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GTP binding site on a Ga protein, Gia1

GTP binding site on a Ga protein, Gia1
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Description: This figure shows bound GTPgS, a nonhydrolyzable GTP analog.

Stabilization of the phosphate negative charge by a conserved arginine (R178) facilitates hydrolysis of the bound nucleotide.

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Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=34887
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