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- ********************************************
- * Ferritin iron-binding regions signatures *
- ********************************************
-
- Ferritin [1,2] is one of the major non-heme iron storage proteins. It consists
- of a mineral core of hydrated ferric oxide, and a multi-subunit protein shell
- which englobes the former and assures its solubility in an aqueous
- environment.
-
- In animals the protein is mainly cytoplasmic and there are generally two or
- more genes that encodes for closely related subunits (in mammals there are two
- subunits which are known as H(eavy) and L(ight)). In plants ferritin is found
- in the chloroplast [3].
-
- There are a number of well conserved region in the sequence of ferritins. We
- have selected two of these regions to develop signature patterns. The first
- pattern is located in the central part of the sequence of ferritin and it
- contains three conserved glutamate which are thought to be involved in the
- binding of iron. The second pattern is located in the C-terminal section, it
- corresponds to a region which forms a hydrophilic channel through which small
- molecules and ions can gain access to the central cavity of the molecule; this
- pattern also includes conserved acidic residues which are potential metal
- binding sites.
-
- -Consensus pattern: E-x-[KR]-E-x(2)-E-[KR]-[LF]-[LIVMA]-x(2)-Q-N-x-R-x-G-R
- [The 3 E's are potential iron ligands]
- -Sequences known to belong to this class detected by the pattern: ALL, except
- for ferritin 1 from Schistosoma mansoni
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Consensus pattern: D-x(2)-[LIVMF]-[STAC]-[DH]-F-[LI]-[EN]-x(2)-[FY]-L-x(6)-
- [LIVM]-[KN]
- [The second D and the E are potential iron ligands]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Last update: October 1993 / Patterns and text revised.
-
- [ 1] Crichton R.R., Charloteaux-Wauters M.
- Eur. J. Biochem. 164:485-506(1987).
- [ 2] Theil E.C.
- Annu. Rev. Biochem. 56:289-315(1987).
- [ 3] Ragland M., Briat J.-F., Gagnon J., Laulhere J.-P., Massenet O.,
- Theil E.C.
- J. Biol. Chem. 265:18339-18344(1990).
-