Characterization of pI(Cln) binding proteins: Identification of p17 and assessment of the role of acidic domains in mediating protein-protein interactions

Francesco Emma, Roberto Sanchez-Olea, Kevin Strange

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19 Citations (Scopus)

Abstract

pI(Cln) is a ubiquitous and abundant 27 kDa soluble protein that is localized primarily to the cytoplasm. The protein has been proposed to be a swelling-activated anion channel or a channel regulator. Recent studies, however, have cast significant doubt on these hypotheses, and the function of pI(Cln) therefore remains unknown. To further characterize the physiological role of pI(Cln), we have begun to identify the proteins that bind to it and the amino acid domains that mediate pI(Cln) protein-protein interactions. Using affinity assays and immunoprecipitation we have identified three proteins in C6 glioma cells with molecular masses of 17 kDa, 29 kDa and 72 kDa that bind selectively to pI(Cln). Microsequencing revealed that p17 is the non-muscle isoform of the alkali myosin light chain. pI(Cln) contains three acidic amino acid domains termed AD1, AD2 and AD3. Mutation of AD1 and/or AD2 had no effect on p17, p29 and p72 binding. However, binding of p72 was lost when four acidic amino acid residues were mutated in AD3, which is located at the carboxy terminus. A truncation peptide containing the last 29 amino acids of pI(Cln) was able to bind p72 normally. These results indicate that the carboxy terminus is necessary for p72-pI(Cln) interaction. Based on these and other findings, we propose that pI(Cln) is a protein responsible for regulating the structure and function of the cytoskeleton, and/or a protein involved in mediating interactions between components of intracellular signal transduction pathways. Copyright (C) 1998 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)321-328
Number of pages8
JournalBiochimica et Biophysica Acta - Molecular Cell Research
Volume1404
Issue number3
DOIs
Publication statusPublished - Sep 16 1998

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Carrier Proteins
Proteins
Acidic Amino Acids
Amino Acids
Myosin Light Chains
Cytoskeleton
Immunoprecipitation
Glioma
Anions
Signal Transduction
Protein Isoforms
Cytoplasm
Peptides
Mutation

Keywords

  • Anion channel
  • Cell volume regulation
  • Cytoskeleton
  • Signal transduction

ASJC Scopus subject areas

  • Cell Biology
  • Molecular Biology
  • Biophysics

Cite this

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title = "Characterization of pI(Cln) binding proteins: Identification of p17 and assessment of the role of acidic domains in mediating protein-protein interactions",
abstract = "pI(Cln) is a ubiquitous and abundant 27 kDa soluble protein that is localized primarily to the cytoplasm. The protein has been proposed to be a swelling-activated anion channel or a channel regulator. Recent studies, however, have cast significant doubt on these hypotheses, and the function of pI(Cln) therefore remains unknown. To further characterize the physiological role of pI(Cln), we have begun to identify the proteins that bind to it and the amino acid domains that mediate pI(Cln) protein-protein interactions. Using affinity assays and immunoprecipitation we have identified three proteins in C6 glioma cells with molecular masses of 17 kDa, 29 kDa and 72 kDa that bind selectively to pI(Cln). Microsequencing revealed that p17 is the non-muscle isoform of the alkali myosin light chain. pI(Cln) contains three acidic amino acid domains termed AD1, AD2 and AD3. Mutation of AD1 and/or AD2 had no effect on p17, p29 and p72 binding. However, binding of p72 was lost when four acidic amino acid residues were mutated in AD3, which is located at the carboxy terminus. A truncation peptide containing the last 29 amino acids of pI(Cln) was able to bind p72 normally. These results indicate that the carboxy terminus is necessary for p72-pI(Cln) interaction. Based on these and other findings, we propose that pI(Cln) is a protein responsible for regulating the structure and function of the cytoskeleton, and/or a protein involved in mediating interactions between components of intracellular signal transduction pathways. Copyright (C) 1998 Elsevier Science B.V.",
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T2 - Identification of p17 and assessment of the role of acidic domains in mediating protein-protein interactions

AU - Emma, Francesco

AU - Sanchez-Olea, Roberto

AU - Strange, Kevin

PY - 1998/9/16

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N2 - pI(Cln) is a ubiquitous and abundant 27 kDa soluble protein that is localized primarily to the cytoplasm. The protein has been proposed to be a swelling-activated anion channel or a channel regulator. Recent studies, however, have cast significant doubt on these hypotheses, and the function of pI(Cln) therefore remains unknown. To further characterize the physiological role of pI(Cln), we have begun to identify the proteins that bind to it and the amino acid domains that mediate pI(Cln) protein-protein interactions. Using affinity assays and immunoprecipitation we have identified three proteins in C6 glioma cells with molecular masses of 17 kDa, 29 kDa and 72 kDa that bind selectively to pI(Cln). Microsequencing revealed that p17 is the non-muscle isoform of the alkali myosin light chain. pI(Cln) contains three acidic amino acid domains termed AD1, AD2 and AD3. Mutation of AD1 and/or AD2 had no effect on p17, p29 and p72 binding. However, binding of p72 was lost when four acidic amino acid residues were mutated in AD3, which is located at the carboxy terminus. A truncation peptide containing the last 29 amino acids of pI(Cln) was able to bind p72 normally. These results indicate that the carboxy terminus is necessary for p72-pI(Cln) interaction. Based on these and other findings, we propose that pI(Cln) is a protein responsible for regulating the structure and function of the cytoskeleton, and/or a protein involved in mediating interactions between components of intracellular signal transduction pathways. Copyright (C) 1998 Elsevier Science B.V.

AB - pI(Cln) is a ubiquitous and abundant 27 kDa soluble protein that is localized primarily to the cytoplasm. The protein has been proposed to be a swelling-activated anion channel or a channel regulator. Recent studies, however, have cast significant doubt on these hypotheses, and the function of pI(Cln) therefore remains unknown. To further characterize the physiological role of pI(Cln), we have begun to identify the proteins that bind to it and the amino acid domains that mediate pI(Cln) protein-protein interactions. Using affinity assays and immunoprecipitation we have identified three proteins in C6 glioma cells with molecular masses of 17 kDa, 29 kDa and 72 kDa that bind selectively to pI(Cln). Microsequencing revealed that p17 is the non-muscle isoform of the alkali myosin light chain. pI(Cln) contains three acidic amino acid domains termed AD1, AD2 and AD3. Mutation of AD1 and/or AD2 had no effect on p17, p29 and p72 binding. However, binding of p72 was lost when four acidic amino acid residues were mutated in AD3, which is located at the carboxy terminus. A truncation peptide containing the last 29 amino acids of pI(Cln) was able to bind p72 normally. These results indicate that the carboxy terminus is necessary for p72-pI(Cln) interaction. Based on these and other findings, we propose that pI(Cln) is a protein responsible for regulating the structure and function of the cytoskeleton, and/or a protein involved in mediating interactions between components of intracellular signal transduction pathways. Copyright (C) 1998 Elsevier Science B.V.

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