5XHN

Crystal structure of Frog M-ferritin K104E mutant

Summary for 5XHN

• Entry DOI: 10.2210/pdb5xhn/pdb
• Related: 5XHI 5XHM 5XHO
• Descriptor: Ferritin, middle subunit, MAGNESIUM ION, CHLORIDE ION, ... (4 entities in total)
• Functional Keywords: ferritin, m-ferritin, oxidoreductase
• Biological source: Lithobates catesbeiana (American bullfrog)
• Total number of polymer chains: 1
• Total formula weight: 21086.49

Authors

Jagdev, M.K.,Vasudevan, D. (deposition date: 2017-04-21, release date: 2017-08-09, Last modification date: 2023-11-22)

Primary citation

Subhadarshanee, B.,Mohanty, A.,Jagdev, M.K.,Vasudevan, D.,Behera, R.K.
Surface charge dependent separation of modified and hybrid ferritin in native PAGE: Impact of lysine 104
Biochim. Biophys. Acta, 1865:1267-1273, 2017

PubMed Abstract: Preparation of modified and hybrid ferritin provides a great opportunity to understand the mechanisms of iron loading/unloading, protein self-assembly, size constrained nanomaterial synthesis and targeted drug delivery. However, the large size (M.W.=490kDa) has been limiting the separation of different modified and/or hybrid ferritin nanocages from each other in their intact assembled form and further characterization. Native polyacrylamide gel electrophoresis (PAGE) separates proteins on the basis of both charge and mass, while maintaining their overall native structure and activity. Altering surface charge distribution by substitution of amino acid residues located at the external surface of ferritin (K104E & D40A) affected the migration rate in native PAGE while internal modification had little effect. Crystal structures confirmed that ferritin nanocages made up of subunits with single amino acid substitutions retain the overall structure of ferritin nanocage. Taking advantage of K104E migration behavior, formation of hybrid ferritins with subunits of wild type (WT) and K104E were confirmed and separated in native PAGE. Cage integrity and iron loading ability (ferritin activity) were also tested. The migration pattern of hybrid ferritins in native PAGE depends on the subunit ratio (WT: K104E) in the ferritin cage. Our work shows that native PAGE can be exploited in nanobiotechnology, by analyzing modifications of large proteins like ferritin.

PubMed: 28739445
DOI: 10.1016/j.bbapap.2017.07.012

Experimental method

X-RAY DIFFRACTION (1.63 Å)