5xa6

Structural highlights

Function

DEF3_MESMA Antibacterial peptide active against Gram-positive bacteria (including S.aureus ATCC25923 (MIC=2.5 uM), M.luteus AB93113 (MIC=2.5 uM), and the antibiotic-resistant S.epidermidis PRSE P1389 (MIC=1.25 uM)), but not against Gram-negative bacteria (including E.coli and P.aeruginosa) (PubMed:31954123). Also blocks the currents of Kv1.1/KCNA1 (57% inhibition), Kv1.2/KCNA2 (27.5% inhibition), Kv1.3/KCNA3 (IC(50)=23.4 nM, 84.3% inhibition), KCa3.1/KCNN4/IK (15% inhibition), KCa2.3/KCNN3/SK3 (87.5% inhibition) and Kv11.1/KCNH2/ERG1 (30.4% inhibition) channels (tested at 1 uM) (PubMed:31954123). It inhibits potassium channel current by interacting with the pore region (PubMed:31954123).^[1]

References

1. ↑ Meng L, Zhao Y, Qu D, Xie Z, Guo X, Zhu Z, Chen Z, Zhang L, Li W, Cao Z, Tian C, Wu Y. Ion channel modulation by scorpion hemolymph and its defensin ingredients highlights origin of neurotoxins in telson formed in Paleozoic scorpions. Int J Biol Macromol. 2020 Apr 1;148:351-363. PMID:31954123 doi:10.1016/j.ijbiomac.2020.01.133