DFG Research Unit FOR 721/2
Molecular Structure and Function of the Tight Junction
  Project 6   

Gerd Krause, PhD    , Jörg Piontek, PhD   

Structural Bioinformatics & Protein Design, Leibniz Institute of Molecular Pharmacology (FMP), Berlin-Buch

 

Molecular and structural patterns of paracellular pores by subtype-dependent claudin-claudin interactions in tight junctions

The molecular and structural relation of the claudin-claudin interaction of the different claudin subtypes and their specific function (i.e. pore formation and/or tightness) in the tight junctions is still unsettled. We utilise disparities in pore formation and sequence differences of claudin subtypes in order to characterise molecular and structural patterns of paracellular interactions regarding pore formation and tightness. We combine methods of bioinformatics, molecular biology, mutation tests, and NMR structure tests.

Our starting hypotheses for sealing (structure sample No. I) and for pore-forming (structure sample No. II) of claudins are based mainly on electrostatic attraction and/or repulsion of intermolecular side chain interactions of the extracellular loops 1 (ECL1). Molecular determinants of pore-formation of the ECL1 will be investigated by use of locally arranged chimeric mutations, which are generated from homologous structure models of extracellular loop complexes.

Structural patterns of interacting ECL1 loops will be discovered by applying NMR methods on ECL1 constructs of pore-forming and non-pore-forming claudin subtypes and their complexes.

 

Granted by project 6

Publications 2010 -2012 (FOR 721/2)

 

2015

  • Conrad MP*, Piontek J* (*shared first authorship), Günzel D, Fromm M, Krug SM (2016, online 2015) Molecular basis of claudin-17 anion selectivity. Cell. Mol. Life Sci. 73(1): 185-200 (°IF 5.8) [PubMed] [WebPage] [PDF] [Supplement] TP1+TP6+TP7

2014

2013

2012

2011

2010

 Publications 2007 - 2009 (FOR 721/1)

Previous work