Dephosphorylation of Sp1 by protein phosphatase 1 is involved in the glucose-mediated activation of the acetyl-CoA carboxylase gene

Samira Daniel, Shaoying Zhang, Anna De Paoli-Roach, Ki Han Kim

Research output: Contribution to journalArticle

130 Citations (Scopus)

Abstract

When mouse 30A5 preadipocytes are exposed to high glucose concentrations, acetyl-CoA carboxylase is induced through glucose activation of promoter II of the acetyl-CoA carboxylase gene. Glucose treatment of the cells increases Sp1 binding to two GC-rich glucose response elements in promoter II. We have investigated the mechanism by which glucose increases Sp1 binding and transactivation of promoter II in 30A5 cells. DNA mobility shift assays have shown that nuclear extracts from glucose-treated cells exhibit increased Sp1 binding activity. This increase in the binding activity is not due to glucose-mediated changes in the amount of Sp1 in the nucleus but to an increase in the activity that modifies Sp1 so that it binds more effectively to the promoter sequence. This Sp1 modifying activity is inhibited by okadaic acid and phosphatase inhibitor 2, and has a molecular mass of 38-42 kDa. The catalytic subunit of type 1 protein phosphatase, whose molecular mass is 38 kDa, also increased the ability of Sp1 to bind to promoter II. Treatment of nuclear extract with antibodies against the catalytic subunit partially suppressed the nuclear activity for Sp1 activation. From these results, we conclude that the Sp1 transcription factor exhibits enhanced binding to promoter II and transcriptional activation is the result of glucose-induced dephosphorylation by type 1 phosphatase.

Original languageEnglish
Pages (from-to)14692-14697
Number of pages6
JournalJournal of Biological Chemistry
Volume271
Issue number25
DOIs
StatePublished - 1996

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Protein Phosphatase 1
Acetyl-CoA Carboxylase
Genes
Chemical activation
Glucose
Molecular mass
Transcriptional Activation
Cells
Sp1 Transcription Factor
Okadaic Acid
Response Elements
Electrophoretic Mobility Shift Assay
Acid Phosphatase
Phosphoric Monoester Hydrolases
Assays
Catalytic Domain
Antibodies
DNA

ASJC Scopus subject areas

  • Biochemistry

Cite this

Dephosphorylation of Sp1 by protein phosphatase 1 is involved in the glucose-mediated activation of the acetyl-CoA carboxylase gene. / Daniel, Samira; Zhang, Shaoying; De Paoli-Roach, Anna; Kim, Ki Han.

In: Journal of Biological Chemistry, Vol. 271, No. 25, 1996, p. 14692-14697.

Research output: Contribution to journalArticle

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