CRYSTAL STRUCTURE OF CATALYTIC FRAGMENT OF E. COLI ALARS G237A IN COMPLEX WITH SERSA 3HY1 LIGASE, AMINOACYL-TRNA SYNTHETASE, PROTEIN BIOSYNTHESIS, NUCLEOTIDE-BINDING, AMINO ACID-BINDING, ACETYLATION, ATP- BINDING, CYTOPLASM, METAL-BINDING, ZINC, ZINC-FINGER