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J Struct Funct Genomics. 2011 Mar;12(1):27-32. doi: 10.1007/s10969-010-9099-2. Epub 2010 Dec 14.

Solution NMR and X-ray crystal structures of membrane-associated Lipoprotein-17 domain reveal a novel fold.

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Center for Advanced Biotechnology and Medicine, Department of Molecular Biology and Biochemistry, Rutgers, The State University of New Jersey, Piscataway, 08854, USA.


The conserved Lipoprotein-17 domain of membrane-associated protein Q9PRA0_UREPA from Ureaplasma parvum was selected for structure determination by the Northeast Structural Genomics Consortium, as part of the Protein Structure Initiative's program on structure-function analysis of protein domains from large domain sequence families lacking structural representatives. The 100-residue Lipoprotein-17 domain is a "domain of unknown function" (DUF) that is a member of Pfam protein family PF04200, a large domain family for which no members have characterized biochemical functions. The three-dimensional structure of the Lipoprotein-17 domain of protein Q9PRA0_UREPA was determined by both solution NMR and by X-ray crystallography at 2.5 Å. The two structures are in good agreement with each other. The domain structure features three α-helices, α1 through α3, and five β-strands. Strands β1/β2, β3/β4, β4/β5 are anti-parallel to each other. Strands β1and β2 are orthogonal to strands β3, β4, β5, while helix α3 is formed between the strands β3 and β4. One-turn helix α2 is formed between the strands β1 and β2, while helix α1 occurs in the N-terminal polypeptide segment. Searches of the Protein Data Bank do not identify any other protein with significant structural similarity to Lipoprotein-17 domain of Q9PRA0_UREPA, indicating that it is a novel protein fold.

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