1z6o
From Proteopedia
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'''Crystal Structure of Trichoplusia ni secreted ferritin''' | '''Crystal Structure of Trichoplusia ni secreted ferritin''' | ||
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[[Category: Hamburger, Z A.]] | [[Category: Hamburger, Z A.]] | ||
[[Category: Jr., A P.West.]] | [[Category: Jr., A P.West.]] | ||
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Revision as of 14:14, 3 May 2008
Crystal Structure of Trichoplusia ni secreted ferritin
Overview
Ferritins are iron storage proteins made of 24 subunits forming a hollow spherical shell. Vertebrate ferritins contain varying ratios of heavy (H) and light (L) chains; however, known ferritin structures include only one type of chain and have octahedral symmetry. Here, we report the 1.9A structure of a secreted insect ferritin from Trichoplusia ni, which reveals equal numbers of H and L chains arranged with tetrahedral symmetry. The H/L-chain interface includes complementary features responsible for ordered assembly of the subunits. The H chain contains a ferroxidase active site resembling that of vertebrate H chains with an endogenous, bound iron atom. The L chain lacks the residues that form a putative iron core nucleation site in vertebrate L chains. Instead, a possible nucleation site is observed at the L chain 3-fold pore. The structure also reveals inter- and intrasubunit disulfide bonds, mostly in the extended N-terminal regions unique to insect ferritins. The symmetrical arrangement of H and L chains and the disulfide crosslinks reflect adaptations of insect ferritin to its role as a secreted protein.
About this Structure
1Z6O is a Protein complex structure of sequences from Trichoplusia ni. Full crystallographic information is available from OCA.
Reference
Crystal structure of a secreted insect ferritin reveals a symmetrical arrangement of heavy and light chains., Hamburger AE, West AP Jr, Hamburger ZA, Hamburger P, Bjorkman PJ, J Mol Biol. 2005 Jun 10;349(3):558-69. Epub 2005 Apr 12. PMID:15896348 Page seeded by OCA on Sat May 3 17:14:34 2008
