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1 Clinical Genomics Center, University Health Network, Toronto, Ontario, M5G 1L7, Canada
2 Division of Molecular and Structural Biology, Ontario Cancer Institute, Toronto, Ontario, M5G 2M9, Canada
3 Banting and Best Department of Medical Research, University of Toronto, Toronto, Ontario, M5G 1L6, Canada
4 Biosciences Division and Structural Biology Center, Argonne National Laboratory, Argonne, Illinois 60439, USA
Reprint requests to: Dinesh Christendat, Clinical Genomics Center, University Health Network, 101 College Street, Toronto, Ontario, M5G 1L7, Canada; e-mail: dinesh{at}uhnres.utoronto.ca; fax : (416) 340-4004.
As part of our structural proteomics initiative, we have determined the crystal structure of MTH1491, a previously uncharacterized hypothetical protein from Methanobacterium thermoautotrophicum. MTH1491 is one of numerous structural genomics targets selected in a genome-wide survey of uncharacterized proteins. It belongs to a family of proteins whose biological function is not known. The crystal structure of MTH1491, the first structure for this family of proteins, consists of an overall five-stranded parallel ß-sheet with strand order 51234 and flanking helices. The oligomeric form of this molecule is a trimer as seen from both crystal contacts and gel filtration studies. Analysis revealed that the structure of MTH1491 is similar to that of dehydrogenases, amidohydrolases, and oxidoreductases. Using a combination of sequence and structural analyses, we showed that MTH1491 does not belong to either the dehydrogenase or the amidohydrolase superfamilies of proteins.
Keywords: Hypothetical protein; structural proteomics; X-ray crystallography; structural biology
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