Design of Ca2+-independent Staphylococcus aureus sortase A mutants

被引：74

作者：

Hirakawa, Hidehiko ^{[1
]}

Ishikawa, Suguru ^{[1
]}

Nagamune, Teruyuki ^{[1
,2
]}

机构：

[1] Univ Tokyo, Dept Chem & Biotechnol, Sch Engn, Bunkyo Ku, Tokyo 1138656, Japan

[2] Univ Tokyo, Dept Bioengn, Sch Engn, Bunkyo Ku, Tokyo 1138656, Japan

来源：

BIOTECHNOLOGY AND BIOENGINEERING | 2012年 / 109卷 / 12期

关键词：

Staphylococcus aureus; transpeptidase; sortase A; Ca2+-independent; mutation; ACTIVE-SITE; CELL-WALL; TRANSPEPTIDASE SORTASE; SORTING SIGNAL; LIGATION; PROTEINS; SRTA; CYCLIZATION;

D O I：

10.1002/bit.24585

中图分类号：

Q81 [生物工程学（生物技术）]; Q93 [微生物学];

学科分类号：

071005 ; 0836 ; 090102 ; 100705 ;

摘要：

The catalytic activity of Staphylococcus aureus sortase A (SaSrtA) is dependent on Ca2+, because binding of Ca2+ to Glu residues distal to the active site stabilizes the substrate binding site. To obtain Ca2+-independent SaSrtA, we substituted two Glu residues in the Ca2+-binding pocket (Glu105 and Glu108). Although single mutations decreased SaSrtA activity, mutations of both Glu105 and Glu108 resulted in Ca2+-independent activity. Kinetic analysis suggested that the double mutations affect the substrate binding site, without affecting substrate specificity. This approach will allow us to develop SaSrtA variants suitable for various applications, including in vivo site-specific protein modification and labeling. Biotechnol. Bioeng. 2012; 109: 29552961. (C) 2012 Wiley Periodicals, Inc.

引用

页码：2955 / 2961

页数：7

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