2d2a: Difference between revisions

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[[Image:2d2a.gif|left|200px]]<br /><applet load="2d2a" size="~~450~~" color="white" frame="true" align="right" spinBox="true"

[[Image:2d2a.gif|left|200px]]<br /><applet load="2d2a" size="350" color="white" frame="true" align="right" spinBox="true"

caption="2d2a, resolution 2.70Å" />

'''Crystal Structure of Escherichia coli SufA Involved in Biosynthesis of Iron-sulfur Clusters'''<br />

==Overview==

IscA and SufA are paralogous proteins that play crucial roles in the, biosynthesis of Fe-S clusters, perhaps through a mechanism involving, transient Fe-S cluster formation. We have determined the crystal structure, of E. coli SufA at 2.7A resolution. SufA exists as a homodimer, in, contrast to the tetrameric organization of IscA. Furthermore, a C-terminal, segment containing two essential cysteine residues (Cys-Gly-Cys), which is, disordered in the IscA structure, is clearly visible in one molecule (the, alpha1 subunit) of the SufA homodimer. Although this segment is disordered, in the other molecule (the alpha2 subunit), computer modeling of this, segment based on the well-defined conformation of alpha1 subunit suggests, that the four cysteine residues (Cys114 and Cys116 in each subunit) in the, Cys-Gly-Cys motif are positioned in close proximity at the dimer, interface. The arrangement of these cysteines together with the nearby, Glu118 in SufA dimer may allow coordination of an Fe-S cluster and/or an, Fe atom.

IscA and SufA are paralogous proteins that play crucial roles in the biosynthesis of Fe-S clusters, perhaps through a mechanism involving transient Fe-S cluster formation. We have determined the crystal structure of E. coli SufA at 2.7A resolution. SufA exists as a homodimer, in contrast to the tetrameric organization of IscA. Furthermore, a C-terminal segment containing two essential cysteine residues (Cys-Gly-Cys), which is disordered in the IscA structure, is clearly visible in one molecule (the alpha1 subunit) of the SufA homodimer. Although this segment is disordered in the other molecule (the alpha2 subunit), computer modeling of this segment based on the well-defined conformation of alpha1 subunit suggests that the four cysteine residues (Cys114 and Cys116 in each subunit) in the Cys-Gly-Cys motif are positioned in close proximity at the dimer interface. The arrangement of these cysteines together with the nearby Glu118 in SufA dimer may allow coordination of an Fe-S cluster and/or an Fe atom.

==About this Structure==

2D2A is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://~~ispc~~.weizmann.ac.il/oca-bin/ocashort?id=2D2A OCA].

2D2A is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2D2A OCA].

==Reference==

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[[Category: yadr]]

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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 16:54:42 2008''

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@@ Line 1: / Line 1: @@
-[[Image:2d2a.gif|left|200px]]<br /><applet load="2d2a" size="450" color="white" frame="true" align="right" spinBox="true"
+[[Image:2d2a.gif|left|200px]]<br /><applet load="2d2a" size="350" color="white" frame="true" align="right" spinBox="true"
 caption="2d2a, resolution 2.70&Aring;" />
 '''Crystal Structure of Escherichia coli SufA Involved in Biosynthesis of Iron-sulfur Clusters'''<br />
 ==Overview==
-IscA and SufA are paralogous proteins that play crucial roles in the, biosynthesis of Fe-S clusters, perhaps through a mechanism involving, transient Fe-S cluster formation. We have determined the crystal structure, of E. coli SufA at 2.7A resolution. SufA exists as a homodimer, in, contrast to the tetrameric organization of IscA. Furthermore, a C-terminal, segment containing two essential cysteine residues (Cys-Gly-Cys), which is, disordered in the IscA structure, is clearly visible in one molecule (the, alpha1 subunit) of the SufA homodimer. Although this segment is disordered, in the other molecule (the alpha2 subunit), computer modeling of this, segment based on the well-defined conformation of alpha1 subunit suggests, that the four cysteine residues (Cys114 and Cys116 in each subunit) in the, Cys-Gly-Cys motif are positioned in close proximity at the dimer, interface. The arrangement of these cysteines together with the nearby, Glu118 in SufA dimer may allow coordination of an Fe-S cluster and/or an, Fe atom.
+IscA and SufA are paralogous proteins that play crucial roles in the biosynthesis of Fe-S clusters, perhaps through a mechanism involving transient Fe-S cluster formation. We have determined the crystal structure of E. coli SufA at 2.7A resolution. SufA exists as a homodimer, in contrast to the tetrameric organization of IscA. Furthermore, a C-terminal segment containing two essential cysteine residues (Cys-Gly-Cys), which is disordered in the IscA structure, is clearly visible in one molecule (the alpha1 subunit) of the SufA homodimer. Although this segment is disordered in the other molecule (the alpha2 subunit), computer modeling of this segment based on the well-defined conformation of alpha1 subunit suggests that the four cysteine residues (Cys114 and Cys116 in each subunit) in the Cys-Gly-Cys motif are positioned in close proximity at the dimer interface. The arrangement of these cysteines together with the nearby Glu118 in SufA dimer may allow coordination of an Fe-S cluster and/or an Fe atom.
 ==About this Structure==
-D2A is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=2D2A OCA].
+D2A is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2D2A OCA].
 ==Reference==
@@ Line 26: / Line 26: @@
 [[Category: yadr]]
-''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Wed Nov 21 09:24:02 2007''
+''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 16:54:42 2008''