2m08

The solution structure of NmPin, the parvuline of Nitrosopumilus maritimus

spinqualitylabelsall models 2m08, 20 NMR models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2m08 is a 1 chain structure with sequence from Candidatus nitrosopumilus maritimus scm1. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Gene: nmar0942, Nmar_0942 (Candidatus Nitrosopumilus maritimus SCM1) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed BACKGROUND: Peptidyl-prolyl isomerases (PPIases) are present in all forms of life and play a crucial role in protein folding and regulation. They catalyze the cis-trans isomerization of the peptide bond that precedes proline residues in numerous proteins. The parvulins, which is one family of PPIases, have been extensively investigated in several eukaryotes. However, nothing is known about their expression, function and localization in archaea. RESULTS: Here, we describe the endogenous expression, molecular structure, function and cellular localization of NmPin, a single-domain parvulin-type PPIase from Nitrosopumilus maritimus. This marine chemolithoautotrophic archaeon belongs to the globally abundant phylum Thaumarchaeota. Using high resolution NMR spectroscopy we demonstrate that the 3D structure of NmPin adopts a parvulin fold and confirmed its peptidyl-prolyl isomerase activity by protease-coupled assays and mutagenesis studies. A detailed topological analysis revealed a positively charged lysine-rich patch on the protein surface, which is conserved in all known parvulin sequences of thaumarchaeotes and targets NmPin to lipids in vitro. Immunofluorescence microscopy confirms that the protein is attached to the outer archaeal cell membrane in vivo. Transmission electron microscopy uncovered that NmPin has a uniform distribution at the membrane surface, which is correlated with a native cell shape of the prokaryote. CONCLUSION: We present a novel solution structure of a catalytically active thaumarchaeal parvulin. Our results reveal that a lysine-rich patch in NmPin mediates membrane localization. These findings provide a model whereby NmPin is located between the archaeal membrane and the surface layer and hence suggest proteins of the S-layer as the key target substrates of this parvulin. NmPin from the marine thaumarchaeote Nitrosopumilus maritimus is an active membrane associated prolyl isomerase.,Hoppstock L, Trusch F, Lederer C, van West P, Koenneke M, Bayer P BMC Biol. 2016 Jun 27;14(1):53. doi: 10.1186/s12915-016-0274-1. PMID:27349962 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Peptidyl-prolyl cis-trans isomerase 3D structures

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