1Q2K

Solution structure of BmBKTx1 a new potassium channel blocker from the Chinese Scorpion Buthus martensi Karsch


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 21 
  • 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

Solution Structure of BmBKTx1, a New BK(Ca)(1) Channel Blocker from the Chinese Scorpion Buthus martensi Karsch(,).

Cai, Z.Xu, C.Xu, Y.Lu, W.Chi, C.W.Shi, Y.Wu, J.

(2004) Biochemistry 43: 3764-3771

  • DOI: 10.1021/bi035412+

  • PubMed Abstract: 
  • BmBKTx1 is a 31-amino acid peptide identified from the venom of the Chinese scorpion Buthus martensi Karsch, blocking high-conductance calcium-activated potassium channels. Sequence homology analysis indicates that BmBKTx1 is a new subfamily of short ...

    BmBKTx1 is a 31-amino acid peptide identified from the venom of the Chinese scorpion Buthus martensi Karsch, blocking high-conductance calcium-activated potassium channels. Sequence homology analysis indicates that BmBKTx1 is a new subfamily of short-chain alpha-KTx toxins of the potassium channel, which we term alpha-KTx19. Synthetic BmBKTx1 was prepared by using solid-phase peptide synthesis. Two-dimensional NMR spectroscopy techniques were used to determine the solution structure of BmBKTx1. The results show that the BmBKTx1 forms a typical cysteine-stabilized alpha/beta scaffold adopted by most short-chain scorpion toxins. The structure of BmBKTx1 consists of a two-stranded antiparallel beta-sheet (residues 20-29) and an alpha-helix (residues 5-15). The three-dimensional structure of BmBKTx1 was also compared with those of two function-related scorpion toxins, charybdotoxin (ChTx) and BmTx1, and their structural and functional implications are discussed.


    Organizational Affiliation

    Laboratory of Structural Biology, School of Life Science, University of Science and Technology of China, Hefei, Anhui, PRC.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Neurotoxin BmK37
A
31Mesobuthus martensiiN/A
Find proteins for P83407 (Mesobuthus martensii)
Go to UniProtKB:  P83407
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 21 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 1Q2K Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-09-09
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance