomedical Research, Cambridge, Massachusetts.
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J Leavitt,
J Leavitt
Whitehead Institute for Biomedical Research, Cambridge, Massachusetts.
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P Matsudaira
P Matsudaira
Whitehead Institute for Biomedical Research, Cambridge, Massachusetts.
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M V de Arruda
Whitehead Institute for Biomedical Research, Cambridge, Massachusetts.
S Watson
Whitehead Institute for Biomedical Research, Cambridge, Massachusetts.
C S Lin
Whitehead Institute for Biomedical Research, Cambridge, Massachusetts.
J Leavitt
Whitehead Institute for Biomedical Research, Cambridge, Massachusetts.
P Matsudaira
Whitehead Institute for Biomedical Research, Cambridge, Massachusetts.
Online ISSN: 1540-8140
Print ISSN: 0021-9525
J Cell Biol (1990) 111 (3): 1069–1079.
Citation
M V de Arruda, S Watson, C S Lin, J Leavitt, P Matsudaira; Fimbrin is a homologue of the cytoplasmic phosphoprotein plastin and has domains homologous with calmodulin and actin gelation proteins.. J Cell Biol 1 September 1990; 111 (3): 1069–1079. doi: https://doi.org/10.1083/jcb.111.3.1069
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