Acetoxy drug: protein transacetylase of buffalo liver-characterization and mass spectrometry of the acetylated protein product

被引:30
作者
Kohli, E
Gaspari, M
Raj, HG [1 ]
Parmar, VS
Sharma, SK
van der Greef, J
Kumari, R
Gupta, G
Seema
Khurana, P
Tyagi, YK
Watterson, AC
Olsen, CE
机构
[1] Univ Delhi, Dept Biochem, VP Chest Inst, Delhi 110007, India
[2] TNO, Dept Analyt Sci, NL-3700 AJ Zeist, Netherlands
[3] Univ Delhi, Dept Chem, Bioorgan Lab, Delhi 110007, India
[4] Univ Massachusetts, Dept Chem, INS ET, Lowell, MA 01854 USA
[5] Leiden Univ, Div Analyt Biosci, Leiden Amsterdam Ctr Drug Res, Leiden, Netherlands
[6] Royal Vet & Agr Univ, Dept Chem, DK-1871 Frederiksberg C, Copenhagen, Denmark
来源
BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS | 2004年 / 1698卷 / 01期
关键词
transacetylase; acetoxy drug; protein acetylation; MALDI-TOF; protein mass spectrometry;
D O I
10.1016/j.bbapap.2003.10.004
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The purification and characterization of the buffalo liver microsomal transacetylase (TAase) catalyzing the transfer of acetyl groups from a model acetoxy drug: 7,8-diacetoxy-4-methylcoumarin (DAMC) to GST3-3 has been described here. The enzyme was routinely assayed using DAMC and cytosolic GST as the substrates and was partially purified from microsomes of the buffalo liver. The enzyme was found to have approximate molecular weight of 65 kDa. The action of TAase and DAMC on liver cytosolic GST resulted in the formation of monoacetoxymonohydroxy-4-methylcoumarin (MAMHC) and 7,8-dihydroxy-4-methylcoumarin (DHMC), although the former was the major metabolite. The buffalo liver microsomal TAase exhibited hyperbolic kinetics and yielded K-m (1667 muM) and V-max (192 units) when the concentration of DAMC was varied keeping the concentration of GST constant. After having characterized the nature of the substrates and a product of the TAase-catalyzed reaction, we set out to identify the acetylated protein which is another product of the reaction. GST3-3 was used as a model protein substrate for the action of TAase using DAMC as the acetyl donor. The subunit of control and modified GST3-3 were separated by SDS-polyacrylamide gel electrophoresis (PAGE) and digested with trypsin. The tryptic peptides were extracted from the gel pieces and analyzed by matrix assisted laser desorption/ionization- time of flight-mass spectrometry (MALDI-TOFMS). The data search for calibrated and labeled mass peaks of peptides was performed on the Matrix Science Server using the search engine Mascot. The peptide maps so obtained covered 97% of the GST3-3 sequence. On comparison of MALDI peptide maps of modified and control GST, seven new peaks were recognized corresponding to the potentially acetylated peptides in peptide map. The mass value of each of them was 42 Da higher than the theoretical mass of a non-modified GST3-3 tryptic peptide, strongly suggesting acetylation. By examining the fragmentation patterns and by comparing experimental and predicted values for MS/MS daughter ions, the identity of the seven acetylated GST tryptic peptides could be confirmed by the application of LC/MS/MS. In the modified GST, N-terminal proline and six lysines (Lys(51), Lys(82), Lys(123), Lsy(181), Lys(191), and Lys(210)) were found to be acetylated. The structure of acetylated GST revealed that the lysines that underwent acetylation were peripheral in positions. (C) 2003 Elsevier B.V. All rights reserved.
引用
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页码:55 / 66
页数:12
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