This old version of Proteopedia is provided for student assignments while the new version is undergoing repairs. Content and edits done in this old version of Proteopedia after March 1, 2026 will eventually be lost when it is retired in about June of 2026.

Apply for new accounts at the new Proteopedia. Your logins will work in both the old and new versions.

4zm2

From Proteopedia

(Difference between revisions)

Jump to: navigation, search

Revision as of 18:35, 12 July 2016

Antitoxin Phd from phage P1 in complex with its operator DNA inverted repeat in a monoclinic space group

Structural highlights

4zm2 is a 8 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[PHD_BPP1] Antitoxin component of a toxin-antitoxin (TA) module. A labile antitoxin that binds to the doc toxin and neutralizes its toxic effect. Bacteriophage P1 lysogenizes bacteria as a low-copy number plasmid. Phd and doc proteins function in unison to stabilize plasmid number by inducing a lethal response to P1 plasmid prophage loss.^[1] ^[2] Binds to its own promoter repressing its expression; toxin doc acts as a corepressor or derepressor depending on the ratio, repressing or inducing expression.^[3] ^[4]

Publication Abstract from PubMed

Conditional cooperativity is a common mechanism involved in transcriptional regulation of prokaryotic type II toxin-antitoxin operons and is intricately related to bacterial persistence. It allows the toxin component of a toxin-antitoxin module to act as a co-repressor at low doses of toxin as compared to antitoxin. When toxin level exceeds a certain threshold, however, the toxin becomes a de-repressor. Most antitoxins contain an intrinsically disordered region (IDR) that typically is involved in toxin neutralization and repressor complex formation. To address how the antitoxin IDR is involved in transcription regulation, we studied the phd-doc operon from bacteriophage P1. We provide evidence that the IDR of Phd provides an entropic barrier precluding full operon repression in the absence of Doc. Binding of Doc results in a cooperativity switch and consequent strong operon repression, enabling context-specific modulation of the regulatory process. Variations of this theme are likely to be a common mechanism in the autoregulation of bacterial operons that involve intrinsically disordered regions.

An intrinsically disordered entropic switch determines allostery in Phd-Doc regulation.,Garcia-Pino A, De Gieter S, Talavera A, De Greve H, Efremov RG, Loris R Nat Chem Biol. 2016 May 2. doi: 10.1038/nchembio.2078. PMID:27159580^[5]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Magnuson R, Yarmolinsky MB. Corepression of the P1 addiction operon by Phd and Doc. J Bacteriol. 1998 Dec;180(23):6342-51. PMID:9829946
↑ Liu M, Zhang Y, Inouye M, Woychik NA. Bacterial addiction module toxin Doc inhibits translation elongation through its association with the 30S ribosomal subunit. Proc Natl Acad Sci U S A. 2008 Apr 15;105(15):5885-90. doi:, 10.1073/pnas.0711949105. Epub 2008 Apr 8. PMID:18398006 doi:10.1073/pnas.0711949105
↑ Magnuson R, Yarmolinsky MB. Corepression of the P1 addiction operon by Phd and Doc. J Bacteriol. 1998 Dec;180(23):6342-51. PMID:9829946
↑ Liu M, Zhang Y, Inouye M, Woychik NA. Bacterial addiction module toxin Doc inhibits translation elongation through its association with the 30S ribosomal subunit. Proc Natl Acad Sci U S A. 2008 Apr 15;105(15):5885-90. doi:, 10.1073/pnas.0711949105. Epub 2008 Apr 8. PMID:18398006 doi:10.1073/pnas.0711949105
↑ Garcia-Pino A, De Gieter S, Talavera A, De Greve H, Efremov RG, Loris R. An intrinsically disordered entropic switch determines allostery in Phd-Doc regulation. Nat Chem Biol. 2016 May 2. doi: 10.1038/nchembio.2078. PMID:27159580 doi:http://dx.doi.org/10.1038/nchembio.2078

1 Structural highlights
2 Function
3 Publication Abstract from PubMed
4 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/4zm2"

@@ Line 4: / Line 4: @@
 == Structural highlights ==
 <table><tr><td colspan='2'>[[4zm2]] is a 8 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4ZM2 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4ZM2 FirstGlance]. <br>
-</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4zm2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4zm2 OCA], [http://pdbe.org/4zm2 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4zm2 RCSB], [http://www.ebi.ac.uk/pdbsum/4zm2 PDBsum]</span></td></tr>
+</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4zm2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4zm2 OCA], [http://pdbe.org/4zm2 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4zm2 RCSB], [http://www.ebi.ac.uk/pdbsum/4zm2 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4zm2 ProSAT]</span></td></tr>
 </table>
 == Function ==

4zm2

From Proteopedia

Revision as of 18:35, 12 July 2016

Antitoxin Phd from phage P1 in complex with its operator DNA inverted repeat in a monoclinic space group

Structural highlights

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

Personal tools

Navigation

Search

Toolbox