REQUIREMENT OF CARBON-DIOXIDE FOR IN-VITRO ASSEMBLY OF THE UREASE NICKEL METALLOCENTER

被引:146
作者
PARK, IS
HAUSINGER, RP
机构
[1] MICHIGAN STATE UNIV,DEPT MICROBIOL,E LANSING,MI 48824
[2] MICHIGAN STATE UNIV,DEPT BIOCHEM,E LANSING,MI 48824
关键词
D O I
10.1126/science.7855593
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Assembly of protein metallocenters is not well understood. Urease offers a tractable system for examination of this process. Formation of the urease metallocenter in vivo is known to require four accessory proteins: UreD, postulated to be a urease-specific molecular chaperone; UreE, a nickel(II)-binding protein; and UreF and UreG, of unknown function. Activation of purified Klebsiella aerogenes urease apoprotein was accomplished in vitro by providing carbon dioxide (half-maximal activation at similar to 0.2 percent carbon dioxide) in addition to nickel ion. Activation coincided with carbon dioxide incorporation into urease in a pH-dependent reaction (pK(a) greater than or equal to 9, where K-a is the acid constant). The concentration of carbon dioxide also affected the amount of activation of UreD-urease apoprotein complexes. These results suggest that carbon dioxide binding to urease apoprotein generates a ligand that facilitates productive nickel binding.
引用
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页码:1156 / 1158
页数:3
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