E. coli SSB tetramer binds the first and second molecules of (dT)(35) with heat capacities of opposite sign.
E. coli SSB tetramer binds the first and second molecules of (dT)(35) with heat capacities of opposite sign.
复制标题
DOI:
10.1016/j.bpc.2011.05.005
复制
发表时间:
2011-11
影响因子:
3.8
通讯作者:
Lohman TM
中科院分区:
文献类型:
--
作者:
Kozlov AG;Lohman TM
We have previously shown that formation of a 1:1 fully wrapped complex of E. coli SSB tetramer with (dT)70 displays a temperature-dependent sign reversal of the binding heat capacity (ΔCP). Here we examine SSB binding to shorter oligodeoxynucleotides ((dX)35) to probe whether this effect requires binding of one or two (dX)35 molecules per SSB tetramer. We find that the ΔCP for the first molecule of (dX)35 is always negative. However, a sign reversal of ΔCP from negative to positive occurs with increasing temperature for binding of the second (dX)35. This striking behavior of ΔCP for the second (dX)35 appears linked to conformational changes within the ssDNA-SSB complex that are required to form a fully wrapped (SSB)65 binding mode. These results also underscore that binding heat capacities of macromolecular interactions have multiple origins that cannot be understood simply on the basis of examining static structures.
登录
查看更多内容
影响因子:
5.6
作者:
Holbrook, JA;Tsodikov, OV;Record, MT
通讯作者:
Record, MT
影响因子:
5.6
作者:
Kuznetsov, Serguei V.;Kozlov, Alexander G.;Ansari, Anjum
通讯作者:
Ansari, Anjum
影响因子:
2.9
作者:
FERRARI, ME;LOHMAN, TM
通讯作者:
LOHMAN, TM
DOI:
10.1073/pnas.57.2.423
发表时间:
1967-01-01
影响因子:
11.1
作者:
ADLER, A;GROSSMAN, L;FASMAN, GD
通讯作者:
FASMAN, GD
影响因子:
2.9
作者:
Kozlov, Alexander G.;Jezewska, Maria J.;Lohman, Timothy M.
通讯作者:
Lohman, Timothy M.