KHA is the tetramerisation domain of eukaryotic voltage-dependent potassium ion-channel proteins. In plants the domain lies at the C-terminus whereas in many chordates it lies at the N-terminus.

1: Multiple genes, tissue specificity, and expression-dependent modulationcontribute to the functional diversity of potassium channels in Arabidopsis thaliana. Cao Y, Ward JM, Kelly WB, Ichida AM, Gaber RF, Anderson JA, Uozumi N, Schroeder JI, Crawford NM; Plant Physiol. 1995;109:1093-1106. PMID:8552711

2: Tetramerization of the AKT1 plant potassium channel involves its C-terminal cytoplasmic domain. Daram P, Urbach S, Gaymard F, Sentenac H, Cherel I; EMBO J. 1997;16:3455-3463. PMID:9218788

3: The K+ channel SKT1 is co-expressed with KST1 in potato guard cells--both channels can co-assemble via their conserved KT domains. Zimmermann S, Hartje S, Ehrhardt T, Plesch G, Mueller-Roeber B; Plant J. 2001;28:517-527. PMID:11849592