2MCR

Solution structure of ShK-like immunomodulatory peptide from Brugia malayi (filarial worm)


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 30 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Kv1.3 channel-blocking immunomodulatory peptides from parasitic worms: implications for autoimmune diseases.

Chhabra, S.Chang, S.C.Nguyen, H.M.Huq, R.Tanner, M.R.Londono, L.M.Estrada, R.Dhawan, V.Chauhan, S.Upadhyay, S.K.Gindin, M.Hotez, P.J.Valenzuela, J.G.Mohanty, B.Swarbrick, J.D.Wulff, H.Iadonato, S.P.Gutman, G.A.Beeton, C.Pennington, M.W.Norton, R.S.Chandy, K.G.

(2014) FASEB J 28: 3952-3964

  • DOI: 10.1096/fj.14-251967
  • Primary Citation of Related Structures:  
    2MCR, 2MD0

  • PubMed Abstract: 
  • The voltage-gated potassium (Kv) 1.3 channel is widely regarded as a therapeutic target for immunomodulation in autoimmune diseases. ShK-186, a selective inhibitor of Kv1.3 channels, ameliorates autoimmune diseases in rodent models, and human phase 1 trials of this agent in healthy volunteers have been completed ...

    The voltage-gated potassium (Kv) 1.3 channel is widely regarded as a therapeutic target for immunomodulation in autoimmune diseases. ShK-186, a selective inhibitor of Kv1.3 channels, ameliorates autoimmune diseases in rodent models, and human phase 1 trials of this agent in healthy volunteers have been completed. In this study, we identified and characterized a large family of Stichodactyla helianthus toxin (ShK)-related peptides in parasitic worms. Based on phylogenetic analysis, 2 worm peptides were selected for study: AcK1, a 51-residue peptide expressed in the anterior secretory glands of the dog-infecting hookworm Ancylostoma caninum and the human-infecting hookworm Ancylostoma ceylanicum, and BmK1, the C-terminal domain of a metalloprotease from the filarial worm Brugia malayi. These peptides in solution adopt helical structures closely resembling that of ShK. At doses in the nanomolar-micromolar range, they block native Kv1.3 in human T cells and cloned Kv1.3 stably expressed in L929 mouse fibroblasts. They preferentially suppress the proliferation of rat CCR7(-) effector memory T cells without affecting naive and central memory subsets and inhibit the delayed-type hypersensitivity (DTH) response caused by skin-homing effector memory T cells in rats. Further, they suppress IFNγ production by human T lymphocytes. ShK-related peptides in parasitic worms may contribute to the potential beneficial effects of probiotic parasitic worm therapy in human autoimmune diseases.


    Organizational Affiliation

    Department of Physiology and Biophysics, School of Medicine, University of California, Irvine, California, USA; gchandy@uci.edu ray.norton@monash.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Probable zinc metalloproteinase, putativeA37Brugia malayiMutation(s): 1 
Gene Names: bma-nas-14Bma-nas-14Bm3230BM_Bm3230
EC: 3.4.24
UniProt
Find proteins for A0A0J9XQE3 (Brugia malayi)
Explore A0A0J9XQE3 
Go to UniProtKB:  A0A0J9XQE3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A0J9XQE3
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 30 
  • Selection Criteria: structures with the lowest energy 
  • OLDERADO: 2MCR Olderado

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-07-02
    Type: Initial release
  • Version 1.1: 2015-04-08
    Changes: Database references
  • Version 1.2: 2016-04-27
    Changes: Structure summary