1r95
From Proteopedia
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'''Crystal Structure of IscA (native)''' | '''Crystal Structure of IscA (native)''' | ||
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[[Category: Ding, H.]] | [[Category: Ding, H.]] | ||
[[Category: Newcomer, M E.]] | [[Category: Newcomer, M E.]] | ||
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| - | [[Category: | + | [[Category: Iron-sulfur cluster protein]] |
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| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 07:13:57 2008'' | |
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Revision as of 04:13, 3 May 2008
Crystal Structure of IscA (native)
Overview
IscA belongs to an ancient family of proteins responsible for iron-sulfur cluster assembly in essential metabolic pathways preserved throughout evolution. We report here the 2.3 A resolution crystal structure of Escherichia coli IscA, a novel fold in which mixed beta-sheets form a compact alpha-beta sandwich domain. In contrast to the highly mobile secondary structural elements within the bacterial Fe-S scaffold protein IscU, a protein which is thought to have a similar function, the great majority of the amino acids that are conserved in IscA homologues are located in elements that constitute a well-ordered fold. However, the 10-residue C-terminal tail segment that contains two invariant cysteines critical for the Fe-S-binding function of a cyanobacterial (Synechocystis PCC) IscA homologue is not ordered in our structure. In addition, the crystal packing reveals a helical assembly that is constructed from two possible tetrameric oligomers of IscA.
About this Structure
1R95 is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.
Reference
Crystal structure of the ancient, Fe-S scaffold IscA reveals a novel protein fold., Bilder PW, Ding H, Newcomer ME, Biochemistry. 2004 Jan 13;43(1):133-9. PMID:14705938 Page seeded by OCA on Sat May 3 07:13:57 2008
