Words similar to non-hydrolyzable
Example sentences for: non-hydrolyzable
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The middle histidine of the histidine triad (His96 in human Fhit), which is critical for hydrolysis of ApppA by Fhit [ 14 16 ] , is not necessary for tumor suppression [ 17 18 ] . Nonetheless, wild-type and His96Asn forms of Fhit are saturated by ApppA in the low micromolar range and form stable complexes with non-hydrolyzable ApppA in which two ApppA analogs are bound per Fhit dimer and all phosphates cluster on one surface of the protein [ 16 ] . These observations suggested that Fhit-substrate complexes may be the active, signaling form of Fhit and that the function of the catalytically essential histidine may be to terminate the lifetime of signaling complexes [ 16 ] .
The initial step of the insertion can proceed in the presence of either Mg.ATP or a non-hydrolyzable ATP-analog and involves oligomerization of the BchD and BchI subunits to form an oligomeric ring of AAA protomers that resembles the ring structure of NSF and other AAA proteins [ 14 32 ] . The second step of the insertion involves an obligatory hydrolysis of ATP that is tightly coupled with the transfer of the chelated Mg 2+to the protoporphyrin ring by BchH [ 49 ] . Although the details differ from midasin, particularly with respect to the subunit composition of the AAA ring, this chelation reaction provides a structural model suggesting that the function of the midasin M-domain may be to regulate the ATPase activity of the AAA protomers in the pseudo-hexameric ring and thus couple ATP hydrolysis to the binding of a protein ligand at the MIDAS site.
A single EPR feature, species T, was observed when ADPNP (a non-hydrolyzable analog of ATP) complexed with VO 2+was bound to sCD39, which is consistent with the presence of only one nucleotide binding site [ 25 ] . The g and A tensors derived from species T are 1.9410 and 504.
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