2c5s: Difference between revisions

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==Overview==

ThiI is an enzyme responsible for the formation of the modified base S(4)U, (4-thiouridine) found at position 8 in some prokaryotic tRNAs. This base, acts as a sensitive trigger for the response mechanism to UV exposure, providing protection against its damaging effects. We present the crystal, structure of Bacillus anthracis ThiI in complex with AMP, revealing an, extended tripartite architecture in which an N-terminal ferredoxin-like, domain (NFLD) connects the C-terminal catalytic PP-loop pyrophosphatase, domain with a THUMP domain, an ancient predicted RNA-binding domain that, is widespread in all kingdoms of life. We describe the structure of the, THUMP domain, which appears to be unrelated to RNA-binding domains of, known structure. Mapping the conserved residues of NFLD and the THUMP, domain onto the ThiI structure suggests that these domains jointly form, the tRNA-binding surface. The inaccessibility of U8 in the canonical, L-shaped form of tRNA, and the existence of a glycine-rich linker joining, the catalytic and RNA-binding moieties of ThiI suggest that structural, changes may occur in both molecules upon binding.

ThiI is an enzyme responsible for the formation of the modified base S(4)U (4-thiouridine) found at position 8 in some prokaryotic tRNAs. This base acts as a sensitive trigger for the response mechanism to UV exposure, providing protection against its damaging effects. We present the crystal structure of Bacillus anthracis ThiI in complex with AMP, revealing an extended tripartite architecture in which an N-terminal ferredoxin-like domain (NFLD) connects the C-terminal catalytic PP-loop pyrophosphatase domain with a THUMP domain, an ancient predicted RNA-binding domain that is widespread in all kingdoms of life. We describe the structure of the THUMP domain, which appears to be unrelated to RNA-binding domains of known structure. Mapping the conserved residues of NFLD and the THUMP domain onto the ThiI structure suggests that these domains jointly form the tRNA-binding surface. The inaccessibility of U8 in the canonical L-shaped form of tRNA, and the existence of a glycine-rich linker joining the catalytic and RNA-binding moieties of ThiI suggest that structural changes may occur in both molecules upon binding.

==About this Structure==

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[[Category: Bacillus anthracis]]

[[Category: Single protein]]

[[Category: Antson, A.A.]]

[[Category: Antson, A A.]]

[[Category: Fogg, M.J.]]

[[Category: Fogg, M J.]]

[[Category: Koonin, E.V.]]

[[Category: Koonin, E V.]]

[[Category: Ortiz-Lombardia, M.]]

[[Category: Waterman, D.G.]]

[[Category: Waterman, D G.]]

[[Category: AMP]]

[[Category: 4-thiouridine synthase]]

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[[Category: trna modification]]

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@@ Line 4: / Line 4: @@
 ==Overview==
-ThiI is an enzyme responsible for the formation of the modified base S(4)U, (4-thiouridine) found at position 8 in some prokaryotic tRNAs. This base, acts as a sensitive trigger for the response mechanism to UV exposure, providing protection against its damaging effects. We present the crystal, structure of Bacillus anthracis ThiI in complex with AMP, revealing an, extended tripartite architecture in which an N-terminal ferredoxin-like, domain (NFLD) connects the C-terminal catalytic PP-loop pyrophosphatase, domain with a THUMP domain, an ancient predicted RNA-binding domain that, is widespread in all kingdoms of life. We describe the structure of the, THUMP domain, which appears to be unrelated to RNA-binding domains of, known structure. Mapping the conserved residues of NFLD and the THUMP, domain onto the ThiI structure suggests that these domains jointly form, the tRNA-binding surface. The inaccessibility of U8 in the canonical, L-shaped form of tRNA, and the existence of a glycine-rich linker joining, the catalytic and RNA-binding moieties of ThiI suggest that structural, changes may occur in both molecules upon binding.
+ThiI is an enzyme responsible for the formation of the modified base S(4)U (4-thiouridine) found at position 8 in some prokaryotic tRNAs. This base acts as a sensitive trigger for the response mechanism to UV exposure, providing protection against its damaging effects. We present the crystal structure of Bacillus anthracis ThiI in complex with AMP, revealing an extended tripartite architecture in which an N-terminal ferredoxin-like domain (NFLD) connects the C-terminal catalytic PP-loop pyrophosphatase domain with a THUMP domain, an ancient predicted RNA-binding domain that is widespread in all kingdoms of life. We describe the structure of the THUMP domain, which appears to be unrelated to RNA-binding domains of known structure. Mapping the conserved residues of NFLD and the THUMP domain onto the ThiI structure suggests that these domains jointly form the tRNA-binding surface. The inaccessibility of U8 in the canonical L-shaped form of tRNA, and the existence of a glycine-rich linker joining the catalytic and RNA-binding moieties of ThiI suggest that structural changes may occur in both molecules upon binding.
 ==About this Structure==
@@ Line 13: / Line 13: @@
 [[Category: Bacillus anthracis]]
 [[Category: Single protein]]
-[[Category: Antson, A.A.]]
+[[Category: Antson, A A.]]
-[[Category: Fogg, M.J.]]
+[[Category: Fogg, M J.]]
-[[Category: Koonin, E.V.]]
+[[Category: Koonin, E V.]]
 [[Category: Ortiz-Lombardia, M.]]
-[[Category: Waterman, D.G.]]
+[[Category: Waterman, D G.]]
 [[Category: AMP]]
 [[Category: 4-thiouridine synthase]]
@@ Line 28: / Line 28: @@
 [[Category: trna modification]]
-''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Feb  3 10:31:50 2008''
+''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 16:45:17 2008''