5jgr | pdb_00005jgr
Spin-Labeled T4 Lysozyme Construct K43V1
Structural highlights
Function[ENLYS_BPT4] Endolysin with lysozyme activity that degrades host peptidoglycans and participates with the holin and spanin proteins in the sequential events which lead to the programmed host cell lysis releasing the mature viral particles. Once the holin has permeabilized the host cell membrane, the endolysin can reach the periplasm and break down the peptidoglycan layer.[1] Publication Abstract from PubMedPulsed electron paramagnetic resonance experiments can measure individual distances between two spin-labeled side chains in proteins in the range of approximately 1.5-8 nm. However, the flexibility of traditional spin-labeled side chains leads to diffuse spin density loci and thus distance distributions with relatively broad peaks, thereby complicating the interpretation of protein conformational states. Here we analyzed the spin-labeled V1 side chain, which is internally anchored and hence less flexible. Crystal structures of V1-labeled T4 lysozyme constructs carrying the V1 side chain on alpha-helical segments suggest that V1 side chains adopt only a few discrete rotamers. In most cases, only one rotamer is observed at a given site, explaining the frequently observed narrow distance distribution for doubly V1-labeled proteins. We used the present data to derive guidelines that may allow distance interpretation of other V1-labeled proteins for higher-precision structural modeling. Toward Precise Interpretation of DEER-Based Distance Distributions: Insights from Structural Characterization of V1 Spin-Labeled Side Chains.,Balo AR, Feyrer H, Ernst OP Biochemistry. 2016 Sep 20;55(37):5256-63. doi: 10.1021/acs.biochem.6b00608. Epub , 2016 Sep 2. PMID:27532325[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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