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1zx9

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[[Image:1zx9.gif|left|200px]]
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{{STRUCTURE_1zx9| PDB=1zx9 | SCENE= }}
{{STRUCTURE_1zx9| PDB=1zx9 | SCENE= }}
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'''Crystal Structure of Tn501 MerA'''
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===Crystal Structure of Tn501 MerA===
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==Overview==
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The ligand binding and catalytic properties of heavy metal ions have led to the evolution of metal ion-specific pathways for control of their intracellular trafficking and/or elimination. Small MW proteins/domains containing a GMTCXXC metal binding motif in a betaalphabetabetaalphabeta fold are common among proteins controlling the mobility of soft metal ions such as Cu(1+), Zn(2+), and Hg(2+), and the functions of several have been established. In bacterial mercuric ion reductases (MerA), which catalyze reduction of Hg(2+) to Hg(0) as a means of detoxification, one or two repeats of sequences with this fold are highly conserved as N-terminal domains (NmerA) of uncertain function. To simplify functional analysis of NmerA, we cloned and expressed the domain and catalytic core of Tn501 MerA as separate proteins. In this paper, we show Tn501 NmerA to be a stable, soluble protein that binds 1 Hg(2+)/domain and delivers it to the catalytic core at kinetically competent rates. Comparison of steady-state data for full-length versus catalytic core MerA using Hg(glutathione)(2) or Hg(thioredoxin) as substrate demonstrates that the NmerA domain does participate in acquisition and delivery of Hg(2+) to the catalytic core during the reduction catalyzed by full-length MerA, particularly when Hg(2+) is bound to a protein. Finally, comparison of growth curves for glutathione-depleted Escherichia coli expressing either catalytic core, full-length, or a combination of core plus NmerA shows an increased protection of cells against Hg(2+) in the media when NmerA is present, providing the first evidence of a functional role for this highly conserved domain.
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(as it appears on PubMed at http://www.pubmed.gov), where 16114877 is the PubMed ID number.
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{{ABSTRACT_PUBMED_16114877}}
==About this Structure==
==About this Structure==
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[[Category: Zelikova, J.]]
[[Category: Zelikova, J.]]
[[Category: Mercuric ion reductase]]
[[Category: Mercuric ion reductase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 19:41:52 2008''

Revision as of 16:41, 27 July 2008

Image:1zx9.png

Template:STRUCTURE 1zx9

Crystal Structure of Tn501 MerA

Template:ABSTRACT PUBMED 16114877

About this Structure

1ZX9 is a Single protein structure of sequence from Pseudomonas aeruginosa. Full crystallographic information is available from OCA.

Reference

NmerA, the metal binding domain of mercuric ion reductase, removes Hg2+ from proteins, delivers it to the catalytic core, and protects cells under glutathione-depleted conditions., Ledwidge R, Patel B, Dong A, Fiedler D, Falkowski M, Zelikova J, Summers AO, Pai EF, Miller SM, Biochemistry. 2005 Aug 30;44(34):11402-16. PMID:16114877

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