|
Table 1.
GltpH residues identified in our
computations to play a functional role and their EAAT1 counterparts |
|||
|
Gltph residue |
Structural element |
Role inferred from MD (rows 9-10) and ENM (rows 11-12) |
EAAT1 counterpart |
|
G354, G357 |
HP2 |
Glu recognition, loop flexibility |
G442, Q445 |
|
S277-S279 |
HP1 |
Glu binding (3-Ser motif) |
S364-S366 |
|
D312-T314 |
TM7 |
Glu coordination (NMDGT motif) |
D400-T402 |
|
R397-T398 |
TM8 |
Stabilization of bound glutamate |
R479-T480 |
|
T314 |
TM7 |
Water binding |
T402 |
|
N401, V400 |
TM8 |
N483, T482 |
|
|
D390, D394 |
TM8 |
Pathway for water and Na+ ions entry/exit and Glu stabilization |
D472, D476 |
|
N310, A307, D312 |
TM7 |
Na+ binding site
I |
N398, A395 D400 |
|
N401, G404 |
TM8 |
N483, G486 |
|
|
L303, G306 |
TM7 |
Na+
binding site II |
L391,G394 |
|
D405 |
TM8 |
D487 |
|
|
M286 |
HP1 |
Blockers on exit pathway – (delivery to the IC region) |
F373 |
|
L303 |
TM7 |
L391 |
|
|
G144 |
TM4 |
Hinge center for global opening/closing of the trimer |
E184 |
|
L183 |
TM5 |
R268 |
|
|
H114 H332 |
L34 TM7/8 loop |
Potential sites for capture of anions from the EC region |
K152 E420 |
Residues implicated in recognition and binding of glutamate, water or Na+ ions, as seen in the simulation analysis. The equivalent residues in EAAT1 are given in the fourth column. Residues highlighted in bold are those which are highly conserved, bold & underlined are those which are both conserved and implicated in the function of transport and/or binding.