Crystal structure of trehalose-6-phosphate phosphatase-related protein: biochemical and biological implications |
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Authors: | Rao Krishnamurthy N Kumaran Desigan Seetharaman Jayaraman Bonanno Jeffrey B Burley Stephen K Swaminathan Subramanyam |
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Affiliation: | Biology Department, Brookhaven National Laboratory, Upton, NY 11973, USA. |
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Abstract: | We report here the crystal structure of a trehalose-6-phosphate phosphatase-related protein (T6PP) from Thermoplasma acidophilum, TA1209, determined by the dual-wavelength anomalous diffraction (DAD) method. T6PP is a member of the haloacid dehalogenase (HAD) superfamily with significant sequence homology with trehalose-6-phosphate phosphatase, phosphoserine phosphatase, P-type ATPases and other members of the family. T6PP possesses a core domain of known alpha/beta-hydrolase fold, characteristic of the HAD family, and a cap domain, with a tertiary fold consisting of a four-stranded beta-sheet with two alpha-helices on one side of the sheet. An active-site magnesium ion and a glycerol molecule bound at the interface between the two domains provide insight into the mode of substrate binding by T6PP. A trehalose-6-phosphate molecule modeled into a cage formed by the two domains makes favorable interactions with the protein molecule. We have confirmed that T6PP is a trehalose phosphatase from amino acid sequence, three-dimensional structure, and biochemical assays. |
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Keywords: | enzymes structure/function studies structure crystallography protein structures structural genomics phosphatase |
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