ESCHERICHIA COLI GLUTAMINE PHOSPHORIBOSYLPYROPHOSPHATE (PRPP) AMIDOTRANSFERASE

PIPERAZINE-N,N'-BIS(2-ETHANESULFONIC ACID)
PIPES; 1,4-PIPERAZINEDIETHANESULFONIC ACID

Crystal structure of glutamine phosphoribosylpyrophosphate amidotransferase from Escherichia coli.

GLUTAMINE PHOSPHORIBOSYLPYROPHOSPHATE AMIDOTRANSFERASE

CGIVGIAGVMPVNQSIYDALTVLQHRGQDAAGIITIDANNCFRLRKANGLVSDVFEARHMQRLQGNMGIGHVRYPTAGSS
SASEAQPFYVNSPYGITLAHNGNLTNAHELRKKLFEEKRRHINTTSDSEILLNIFASELDNFRHYPLEADNIFAAIAATN
RLIRGAYACVAMIIGHGMVAFRDPNGIRPLVLGKRDIDENRTEYMVASESVALDTLGFDFLRDVAPGEAIYITEEGQLFT
RQCADNPVSNPCLFEYVYFARPDSFIDKISVYSARVNMGTKLGEKIAREWEDLDIDVVIPIPETSCDIALEIARILGKPY
RQGFVKNRYVGRTFIMPGQQLRRKSVRRKLNANRAEFRDKNVLLVDDSIVRGTTSEQIIEMAREAGAKKVYLASAAPEIR
FPNVYGIDMPSATELIAHGREVDEIRQIIGADGLIFQDLNDLIDAVRAENPDIQQFECSVFNGVYVTKDVDQGYLDFLDT
LRNDDAKAVQRQNEVENLEMHNEG

ORIGINAL MOLECULAR REPLACEMENT SOLUTION WAS OBTAINED IN A DIFFERENT CRYSTAL FORM.

GLU A 303 AND GLU B 303 ARE CIS-GLUTAMINE - PART OF A PHOSPHATE BINDING SITE INVOLVED IN BINDING BOTH SUBSTRATE AND INHIBITORS.

TYR 94 IN EACH CHAIN HAS PHI/PSI VALUES THAT ARE NORMALLY DISALLOWED. IT FORMS A SHARP BETA-TURN WITH PRO 93, A CIS-PROLINE.

THE DISTANCE BETWEEN X982 AND X230 IS ARTIFICIALLY SHORT DUE TO UNMODELLED HETEROGENEITY AT A SPECIAL POSITION NEAR X230.

ADDITIONAL UNMODELED ELECTRON DENSITY IS PRESENT NEAR THE CYS 1 SULFUR. IT APPEARS TO REPRESENT A HETEROGENEOUS OXIDATION BY OXYGEN AND SULFUR COMPOUNDS.

MOLECULAR REPLACEMENT AND SIR PHASES FROM SEMET PROTEIN

PHE B 88 - SER B 92 EXISTS IN TWO DISTINCT CONFORMATIONS AS A RESULT OF THE BINDING OF PIPES BUFFER ALONG THE CRYSTALLOGRAPHIC MOLECULAR TWO-FOLD AXIS, AND IS THEREFORE POORLY DEFINED. APPLICATION OF THE CRYSTALLOGRAPHIC SYMMETRY OPERATOR TO THE SECOND SET OF RESIDUES WILL GENERATE A COMPLETE ASYMMETRIC MODEL OF THIS SITE.

TRANSFERASE (GLUTAMINE AMIDOTRANSFERASE)
PURINE BIOSYNTHESIS, TRANSFERASE, GLYCOSYLTRANSFERASE, GLUTAMINE AMIDOTRANSFERASE, TRANSFERASE (GLUTAMINE AMIDOTRANSFERASE)

NTN TYPE GLUTAMINE AMIDOTRANSFERASE CATALYTIC RESIDUE. THIS SITE BELONGS TO THE NTN SUPERFAMILY, WHICH ARE THOUGHT TO UTILIZE THE ALPHA-AMINO GROUP OF THE N-TERMINAL RESIDUE AS A PROTON DONOR , AND THE SIDE CHAIN OF THIS RESIDUE AS A NUCLEOPHILE IN CATALYSIS OF A HYDROLYTIC REACTION.

PRPP BINDING MOTIF, IDENTIFIED BY SEQUENCE SIMILARITY AMONG MEMBERS OF THE PHOSPHORIBOSYLTRANSFERASE (PRTASE) FAMILY OF ENZYMES.