1bwd
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INOSAMINE-PHOSPHATE AMIDINOTRANSFERASE STRB1 FROM STREPTOMYCES GRISEUS
OverviewOverview
Inosamine-phosphate amidinotransferases catalyze two nonconsecutive, transamidination reactions in the biosynthesis of the streptomycin family, of antibiotics. L-Arginine:inosamine-phosphate amidinotransferase StrB1, from Streptomyces griseus (StrB1) was cloned as an N-terminal, hexa-histidine fusion protein, purified by affinity chromatography, and, crystallized, and its crystal structure was solved by Patterson search, methods at 3.1 A resolution. The structure is composed of five betabeta, alphabeta-modules which are arranged circularly into a pseudo-5-fold, symmetric particle. The three-dimensional structure is closely related to, the structure of human L-arginine:glycine amidinotransferase (AT), but, five loops (the 40-, 170-, 220-, 250-, and 270-loop) are organized very, differently. The major changes are found in loops around the active site, which open the narrow active site channel of AT to form an open and, solvent-exposed cavity. In particular, module II of StrB1 is AT-like but, lacks a 10-residue alpha-helix in the 170-loop. The concomitant, reorganization of neighboring surface loops that surround the active site, i.e., the 40-loop and the 270-loop, results in an arrangement of loops, which allows an unrestricted access of substrates to the cavity. However, the residues which are involved in substrate binding and catalysis are, conserved in AT and StrB1 and are at equivalent topological positions, suggesting a similar reaction mechanism among amidinotransferases. The, binding site for L-arginine had been deduced from its complex with AT., Molecular modeling revealed a possible binding mode for the second, substrate scyllo-inosamine 4-phosphate.
About this StructureAbout this Structure
1BWD is a Single protein structure of sequence from Streptomyces chryseus. Active as Scyllo-inosamine-4-phosphate amidinotransferase, with EC number 2.1.4.2 Full crystallographic information is available from OCA.
ReferenceReference
Crystal structure of L-arginine:inosamine-phosphate amidinotransferase StrB1 from Streptomyces griseus: an enzyme involved in streptomycin biosynthesis., Fritsche E, Bergner A, Humm A, Piepersberg W, Huber R, Biochemistry. 1998 Dec 22;37(51):17664-72. PMID:9922132
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