OBSOLETE. Catalysis of the reaction: GTP + H2O = GDP + phosphate.

A molecular function regulator that cycles between active GTP-bound and inactive GDP-bound states. In its active state, binds to a variety of effector proteins to regulate cellular processes. Intrinsic GTPase activity returns the G protein to its GDP-bound state. The return to the GDP-bound state can be accelerated by the action of a GTPase-activating protein (GAP).

Catalysis of the formation of the linkage between a protein and a glycosylphosphatidylinositol anchor. The reaction probably occurs by subjecting a peptide bond to nucleophilic attack by the amino group of ethanolamine-GPI, transferring the protein from a signal peptide to the GPI anchor.

Catalysis of the reaction: ATP + XMP + L-glutamine + H2O = AMP + diphosphate + GMP + L-glutamate + 2H(+).

Catalysis of the reaction: (2E,4Z,7E)-2-hydroxy-6-oxonona-2,4,7-trienedioate + H2O = (2E)-2-hydroxypenta-2,4-dienoate + fumarate + H+.

Catalysis of the reaction: ATP + XMP + NH4(+) = AMP + diphosphate + GMP + 2H(+).

Catalysis of the reaction: DNA containing 3-methylguanine + H2O = DNA with abasic site + 3-methylguanine. This reaction is the hydrolysis of DNA by cleavage of the N-C1' glycosidic bond between the damaged DNA 3-methylguanine and the deoxyribose sugar to remove the 3-methylguanine, leaving an abasic site.

Catalysis of the reaction: IMP + NADP(+) + NH(4)(+) = GMP + 2 H(+) + NADPH.

Catalysis of the reaction: inositol-1,3,4,5,6-pentakisphosphate + H2O = inositol-3,4,5,6-tetrakisphosphate + phosphate.

Catalysis of the reaction: DNA containing 7-methyladenine + H2O = DNA with abasic site + 7-methyladenine. This reaction is the hydrolysis of DNA by cleavage of the N-C1' glycosidic bond between the damaged DNA 7-methyladenine and the deoxyribose sugar to remove the 7-methyladenine, leaving an abasic site.

Catalysis of the reaction: DNA with 1-N6-ethenoadenine + H2O = DNA with abasic site + 1-N6-ethenoadenine. This reaction is the removal of 1,N6-ethenoadenine by cleaving the N-C1' glycosidic bond between the target damaged DNA base and the deoxyribose sugar.

Catalysis of the reaction: myo-inositol hexakisphosphate + H2O = myo-inositol 1,3,4,5,6-pentakisphosphate + phosphate.

Catalysis of the reaction: D-myo-inositol 1,3,4-trisphosphate + H2O = myo-inositol 3,4-bisphosphate + phosphate.

OBSOLETE. Any process that activates or increases the frequency, rate or extent of BMP signaling pathway involved in spinal cord association neuron specification.

Catalysis of the reaction: 1D-myo-inositol 3,4-bisphosphate + H2O = 1D-myo-inositol 3-phosphate + phosphate.

OBSOLETE. Any process that stops, prevents or reduces the frequency, rate or extent of proteasome-activating ATPase activity.

OBSOLETE. Any process that modulates the frequency, rate or extent of proteasome-activating ATPase activity.