Words similar to divalent
Example sentences for: divalent
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Closely spaced acidic residues that coordinate divalent cations are characteristic of the active sites of most nucleic acid polymerases, in spite of the fact that they belong to several unrelated structural folds [ 9 13 14 17 28 29 59 ] . Given that the DbDGD motif is the only set of closely spaced acidic residues shared by the RDRPs and the YRHs, it is likely to form part of the nucleotidyltransferase active site of these enzymes.
Analogous to the RecT superfamily, this acidic dyad might coordinate a divalent cation and undergo a conformational change dependent on metal-binding.
The catalytic activity of CD39 is dependent on the presence of divalent cations.
The presence of around 6 conserved acidic positions in the majority of the CYTH domains suggests that it coordinates two divalent metal ions.
Human Fhit [ 14 ] and the S. cerevisiae Fhit homolog [ 13 ] , which was called Aph1 but is here termed Hnt2 under nomenclature aproved by the Saccharomyces Genome Database, cleave ApppA more readily while Aph1, the S. pombe homolog, cleaves AppppA more readily [ 20 ] . Consistent with the ApppA hydrolase activity of purified Fhit protein, most cancer cell lines that are Fhit negative at the protein level have higher levels of ApppA than cell lines that are Fhit positive [ 21 ] . Nonetheless, the actual concentrations of dinucleoside polyphosphates were submicromolar in every cell culture sample [ 21 ] and thus, under the reported culture conditions, the measured dinucleoside polyphosphates would not be expected to occupy the Fhit active site substantially [ 19 ] . Dinucleoside polyphosphate levels were measured in adenine-requiring S. cerevisiae strains before or after disruption of the Fhit-homologous HNT2 gene [ 13 ] and in adenine-requiring S. pombe strains as a function of disruption and overexpression of the Fhit-homologous aph1 gene [ 22 ] . Recently, it was observed that diadenosine polyphosphates undergo a divalent cation-dependent conformational change that might mediate their biosynthesis, catabolism or signaling properties [ 23 ] .
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