MOLECULAR DETERMINANTS OF CA2-TYPE CA2+ CHANNELS( SELECTIVITY AND IONPERMEATION IN L)

VOLTAGE-GATED Ca2+ channels link changes in membrane potential to the delivery of Ca2+, a key second messenger for many cellular responses1. Ca2+ channels show selectivity for Ca2+ over more plentiful ions such as Na+ or K+ by virtue of their high-affinity binding of Ca2+ within the pore2-6. It has been suggested that this binding involves four con served glutamate residues7-10 in equivalent positions in the putative pore-lining regions of repeats I-IV in the Ca2+ channel alpha1 subunit . We have carried out a systematic series of single amino-acid substit utions in each of these positions and find that all four glutamates pa rticipate in high-affinity binding of Ca2+ or Cd2+. Each glutamate car boxylate makes a distinct contribution to ion binding, with the carbox ylate in repeat III having the strongest effect. Some single glutamate -to-lysine mutations completely abolish micromolar Ca2+ block, indicat ing that the pore does not possess any high-affinity binding site that acts independently of the four glutamate residues. The prevailing mod el of Ca2+ permeation2,3 must thus be modified to allow binding of two Ca2+ ions in close proximity11,12, within the sphere of influence of the four glutamates. The functional inequality of the glutamates may b e advantageous in allowing simultaneous interactions with multiple Ca2 + ions moving single-file within the pore. Competition among Ca2+ ions for individual glutamates11,12, together With repulsive ion-ion elect rostatic interaction2,3, may help achieve rapid flux rates through the channel2-5.