期刊
JOURNAL OF MOLECULAR BIOLOGY
卷 325, 期 5, 页码 1019-1030出版社
ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD
DOI: 10.1016/S0022-2836(02)01284-6
关键词
acetyl coenzyme A; crystal structure; GCN5-related N-acetyltransferase superfamily; histone acetyltransferase; tabtoxin resistance protein
Tabtoxin resistance protein (TTR) is an enzyme that renders tabtoxin-producing pathogens, such as Pseudomonas syringae, tolerant to their own phytotoxins. Here, we report the crystal structure of TTR complexed with its natural cofactor, acetyl coenzyme A (AcCoA), to 1.55 Angstrom resolution. The binary complex forms a characteristic V shape for substrate binding and contains the four motifs conserved in the GCN5-related N-acetyl-transferase (GNAT) superfamily, which also includes the histone acetyl-transferases (HATs). A single-step mechanism is proposed to explain the function of three conserved residues, Glu92, Asp130 and Tyr141, in catalyzing the acetyl group transfer to its substrate. We also report that TTR possesses HAT activity and suggest an evolutionary relationship between TTR and other GNAT members. (C) 2003 Elsevier Science Ltd. All rights reserved.
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