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Research ArticleArticle

Regions on Adenylyl Cyclase VII Required for Selective Regulation by the G13 Pathway

Lily I. Jiang, Jennifer E. Wang and Paul C. Sternweis
Molecular Pharmacology March 2013, 83 (3) 587-593; DOI: https://doi.org/10.1124/mol.112.082446
Lily I. Jiang
Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, Texas
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Jennifer E. Wang
Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, Texas
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Paul C. Sternweis
Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, Texas
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Abstract

Regulation of multiple adenylyl cyclases (AC) provides unique inputs to mediate the synthesis of cAMP, a ubiquitous second messenger that controls many aspects of cellular function. On stimulation by Gs, the activities of ACs can be further selectively modulated by other pathways to ensure precise control of intracellular cAMP responses to specific stimuli. Recently, we reported that one of the AC isoforms, AC7, is uniquely regulated by the G13 pathway. To understand more fully the molecular mechanism of this regulation, we compared the regulation of AC7 with that of AC2 in bone marrow–derived macrophages devoid of AC7. Although both enzymes could fully restore regulation of cAMP by Gβγ, activation of the G13 pathway preferentially synergized with AC7. Exchange of domains between the two isoforms indicates that the C1b domain and the N-terminus of the C1a domain are important for directing selective regulation of AC7 by the G13 pathway. A mutagenesis screen identified more specific regions of AC7 that differentially mediate its regulation by distinct pathways.

Footnotes

  • This work was supported by the National Institutes of Health National Institute of General Medical Sciences [Grant GM084098]; and the Alfred and Mabel Gilman Chair in Molecular Pharmacology (to P.C.S.).

  • dx.doi.org/10.1124/mol.112.082446.

  • ↵Embedded ImageThis article has supplemental material available at molpharm.aspetjournals.org.

  • Received September 14, 2012.
  • Accepted December 10, 2012.
  • Copyright © 2013 by The American Society for Pharmacology and Experimental Therapeutics
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Molecular Pharmacology: 83 (3)
Molecular Pharmacology
Vol. 83, Issue 3
1 Mar 2013
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Research ArticleArticle

Regulation of Adenylyl Cyclase VII by G13

Lily I. Jiang, Jennifer E. Wang and Paul C. Sternweis
Molecular Pharmacology March 1, 2013, 83 (3) 587-593; DOI: https://doi.org/10.1124/mol.112.082446

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Research ArticleArticle

Regulation of Adenylyl Cyclase VII by G13

Lily I. Jiang, Jennifer E. Wang and Paul C. Sternweis
Molecular Pharmacology March 1, 2013, 83 (3) 587-593; DOI: https://doi.org/10.1124/mol.112.082446
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