1b0n: Difference between revisions

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[[Image:1b0n.jpg|left|200px]]<br /><applet load="1b0n" size="~~450~~" color="white" frame="true" align="right" spinBox="true"

[[Image:1b0n.jpg|left|200px]]<br /><applet load="1b0n" size="350" color="white" frame="true" align="right" spinBox="true"

caption="1b0n, resolution 1.90Å" />

'''SINR PROTEIN/SINI PROTEIN COMPLEX'''<br />

==Overview==

Spore formation is an extreme response of some bacteria to adversity. In, Bacillus subtilis the proteins of the sin, sporulation inhibition, region, form a component of an elaborate molecular circuitry that regulates the, commitment to sporulation. SinR is a tetrameric repressor protein that, binds to the promoters of genes essential for entry into sporulation and, prevents their transcription. This repression is overcome through the, activity of SinI, which disrupts the SinR tetramer through the formation, of a SinI-SinR heterodimer. The interactions governing this curious, quaternary transition are revealed in the crystal structure of the, SinI-SinR complex. The most striking, and unexpected, finding is that the, tertiary structure of the DNA-binding domain of SinR is identical with, that of the corresponding domains of the repressor proteins, CI and Cro, of bacteriophage 434 that regulate lysis/lysogeny. This structural, similarity greatly exceeds that between SinR and any bacterial protein or, between the 434 repressor proteins and their homologues in the closely, related bacteriophage lambda. The close evolutionary relationship implied, by the structures of SinR and the 434 repressors provokes both comparison, of their functions and a speculative consideration of the intriguing, possibility of an evolutionary link between the two adaptive responses, sporulation and prophage induction.

Spore formation is an extreme response of some bacteria to adversity. In Bacillus subtilis the proteins of the sin, sporulation inhibition, region form a component of an elaborate molecular circuitry that regulates the commitment to sporulation. SinR is a tetrameric repressor protein that binds to the promoters of genes essential for entry into sporulation and prevents their transcription. This repression is overcome through the activity of SinI, which disrupts the SinR tetramer through the formation of a SinI-SinR heterodimer. The interactions governing this curious quaternary transition are revealed in the crystal structure of the SinI-SinR complex. The most striking, and unexpected, finding is that the tertiary structure of the DNA-binding domain of SinR is identical with that of the corresponding domains of the repressor proteins, CI and Cro, of bacteriophage 434 that regulate lysis/lysogeny. This structural similarity greatly exceeds that between SinR and any bacterial protein or between the 434 repressor proteins and their homologues in the closely related bacteriophage lambda. The close evolutionary relationship implied by the structures of SinR and the 434 repressors provokes both comparison of their functions and a speculative consideration of the intriguing possibility of an evolutionary link between the two adaptive responses, sporulation and prophage induction.

==About this Structure==

1B0N is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Bacillus_subtilis Bacillus subtilis] with ZN as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://~~ispc~~.weizmann.ac.il/oca-bin/ocashort?id=1B0N OCA].

1B0N is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Bacillus_subtilis Bacillus subtilis] with <scene name='pdbligand=ZN:'>ZN</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1B0N OCA].

==Reference==

Line 13:

[[Category: Bacillus subtilis]]

[[Category: Protein complex]]

[[Category: Brannigan, J.A.]]

[[Category: Brannigan, J A.]]

[[Category: Lewis, R.J.]]

[[Category: Lewis, R J.]]

[[Category: Offen, W.A.]]

[[Category: Offen, W A.]]

[[Category: Smith, I.]]

[[Category: Wilkinson, A.J.]]

[[Category: Wilkinson, A J.]]

[[Category: ZN]]

[[Category: antagonist]]

Line 23:

[[Category: transcription regulator]]

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@@ Line 1: / Line 1: @@
-[[Image:1b0n.jpg|left|200px]]<br /><applet load="1b0n" size="450" color="white" frame="true" align="right" spinBox="true"
+[[Image:1b0n.jpg|left|200px]]<br /><applet load="1b0n" size="350" color="white" frame="true" align="right" spinBox="true"
 caption="1b0n, resolution 1.90&Aring;" />
 '''SINR PROTEIN/SINI PROTEIN COMPLEX'''<br />
 ==Overview==
-Spore formation is an extreme response of some bacteria to adversity. In, Bacillus subtilis the proteins of the sin, sporulation inhibition, region, form a component of an elaborate molecular circuitry that regulates the, commitment to sporulation. SinR is a tetrameric repressor protein that, binds to the promoters of genes essential for entry into sporulation and, prevents their transcription. This repression is overcome through the, activity of SinI, which disrupts the SinR tetramer through the formation, of a SinI-SinR heterodimer. The interactions governing this curious, quaternary transition are revealed in the crystal structure of the, SinI-SinR complex. The most striking, and unexpected, finding is that the, tertiary structure of the DNA-binding domain of SinR is identical with, that of the corresponding domains of the repressor proteins, CI and Cro, of bacteriophage 434 that regulate lysis/lysogeny. This structural, similarity greatly exceeds that between SinR and any bacterial protein or, between the 434 repressor proteins and their homologues in the closely, related bacteriophage lambda. The close evolutionary relationship implied, by the structures of SinR and the 434 repressors provokes both comparison, of their functions and a speculative consideration of the intriguing, possibility of an evolutionary link between the two adaptive responses, sporulation and prophage induction.
+Spore formation is an extreme response of some bacteria to adversity. In Bacillus subtilis the proteins of the sin, sporulation inhibition, region form a component of an elaborate molecular circuitry that regulates the commitment to sporulation. SinR is a tetrameric repressor protein that binds to the promoters of genes essential for entry into sporulation and prevents their transcription. This repression is overcome through the activity of SinI, which disrupts the SinR tetramer through the formation of a SinI-SinR heterodimer. The interactions governing this curious quaternary transition are revealed in the crystal structure of the SinI-SinR complex. The most striking, and unexpected, finding is that the tertiary structure of the DNA-binding domain of SinR is identical with that of the corresponding domains of the repressor proteins, CI and Cro, of bacteriophage 434 that regulate lysis/lysogeny. This structural similarity greatly exceeds that between SinR and any bacterial protein or between the 434 repressor proteins and their homologues in the closely related bacteriophage lambda. The close evolutionary relationship implied by the structures of SinR and the 434 repressors provokes both comparison of their functions and a speculative consideration of the intriguing possibility of an evolutionary link between the two adaptive responses, sporulation and prophage induction.
 ==About this Structure==
-B0N is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Bacillus_subtilis Bacillus subtilis] with ZN as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1B0N OCA].
+B0N is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Bacillus_subtilis Bacillus subtilis] with <scene name='pdbligand=ZN:'>ZN</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1B0N OCA].
 ==Reference==
@@ Line 13: / Line 13: @@
 [[Category: Bacillus subtilis]]
 [[Category: Protein complex]]
-[[Category: Brannigan, J.A.]]
+[[Category: Brannigan, J A.]]
-[[Category: Lewis, R.J.]]
+[[Category: Lewis, R J.]]
-[[Category: Offen, W.A.]]
+[[Category: Offen, W A.]]
 [[Category: Smith, I.]]
-[[Category: Wilkinson, A.J.]]
+[[Category: Wilkinson, A J.]]
 [[Category: ZN]]
 [[Category: antagonist]]
@@ Line 23: / Line 23: @@
 [[Category: transcription regulator]]
-''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Tue Nov 20 11:15:41 2007''
+''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 11:50:16 2008''