2MD0

Solution structure of ShK-like immunomodulatory peptide from Ancylostoma caninum (hookworm)


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 1.1 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:  

  • 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 ...

    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 IFN╬│ 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

    Medicinal Chemistry, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Victoria, Australia;




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
AcK1
A
51Ancylostoma ceylanicumMutation(s): 0 
Gene Names: Acey_s0033.g2694
Find proteins for A0A016UNP9 (Ancylostoma ceylanicum)
Go to UniProtKB:  A0A016UNP9
Experimental Data & Validation

Experimental Data

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

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-07-02
    Type: Initial release
  • Version 1.1: 2015-04-08
    Type: Database references