Identification of a novel phosphatase sequence motif

Protein Science - Tập 6 Số 2 - Trang 469-472 - 1997
Joseph Stukey1, George Carman2
1to: J. Stukey, Department of Biology, Hope College, P.O. Box 9000, Holland, Michigan 49422‐9000
2Department of Food Science, Rutgers University, Cook College, New Brunswick, New Jersey 08903

Tóm tắt

Abstract

We have identified a novel, conserved phosphatase sequence motif, KXXXXXXRP‐(X12‐54)‐PSGH‐(X31‐54))‐SRXXXXX HXXXD, that is shared among several lipid phosphatases, the mammalian glucose‐6‐phosphatases, and a collection of bacterial nonspecific acid phosphatases. This sequence was also found in the vanadium‐containing chloroperoxidase of Curvularia inaequalis. Several lines of evidence support this phosphatase motif identification. Crystal structure data on chloroperoxidase revealed that all three domains are in close proximity and several of the conserved residues are involved in the binding of the cofactor, vana‐date, a compound structurally similar to phosphate. Structure‐function analysis of the human glucose‐6‐phosphatase has shown that two of the conserved residues (the first domain arginine and the central domain histidine) are essential for enzyme activity. This conserved sequence motif was used to identify nine additional putative phosphatases from sequence databases, one of which has been determined to be a lipid phosphatase in yeast.

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Protein Science

Tập 6 Số 2

469-472

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