2ZCD CRYSTAL STRUCTURE OF THE CATALYTIC DOMAIN OF PYRROLYSYL- TRNA SYNTHETASE IN COMPLEX WITH AMPPNP LIGASE, AMINOACYL-TRNA SYNTHETASE, PYRROLYSYL-TRNA SYNTHETASE, TRNA, ATP ANALOGUE, PROTEIN3000, ATP-BINDING, CYTOPLASM, NUCLEOTIDE-BINDING, PROTEIN BIOSYNTHESIS, STRUCTURAL GENOMICS, NPPSFA, NATIONAL PROJECT ON PROTEIN STRUCTURAL AND FUNCTIONAL ANALYSES, RIKEN STRUCTURAL GENOMICS/PROTEOMICS INITIATIVE, RSGI