8rvj

Engineered Encapsulin P3P4

spinqualitylabelsall models 8rvj, resolution 3.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 8rvj is a 4 chain structure with sequence from Quasibacillus thermotolerans. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 3.1Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function ENCAP_BACTR Shell component of a type 1 encapsulin nanocompartment. Assembles into proteinaceous icosahedral shells 42-43 nm in diameter with an iron- and phosphorus-rich core (1Fe:1.1P) which can store over 23,000-35,000 iron atoms (with a calculated maximum of 83,000 Fe). There are 2 types of negatively charged open pores in the cryo-electron structure; a 3-fold pore where 3 hexamers meet with a minimal size of 7.2 Angstroms and a 5-fold pore where pentamers meet with a minimal size of 2.3 Angstroms. The 2-fold pore seen in other encapsulin nanocompartments is closed. Empty compartments can be generated in E.coli (PubMed:28263314, PubMed:31282860, PubMed:31194509). Both types of pore have extra density in their centers in the structure (PubMed:31282860). 2 different cargo proteins have been identified (IMEF and Fer); when both are expressed in E.coli with the shell protein only IMEF is detected within the nanocompartment. E.coli expressing all 3 genes stores the largest amount of iron and is protected from Fe/H2O2-induced oxidative stress (PubMed:28263314). Part of the iron-mineralizing encapsulin-associated Firmicute (IMEF) system (Probable).

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