3k79

C38A, C52V Cysteine-Free Variant of Rop (Rom)

spinqualitylabelsall models 3k79, resolution 1.96Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3k79 is a 1 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.96Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function ROP_ECOLX Regulates plasmid DNA replication by modulating the initiation of transcription of the primer RNA precursor. Processing of the precursor of the primer, RNAII, is inhibited by hydrogen bonding of RNAII to its complementary sequence in RNAI. ROP increases the affinity of RNAI for RNAII and thus decreases the rate of replication initiation events. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Cysteine residues can complicate the folding and storage of proteins due to improper formation of disulfide bonds or oxidation of residues that are natively reduced. Wild-type Rop is a homodimeric four-helix bundle protein and an important model for protein design in the understanding of protein stability, structure and folding kinetics. In the native state, Rop has two buried, reduced cysteine residues in its core, but these are prone to oxidation in destabilized variants, particularly upon extended storage. To circumvent this problem, we designed and characterized a Cys-free variant of Rop, including solving the 2.3 A X-ray crystal structure. We show that the C38A C52V variant has similar structure, stability and in vivo activity to wild-type Rop, but that it has dramatically faster unfolding kinetics like virtually every other mutant of Rop that has been characterized. This cysteine-free Rop has already proven useful for studies on solution topology and on the relationship of core mutations to stability. It also suggests a general strategy for removal of pairs of Cys residues in proteins, both to make them more experimentally tractable and to improve their storage properties for therapeutic or industrial purposes. Cysteine-free Rop: A four-helix bundle core mutant has wild-type stability and structure but dramatically different unfolding kinetics.,Hari SB, Byeon C, Lavinder JJ, Magliery TJ Protein Sci. 2010 Jan 21. PMID:20095056 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Rop protein

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