Redox-induced changes in flavin structure and roles of flavin N(5) and the ribityl 2'-OH group in regulating PutA--membrane binding.
Redox-induced changes in flavin structure and roles of flavin N(5) and the ribityl 2'-OH group in regulating PutA--membrane binding.
复制标题
氧化还原诱导的黄素结构变化以及黄素 N(5) 和 ribityl 2-OH 基团在调节 PutA-膜结合中的作用。
DOI:
10.1021/bi061935g
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发表时间:
2007
期刊:
影响因子:
2.9
通讯作者:
Becker,DonaldF
中科院分区:
文献类型:
--
作者:
Zhang,Weimin;Zhang,Min;Zhu,Weidong;Zhou,Yuzhen;Wanduragala,Srimevan;Rewinkel,Dustin;Tanner,JohnJ;Becker,DonaldF
PutA is a novel flavoprotein inEscherichia colithat switches from a transcriptional repressor to a membrane-bound proline catabolic enzyme. Previous crystallographic studies of the PutA proline dehydrogenase (PRODH) domain under oxidizing conditions revealed that FAD N(5) and the ribityl 2‘-OH group form hydrogen bonds with Arg431 and Arg556, respectively. Here we identify molecular interactions in the PutA PRODH active site that underlie redox-dependent functional switching of PutA. We report that reduction of the PRODH domain induces major structural changes in the FAD cofactor, including a 22° bend of the isoalloxazine ring along the N(5)−N(10) axis, crankshaft rotation of the upper part of the ribityl chain, and formation of a new hydrogen bond network involving the ribityl 2‘-OH group, FAD N(1), and Gly435. The roles of the FAD 2‘-OH group and the FAD N(5)−Arg431 hydrogen bond pair in regulating redox-dependent PutA−membrane associations were tested using FAD analogues and site-directed mutagenesis. Kinetic membrane binding measurements and cell-based reporter gene assays of modified PutA proteins show that disrupting the FAD N(5)−Arg431 interaction impairs the reductive activation of PutA−membrane binding. We also show that the FAD 2‘-OH group acts as a redox-sensitive toggle switch that controls PutA−membrane binding. These results illustrate a new versatility of the ribityl chain in flavoprotein mechanisms.
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DOI:
10.1073/pnas.90.16.7523
发表时间:
1993-08-15
影响因子:
11.1
作者:
KIM, JJP;WANG, M;PASCHKE, R
通讯作者:
PASCHKE, R
影响因子:
5.6
作者:
KARPLUS, PA;SCHULZ, GE
通讯作者:
SCHULZ, GE
DOI:
10.1073/pnas.93.25.14355
发表时间:
1996-12-10
影响因子:
11.1
作者:
Roberts, DL;Frerman, FE;Kim, JJP
通讯作者:
Kim, JJP
DOI:
10.1016/s0021-9258(18)52967-7
发表时间:
1993
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
E. Brown;J. M. Wood
通讯作者:
J. M. Wood
影响因子:
5.6
作者:
MATTEVI, A;SCHIERBEEK, AJ;HOL, WGJ
通讯作者:
HOL, WGJ