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1cx4

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{{STRUCTURE_1cx4| PDB=1cx4 | SCENE= }}
{{STRUCTURE_1cx4| PDB=1cx4 | SCENE= }}
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'''CRYSTAL STRUCTURE OF A DELETION MUTANT OF THE TYPE II BETA REGULATORY SUBUNIT OF CAMP-DEPENDENT PROTEIN KINASE'''
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===CRYSTAL STRUCTURE OF A DELETION MUTANT OF THE TYPE II BETA REGULATORY SUBUNIT OF CAMP-DEPENDENT PROTEIN KINASE===
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==Overview==
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BACKGROUND: Cyclic AMP binding domains possess common structural features yet are diversely coupled to different signaling modules. Each cAMP binding domain receives and transmits a cAMP signal; however, the signaling networks differ even within the same family of regulatory proteins as evidenced by the long-standing biochemical and physiological differences between type I and type II regulatory subunits of cAMP-dependent protein kinase. RESULTS: We report the first type II regulatory subunit crystal structure, which we determined to 2.45 A resolution and refined to an R factor of 0.176 with a free R factor of 0.198. This new structure of the type II beta regulatory subunit of cAMP-dependent protein kinase demonstrates that the relative orientations of the two tandem cAMP binding domains are very different in the type II beta as compared to the type I alpha regulatory subunit. Each structural unit for binding cAMP contains the highly conserved phosphate binding cassette that can be considered the "signature" motif of cAMP binding domains. This motif is coupled to nonconserved regions that link the cAMP signal to diverse structural and functional modules. CONCLUSIONS: Both the diversity and similarity of cAMP binding sites are demonstrated by this new type II regulatory subunit structure. The structure represents an intramolecular paradigm for the cooperative triad that links two cAMP binding sites through a domain interface to the catalytic subunit of cAMP-dependent protein kinase. The domain interface surface is created by the binding of only one cAMP molecule and is enabled by amino acid sequence variability within the peptide chain that tethers the two domains together.
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(as it appears on PubMed at http://www.pubmed.gov), where 11342137 is the PubMed ID number.
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{{ABSTRACT_PUBMED_11342137}}
==About this Structure==
==About this Structure==
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[[Category: Regulatory subunit]]
[[Category: Regulatory subunit]]
[[Category: Signaling protein]]
[[Category: Signaling protein]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 21:41:12 2008''

Revision as of 18:41, 30 June 2008

Image:1cx4.png

Template:STRUCTURE 1cx4

CRYSTAL STRUCTURE OF A DELETION MUTANT OF THE TYPE II BETA REGULATORY SUBUNIT OF CAMP-DEPENDENT PROTEIN KINASE

Template:ABSTRACT PUBMED 11342137

About this Structure

1CX4 is a Single protein structure of sequence from Rattus norvegicus. Full crystallographic information is available from OCA.

Reference

Molecular basis for regulatory subunit diversity in cAMP-dependent protein kinase: crystal structure of the type II beta regulatory subunit., Diller TC, Madhusudan, Xuong NH, Taylor SS, Structure. 2001 Jan 10;9(1):73-82. PMID:11342137

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