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8.B.19.2.1
U1-ctenitoxin Cs1a (CstX-7).  Blocks mammalian neuronal L-type (Cav1/CACNA1) high-voltage-activated calcium channels.  Causes paralysis in Drosophila. Its insecticidal activity is synergistically increased by potassium ions, M-ctenitoxin-Cs1a (P83619), omega-ctenitoxin-Cs1a (P81694), and U1-ctenitoxin-Cs2a (P83919).  Because of the disulfide knot strcuture, this neurotoxin is called a knottin (Schalle et al. 2001).

Accession Number:P58604
Protein Name:U1-ctenitoxin-Cs1a
Length:68
Molecular Weight:7539.00
Species:Cupiennius salei (Wandering spider) [6928]
Location1 / Topology2 / Orientation3: Secreted1
Substrate NONE

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FASTA formatted sequence
1:	KDDKNCIPKH HECTNDKKNC CKKGLTKMKC KCFTVADAKG ATSERCACDS SLLQKFGFTG 
61:	LHIIKGLF