Noun
oxyanion (plural oxyanions)
(chemistry) Any anion derived from an oxyacid
In addition, trypsin contains an "oxyanion hole" formed by the backbone amide hydrogen atoms of Gly-193 and Ser-195, which serves to stabilize the developing negative charge on the carbonyl oxygen atom of the cleaved amides. Source: Internet
In continue, aminic group (-NH3 + ) of the Ile16 residue interacts with the side chain of Glu194, producing the "oxyanion hole" and the hydrophobic "S1 pocket". Source: Internet
This occurs in the oxyanion hole. Source: Internet