2K72

Solution NMR structure of toxin-like potassium channel blocking domain in MMP23


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Potassium channel modulation by a toxin domain in matrix metalloprotease 23.

Rangaraju, S.Khoo, K.K.Feng, Z.P.Crossley, G.Nugent, D.Khaytin, I.Chi, V.Pham, C.Calabresi, P.Pennington, M.W.Norton, R.S.Chandy, K.G.

(2010) J.Biol.Chem. 285: 9124-9136

  • DOI: 10.1074/jbc.M109.071266

  • PubMed Abstract: 
  • Peptide toxins found in a wide array of venoms block K(+) channels, causing profound physiological and pathological effects. Here we describe the first functional K(+) channel-blocking toxin domain in a mammalian protein. MMP23 (matrix metalloproteas ...

    Peptide toxins found in a wide array of venoms block K(+) channels, causing profound physiological and pathological effects. Here we describe the first functional K(+) channel-blocking toxin domain in a mammalian protein. MMP23 (matrix metalloprotease 23) contains a domain (MMP23(TxD)) that is evolutionarily related to peptide toxins from sea anemones. MMP23(TxD) shows close structural similarity to the sea anemone toxins BgK and ShK. Moreover, this domain blocks K(+) channels in the nanomolar to low micromolar range (Kv1.6 > Kv1.3 > Kv1.1 = Kv3.2 > Kv1.4, in decreasing order of potency) while sparing other K(+) channels (Kv1.2, Kv1.5, Kv1.7, and KCa3.1). Full-length MMP23 suppresses K(+) channels by co-localizing with and trapping MMP23(TxD)-sensitive channels in the ER. Our results provide clues to the structure and function of the vast family of proteins that contain domains related to sea anemone toxins. Evolutionary pressure to maintain a channel-modulatory function may contribute to the conservation of this domain throughout the plant and animal kingdoms.


    Organizational Affiliation

    Department of Physiology and Biophysics, University of California, Irvine, California 92697, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Matrix metalloproteinase-23
A
37Rattus norvegicusGene Names: Mmp23 (Mifr)
EC: 3.4.24.-
Find proteins for O88272 (Rattus norvegicus)
Go to UniProtKB:  O88272
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 2K72 Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-01-05
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance