1UYA

THE SOLUTION STRUCTURE OF THE A-FORM OF UROGUANYLIN-16 NMR, 10 STRUCTURES


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 30 
  • Conformers Submitted: 10 
  • Selection Criteria: ENERGY, AGREEMENT WITH EXPERIMENTAL DATA 

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This is version 1.3 of the entry. See complete history


Literature

One peptide, two topologies: structure and interconversion dynamics of human uroguanylin isomers.

Marx, U.C.Klodt, J.Meyer, M.Gerlach, H.Rosch, P.Forssmann, W.G.Adermann, K.

(1998) J Pept Res 52: 229-240

  • DOI: 10.1111/j.1399-3011.1998.tb01480.x
  • Primary Citation of Related Structures:  
    1UYA, 1UYB

  • PubMed Abstract: 
  • The peptide hormone uroguanylin stimulates chloride secretion via activation of intestinal guanylyl cyclase C (GC-C). It is characterized by two disulfide bonds in a 1-3/2-4 pattern that causes the existence of two topological stereoisomers of which only one induces intracellular cGMP elevation ...

    The peptide hormone uroguanylin stimulates chloride secretion via activation of intestinal guanylyl cyclase C (GC-C). It is characterized by two disulfide bonds in a 1-3/2-4 pattern that causes the existence of two topological stereoisomers of which only one induces intracellular cGMP elevation. To obtain an unambiguous structure-function relationship of the isomers, we determined the solution structure of the separated uroguanylin isoforms using NMR spectroscopy. Both isomers adopt well-defined structures that correspond to those of the isomers of the related peptide guanylin. Furthermore, the structure of the GC-C-activating uroguanylin isomer A closely resembles the structure of the agonistic Escherichia coli heat-stable enterotoxin. Compared with guanylin isomers, the conformational interconversion of uroguanylin isomers is retarded significantly. As judged from chromatography and NMR spectroscopy, both uroguanylin isoforms are stable at low temperatures, but are subject to a slow pH-dependent mutual isomerization at 37 degrees C with an equilibrium isomer ratio of approximately 1:1. The conformational exchange is most likely under the sterical control of the carboxy-terminal leucine. These results imply that GC-C is activated by ligands exhibiting the molecular framework corresponding to the structure of uroguanylin isomer A.


    Organizational Affiliation

    Niedersächsisches Institut für Peptid-Forschung, Hannover, Germany.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
UROGUANYLIN-16, ISOMER AA16Homo sapiensMutation(s): 0 
Gene Names: GUCA2B
UniProt & NIH Common Fund Data Resources
Find proteins for Q16661 (Homo sapiens)
Explore Q16661 
Go to UniProtKB:  Q16661
PHAROS:  Q16661
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ16661
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 30 
  • Conformers Submitted: 10 
  • Selection Criteria: ENERGY, AGREEMENT WITH EXPERIMENTAL DATA 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1998-03-18
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2022-03-02
    Changes: Database references, Derived calculations, Other