6jmk | pdb_00006jmk
Ribosomal protein S7 from Mycobacterium tuberculosis
Structural highlights
Function[RS7_MYCTU] One of the primary rRNA binding proteins, it binds directly to 16S rRNA where it nucleates assembly of the head domain of the 30S subunit. Is located at the subunit interface close to the decoding center, probably blocks exit of the E-site tRNA. Publication Abstract from PubMedTuberculosis, caused by Mycobacterium tuberculosis (Mtb), has threaten human health for thousands years. The chaperone trigger factor (TF) of Mtb (mtbTF), a ribosome-associated molecule, plays important roles in co-translational nascent chain folding and post-translational protein assembly. However, due to lack of structural information, the dynamic regulatory mechanism of mtbTF remains barely investigated. Herein we report the structural basis of the complex of TF and ribosomal protein S7 (mtbS7) from Mtb. The mtbTF-mtbS7 complex was obtained with high purity and homogeneity in vitro. MtbTF bound with mtbS7 in a Kd value of 1.433muM, and formed a complex with mtbS7 at 1:2M ratios as shown by isothermal titration calorimetry. In addition, the crystal structure of mtbS7 was solved to a resolution at 1.8A, which was composed of six alpha-helices and two beta-strands. Moreover, the molecular envelopes of mtbTF and mtbTF-mtbS7 complex were built and consisted with these homologous structures by small-angle X-ray scattering method. Our current findings might provide structural basis for understanding the molecular mechanism of TF in protein folding and the regulation of ribosomal assembly in Mtb. Structural insights into the complex of trigger factor chaperone and ribosomal protein S7 from Mycobacterium tuberculosis.,Li Z, Wu D, Zhan B, Hu X, Gan J, Ji C, Li J Biochem Biophys Res Commun. 2019 May 14;512(4):838-844. doi:, 10.1016/j.bbrc.2019.03.166. Epub 2019 Mar 28. PMID:30928093[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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