1UYB

THE SOLUTION STRUCTURE OF THE B-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 

wwPDB Validation 3D Report Full Report


This is version 1.2 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

  • Primary Citation of Related Structures:  

  • 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 ...

    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

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
UROGUANYLIN-16, ISOMER B
A
16Homo sapiensMutation(s): 0 
Gene Names: GUCA2B
Find proteins for Q16661 (Homo sapiens)
Go to Gene View: GUCA2B
Go to UniProtKB:  Q16661
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 30 
  • Conformers Submitted: 10 
  • Selection Criteria: ENERGY, AGREEMENT WITH EXPERIMENTAL DATA 
  • Olderado: 1UYB Olderado
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1998-03-18
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance