View source for 2bcv

[[Image:2bcv.gif|left|200px]]<br />
<applet load="2bcv" size="450" color="white" frame="true" align="right" spinBox="true" 
caption="2bcv, resolution 2.00&Aring;" />
'''DNA polymerase lambda in complex with Dttp and a DNA duplex containing an unpaired Dtmp'''<br />

==Overview==
Insertions and deletions in coding sequences can alter the reading frame, of genes and have profound biological consequences. In 1966, Streisinger, proposed that these mutations result from strand slippage, which in, repetitive sequences generates misaligned intermediates stabilized by, correct base pairing that support polymerization. We report here crystal, structures of human DNA polymerase lambda, which frequently generates, deletion mutations, bound to such intermediates. Each contains an, extrahelical template nucleotide upstream of the active site., Surprisingly, the extra nucleotide, even when combined with an adjacent, mismatch, does not perturb polymerase active site geometry, which is, indistinguishable from that for correctly aligned strands. These, structures reveal how pol lambda can polymerize on substrates with minimal, homology during repair of double-strand breaks and represent, strand-slippage intermediates consistent with Streisinger's classical, hypothesis. They are thus relevant to the origin of single-base deletions, a class of mutations that can confer strong biological phenotypes.

==About this Structure==
2BCV is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] with MG, NA and TTP as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=2BCV OCA]. 

==Reference==
Structural analysis of strand misalignment during DNA synthesis by a human DNA polymerase., Garcia-Diaz M, Bebenek K, Krahn JM, Pedersen LC, Kunkel TA, Cell. 2006 Jan 27;124(2):331-42. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=16439207 16439207]
[[Category: Homo sapiens]]
[[Category: Single protein]]
[[Category: Bebenek, K.]]
[[Category: Garcia-Diaz, M.]]
[[Category: Krahn, J.M.]]
[[Category: Kunkel, T.A.]]
[[Category: Pedersen, L.C.]]
[[Category: MG]]
[[Category: NA]]
[[Category: TTP]]
[[Category: deletion]]
[[Category: extrahelical]]
[[Category: misalignment]]
[[Category: mutagenesis]]
[[Category: mutation]]
[[Category: slippage]]
[[Category: streisinger]]

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