Phosphate-binding loop and Rab GTPase function: mutations at Ser29 and Ala30 of Rab5 lead to loss-of-function as well as gain-of-function phenotype.

Abstract excerpt

Ras-like GTPases contain a structurally conserved GTP-binding domain. An important element of the GTP-binding domain is the phosphate-binding loop, which contains two Gly residues (Gly(12) and Gly(13)) in Ras. Because the two Gly residues are crucial for normal Ras function, it is intriguing that they are not conserved in other Ras-like GTPases, including the Rab GTPases; for example, the equivalent residues in...

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