1QAW

Regulatory Features of the TRP Operon and the Crystal Structure of the TRP RNA-Binding Attenuation Protein from Bacillus Stearothermophilus.

Summary for 1QAW

• Entry DOI: 10.2210/pdb1qaw/pdb
• Descriptor: TRP RNA-BINDING ATTENUATION PROTEIN, TRYPTOPHAN (3 entities in total)
• Functional Keywords: circular assembly, 11-fold symmetry, rna-binding protein, rna binding protein
• Biological source: Geobacillus stearothermophilus
• Total number of polymer chains: 11
• Total formula weight: 93077.62

Authors

Chen, X.-P.,Antson, A.A.,Yang, M.,Baumann, C.,Dodson, E.J.,Dodson, G.G.,Gollnick, P. (deposition date: 1999-03-31, release date: 1999-04-16, Last modification date: 2024-02-14)

Primary citation

Chen, X.,Antson, A.A.,Yang, M.,Li, P.,Baumann, C.,Dodson, E.J.,Dodson, G.G.,Gollnick, P.
Regulatory features of the trp operon and the crystal structure of the trp RNA-binding attenuation protein from Bacillus stearothermophilus.
J.Mol.Biol., 289:1003-1016, 1999

PubMed Abstract: Characterization of both the cis and trans -acting regulatory elements indicates that the Bacillus stearothermophilustrp operon is regulated by an attenuation mechanism similar to that which controls the trp operon in Bacillus subtilis. Secondary structure predictions indicate that the leader region of the trp mRNA is capable of folding into terminator and anti- terminator RNA structures. B. stearothermophilus also encodes an RNA-binding protein with 77% sequence identity with the RNA-binding protein (TRAP) that regulates attenuation in B. subtilis. The X-ray structure of this protein has been determined in complex with L-tryptophan at 2.5 A resolution. Like the B. subtilis protein, B. stearothermophilus TRAP has 11 subunits arranged in a ring-like structure. The central cavities in these two structures have different sizes and opposite charge distributions, and packing within the B. stearothermophilus TRAP crystal form does not generate the head-to-head dimers seen in the B. subtilis protein, suggesting that neither of these properties is functionally important. However, the mode of L-tryptophan binding and the proposed RNA binding surfaces are similar, indicating that both proteins are activated by l -tryptophan and bind RNA in essentially the same way. As expected, the TRAP:RNA complex from B. stearothermophilus is significantly more thermostable than that from B. subtilis, with optimal binding occurring at 70 degrees C.

PubMed: 10369778
DOI: 10.1006/jmbi.1999.2834

Experimental method

X-RAY DIFFRACTION (2.5 Å)