Pulsed electron spin resonance resolves the coordination site of Cu²(+) ions in α1-glycine receptor.

Abstract:

:Herein, we identify the coordination environment of Cu²(+) in the human α1-glycine receptor (GlyR). GlyRs are members of the pentameric ligand-gated ion channel superfamily (pLGIC) that mediate fast signaling at synapses. Metal ions like Zn²(+) and Cu²(+) significantly modulate the activity of pLGICs, and metal ion coordination is essential for proper physiological postsynaptic inhibition by GlyR in vivo. Zn²(+) can either potentiate or inhibit GlyR activity depending on its concentration, while Cu²(+) is inhibitory. To better understand the molecular basis of the inhibitory effect we have used electron spin resonance to directly examine Cu²(+) coordination and stoichiometry. We show that Cu²(+) has one binding site per α1 subunit, and that five Cu²(+) can be coordinated per GlyR. Cu²(+) binds to E192 and H215 in each subunit of GlyR with a 40 μM apparent dissociation constant, consistent with earlier functional measurements. However, the coordination site does not include several residues of the agonist/antagonist binding site that were previously suggested to have roles in Cu²(+) coordination by functional measurements. Intriguingly, the E192/H215 site has been proposed as the potentiating Zn²(+) site. The opposing modulatory actions of these cations at a shared binding site highlight the sensitive allosteric nature of GlyR.

journal_name

Biophys J

journal_title

Biophysical journal

authors

Ruthstein S,Stone KM,Cunningham TF,Ji M,Cascio M,Saxena S

doi

10.1016/j.bpj.2010.08.050

subject

Has Abstract

pub_date

2010-10-20 00:00:00

pages

2497-506

issue

8

eissn

0006-3495

issn

1542-0086

pii

S0006-3495(10)01046-5

journal_volume

99

pub_type

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