1qss
From Proteopedia
OCA (Talk | contribs)
(New page: 200px<br /><applet load="1qss" size="450" color="white" frame="true" align="right" spinBox="true" caption="1qss, resolution 2.30Å" /> '''DDGTP-TRAPPED CLOSED...)
Next diff →
Revision as of 22:49, 20 November 2007
|
DDGTP-TRAPPED CLOSED TERNARY COMPLEX OF THE LARGE FRAGMENT OF DNA POLYMERASE I FROM THERMUS AQUATICUS
Overview
The Taq DNA polymerase is the most commonly used enzyme in DNA sequencing., However, all versions of Taq polymerase are deficient in two respects: (i), these enzymes incorporate each of the four dideoxynucleoside 5', triphosphates (ddNTPs) at widely different rates during sequencing (ddGTP, for example, is incorporated 10 times faster than the other three ddNTPs), and (ii) these enzymes show uneven band-intensity or peak-height patterns, in radio-labeled or dye-labeled DNA sequence profiles, respectively. We, have determined the crystal structures of all four ddNTP-trapped closed, ternary complexes of the large fragment of the Taq DNA polymerase, (Klentaq1). The ddGTP-trapped complex structure differs from the other, three ternary complex structures by a large shift in the position of the, side chain of residue 660 in the O helix, resulting in additional hydrogen, bonds being formed between the guanidinium group of this residue and the, base of ddGTP. When Arg-660 is mutated to Asp, Ser, Phe, Tyr, or Leu, the, enzyme has a marked and selective reduction in ddGTP incorporation rate., As a result, the G track generated during DNA sequencing by these Taq, polymerase variants does not terminate prematurely, and higher, molecular-mass G bands are detected. Another property of these Taq, polymerase variants is that the sequencing patterns produced by these, enzymes are remarkably even in band-intensity and peak-height, distribution, thus resulting in a significant improvement in the accuracy, of DNA sequencing.
About this Structure
1QSS is a Single protein structure of sequence from Thermus aquaticus with MG and DG3 as ligands. Active as DNA-directed DNA polymerase, with EC number 2.7.7.7 Full crystallographic information is available from OCA.
Reference
Structure-based design of Taq DNA polymerases with improved properties of dideoxynucleotide incorporation., Li Y, Mitaxov V, Waksman G, Proc Natl Acad Sci U S A. 1999 Aug 17;96(17):9491-6. PMID:10449720
Page seeded by OCA on Wed Nov 21 00:57:09 2007
