HIS 92 R93 GLY 7 STHR 9 SER 8 ASP 76 ASN 9 S 6 The above centrally-placed water molecule makes strong hydrogen bonds to residues in three separated parts of the ribonuclease(核糖核酸酶) molecule holding them together This water molecule and its binding site are conserved across the entire family of microbial ribonucleasesThe above centrally-placed water molecule makes strong hydrogen bonds to residues in three separated parts of the ribonuclease(核糖核酸酶) molecule holding them together. This water molecule and its binding site are conserved across the entire family of microbial ribonucleases