Protein: Type 1 encapsulin shell protein (IMEF encapsulin) (A0A0F5HPP7)
Organism: Bacillus thermotolerans (Quasibacillus thermotolerans)
Function: 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. Both types of pore have extra density in their centers in the structure. 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. Part of the iron-mineralizing encapsulin-associated Firmicute (IMEF) system (Probable).
Subcellular location: Encapsulin nanocompartment {ECO:0000269|PubMed:31194509, ECO:0000269|PubMed:31282860}.
InterPro domains:
- IPR051429: Encapsulin nanocompartment (family) [72-277]
- IPR007544: Type 1 encapsulin shell protein (family) [8-277]
Sequence:
MNKSQLYPDSPLTDQDFNQLDQTVIEAARRQLVGRRFIELYGPLGRGMQSVFNDIFMESHEAKMDFQGSFDTEVESSRRVNYTIPMLYKDFVLYWRDLEQSKALDIPIDFSVAANAARDVAFLEDQMIFHGSKEFDIPGLMNVKGRLTHLIGNWYESGNAFQDIVEARNKLLEMNHNGPYALVLSPELYSLLHRVHKDTNVLEIEHVRELITAGVFQSPVLKGKSGVIVNTGRNNLDLAISEDFETAYLGEEGMNHPFRVYETVVLRIKRPAAICTLIDPEE
Predicted GO terms:
Molecular Function (MF): GO:0003674 (molecular function), GO:0005488 (binding), GO:0097159 (organic cyclic compound binding), GO:1901363 (heterocyclic compound binding), GO:0005515 (protein binding), GO:0003676 (nucleic acid binding), GO:0042802 (identical protein binding), GO:0003677 (DNA binding)
Biological Process (BP): GO:0008150 (biological process), GO:0032502 (developmental process), GO:0009987 (cellular process), GO:0000003 (reproduction), GO:0032501 (multicellular organismal process), GO:0022414 (reproductive process), GO:0048869 (cellular developmental process), GO:0048856 (anatomical structure development), GO:0007275 (multicellular organism development), GO:0003006 (developmental process involved in reproduction), GO:0009791 (post-embryonic development), GO:0001708 (cell fate specification), GO:0045165 (cell fate commitment), GO:0048608 (reproductive structure development), GO:0030154 (cell differentiation), GO:0048731 (system development), GO:0010228 (vegetative to reproductive phase transition of meristem), GO:0061458 (reproductive system development)
Cellular Component (CC): GO:0005575 (cellular component), GO:0110165 (cellular anatomical entity), GO:0005622 (intracellular anatomical structure), GO:0043226 (organelle), GO:0043229 (intracellular organelle), GO:0043228 (non-membrane-bounded organelle), GO:0043232 (intracellular non-membrane-bounded organelle), GO:0140737 (encapsulin nanocompartment)