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1aqn

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[[Image:1aqn.jpg|left|200px]]
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{{STRUCTURE_1aqn| PDB=1aqn | SCENE= }}
{{STRUCTURE_1aqn| PDB=1aqn | SCENE= }}
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'''SUBTILISIN MUTANT 8324'''
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===SUBTILISIN MUTANT 8324===
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==Overview==
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Translational initiation factor 3 (IF3) is an RNA helix destabilizing protein which interacts with strongly conserved sequences in 16S rRNA, one at the 3' terminus and one in the central domain. It was therefore of interest to identify particular residues whose exposure changes upon IF3 binding. Chemical and enzymatic probing of central domain nucleotides of 16S rRNA in 30S ribosomal subunits was carried out in the presence and absence of IF3. Bases were probed with dimethyl sulfate (DMS), at A(N-1), C(N-3), and G(N-7), and with N-cyclohexyl-N'-[2-(N-methyl-4-morpholinio)ethyl] carbodiimide p-toluenesulfonate (CMCT), at G(N-1) and U(N-3). RNase T1 and nuclease S1 were used to probe unpaired nucleotides, and RNase V1 was used to monitor base-paired or stacked nucleotides. 30S subunits in physiological buffers were probed in the presence and absence of IF3. The sites of cleavage and modification were detected by primer extension. IF3 binding to 30S subunits was found to reduce the chemical reactivity and enzymatic accessibility of some sites and to enhance attack at other sites in the conserved central domain of 16S rRNA, residues 690-850. IF3 decreased CMCT attack at U701 and U793 and V1 attack at G722, G737, and C764; IF3 enhanced DMS attack at A814 and V1 attack at U697, G833, G847, and G849. Many of these central domain sites are strongly conserved and with the conserved 3'-terminal site define a binding domain for IF3 which correlates with a predicted cleft in two independent models of the 30S ribosomal subunit.
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The line below this paragraph, {{ABSTRACT_PUBMED_2514787}}, adds the Publication Abstract to the page
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(as it appears on PubMed at http://www.pubmed.gov), where 2514787 is the PubMed ID number.
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{{ABSTRACT_PUBMED_2514787}}
==About this Structure==
==About this Structure==
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[[Category: Hydrolase]]
[[Category: Hydrolase]]
[[Category: Serine proteinase]]
[[Category: Serine proteinase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 10:35:33 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 17:25:24 2008''

Revision as of 14:25, 30 June 2008

Image:1aqn.png

Template:STRUCTURE 1aqn

SUBTILISIN MUTANT 8324

Template:ABSTRACT PUBMED 2514787

About this Structure

1AQN is a Single protein structure of sequence from Bacillus amyloliquefaciens. Full crystallographic information is available from OCA.

Reference

Escherichia coli initiation factor 3 protein binding to 30S ribosomal subunits alters the accessibility of nucleotides within the conserved central region of 16S rRNA., Muralikrishna P, Wickstrom E, Biochemistry. 1989 Sep 19;28(19):7505-10. PMID:2514787

Page seeded by OCA on Mon Jun 30 17:25:24 2008

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