2za7
From Proteopedia
recombinant horse L-chain apoferritin N-terminal deletion mutant (residues 1-4)
Structural highlights
FunctionFRIL_HORSE Stores iron in a soluble, non-toxic, readily available form. Important for iron homeostasis. Iron is taken up in the ferrous form and deposited as ferric hydroxides after oxidation. Also plays a role in delivery of iron to cells. Mediates iron uptake in capsule cells of the developing kidney (By similarity). Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe denaturation of recombinant horse L-chain apoferritin (rLF), which is composed of 24 L-chain subunits, in acidic solution was studied. Using two rLF mutants, lacking four (Fer4) or eight (Fer8) N-terminal amino acid residues, the effect of N-terminal residues on the protein's stability was investigated. Of the two mutants and wild-type rLF, the tertiary and secondary structures of Fer8 were found to be most sensitive to an acidic environment. The Fer8 protein dissociated easily into subunit dimers at or below pH 2.0. Comparing the crystal structures of the mutant proteins, deletion of the N-terminal residues was found to result in fewer inter- and intra-subunit hydrogen bonds. The loss of these bonds is assumed to be responsible for lower endurance against acidic denaturation in N-terminus-deleted mutants. These results indicated that the inter- and intra-subunit hydrogen bonds of N-terminal residues affect the denaturation, especially oligomer formation of apoferritin subunits and will be of use in designing ferritin-based nanodevices. Effect of N-terminal residues on the structural stability of recombinant horse L-chain apoferritin in an acidic environment.,Yoshizawa K, Mishima Y, Park SY, Heddle JG, Tame JR, Iwahori K, Kobayashi M, Yamashita I J Biochem. 2007 Dec;142(6):707-13. Epub 2007 Oct 15. PMID:17938140[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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