title: Thermostable hexameric form of Eis (Rv2416c) protein of M. tuberculosis plays an important role for enhanced intracellular survival within macrophages.
abstract: Eis protein is reported to enhance the intracellular survival of Mycobacterium tuberculosis in human macrophages. Eis protein is not only known to skew away the immunity by disturbing the protective T(H)1 response, but aminoglycoside acetyltransferase activity of Eis is reported to regulate autophagy, inflammation and cell death. Here we have gained insight into the structure-function properties of Eis. Eis protein is a hexameric αβ protein. Although urea and guanidinium hydrochloride (GdmCl) was found to induce one-step unfolding of Eis but size exclusion chromatography showed that GdmCl treated Eis maintained its hexameric form. SDS-PAGE assay confirmed that hexameric form of Eis is partially stable to SDS and converts into trimers and monomers. Out of these three forms, aminoglycoside acetyltransferase activity is found to be associated only with hexamers. The Tm of Eis was found to be ∼75°C. Aminoglycoside acetyltransferase Eis demonstrated remarkable heat stability retaining >80% of their activity at 70°C which falls down to ∼50% at 75°C and is completely inactive at 80°C. Further, intracellular survival assay with heated samples of M. smegmatis harboring eis gene of M. tuberculosis H37Rv demonstrated a possible role for the thermostability associated with Eis protein in the enhanced intracellular survival within macrophages. In sum, these data reveal that only hexameric form of Eis has a thermostable aminoglycoside acetyltransferase activity. This is the first report showing the thermostability associated with aminoglycoside acetyltransferase activity of Eis protein being one of the essential features for the execution of its biological role.
authors: CSIR-Institute of Microbial Technology, Chandigarh, India.
authors: Arsheed A
authors: AA
authors: Ganaie
authors: Ravi K
authors: RK
authors: Lella
authors: Rahul
authors: R
authors: Solanki
authors: Charu
authors: C
authors: Sharma
mesh_terms: D000105:Acetyl Coenzyme A / Q000378:metabolism; D000123:Acetyltransferases / Q000378:metabolism; D000942:Antigens, Bacterial / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D001426:Bacterial Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D045744:Cell Line, Tumor; D019791:Guanidine / Q000494:pharmacology; D006801:Humans; D042541:Intracellular Space / Q000378:metabolism / Q000382:microbiology*; D008264:Macrophages / Q000382:microbiology*; D050296:Microbial Viability; D020102:Mycobacterium smegmatis / Q000235:genetics / Q000502:physiology; D009169:Mycobacterium tuberculosis / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D055503:Protein Multimerization / Q000187:drug effects; D055550:Protein Stability; D020836:Protein Structure, Quaternary / Q000187:drug effects; D058767:Protein Unfolding / Q000187:drug effects; D012967:Sodium Dodecyl Sulfate / Q000494:pharmacology; D013050:Spectrometry, Fluorescence; D013696:Temperature; D014508:Urea / Q000494:pharmacology
chemical_list: D000942:Antigens, Bacterial; D001426:Bacterial Proteins; D012967:Sodium Dodecyl Sulfate; D000105:Acetyl Coenzyme A; D014508:Urea; D000123:Acetyltransferases; C430563:Eis protein, Mycobacterium tuberculosis; C019681:aminoglycoside acetyltransferase; D019791:Guanidine