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|1fha, resolution 2.40Å ()|
SOLVING THE STRUCTURE OF HUMAN H FERRITIN BY GENETICALLY ENGINEERING INTERMOLECULAR CRYSTAL CONTACTS
Ferritin is important in iron homeostasis. Its twenty-four chains of two types, H and L, assemble as a hollow shell providing an iron-storage cavity. Ferritin molecules in cells containing high levels of iron tend to be rich in L chains, and may have a long-term storage function, whereas H-rich ferritins are more active in iron metabolism. The molecular basis for the greater activity of H-rich ferritins has until now been obscure, largely because the structure of H-chain ferritin has remained unknown owing to the difficulties in obtaining crystals ordered enough for X-ray crystallographic analysis. Here we report the three-dimensional structure of a human ferritin H-chain homopolymer. By genetically engineering a change in the sequence of the intermolecular contact region, we obtained crystals isomorphous with the homologous rat L ferritin and of high enough quality for X-ray diffraction analysis. The X-ray structure of human H ferritin shows a novel metal site embedded within each of its four-helix bundles and we suggest that ferroxidase activity associated with this site accounts for its rapid uptake of iron.
Solving the structure of human H ferritin by genetically engineering intermolecular crystal contacts., Lawson DM, Artymiuk PJ, Yewdall SJ, Smith JM, Livingstone JC, Treffry A, Luzzago A, Levi S, Arosio P, Cesareni G, et al., Nature. 1991 Feb 7;349(6309):541-4. PMID:1992356
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
About this Structure
1fha is a 1 chain structure with sequence from Homo sapiens. The November 2002 RCSB PDB Molecule of the Month feature on Ferritin and Transferrin by David S. Goodsell is 10.2210/rcsb_pdb/mom_2002_11. Full crystallographic information is available from OCA.
- Lawson DM, Artymiuk PJ, Yewdall SJ, Smith JM, Livingstone JC, Treffry A, Luzzago A, Levi S, Arosio P, Cesareni G, et al.. Solving the structure of human H ferritin by genetically engineering intermolecular crystal contacts. Nature. 1991 Feb 7;349(6309):541-4. PMID:1992356 doi:http://dx.doi.org/10.1038/349541a0
- Chou KC. Does the folding type of a protein depend on its amino acid composition? FEBS Lett. 1995 Apr 17;363(1-2):127-31. PMID:7729532