Abstract:
:In contrast to canonical phage endolysins, which require holin-mediated disruption of the membrane to gain access to attack the cell wall, signal anchor release (SAR) endolysins are secreted by the host sec system, where they accumulate in an inactive form tethered to the membrane by their N-terminal SAR domains. SAR endolysins become activated by various mechanisms upon release from the membrane. In its inactive form, the prototype SAR endolysin, Lyz(P1), of coliphage P1, has an active-site Cys covalently blocked by a disulfide bond; activation involves a disulfide bond isomerization driven by a thiol in the newly released SAR domain, unblocking the active-site Cys. Here, we report that Lyz(103), the endolysin of Erwinia phage ERA103, is also a SAR endolysin. Although Lyz(103) does not have a catalytic Cys, genetic evidence suggests that it also is activated by a thiol-disulfide isomerization triggered by a thiol in the SAR domain. In this case, the inhibitory disulfide in nascent Lyz(103) is formed between cysteine residues flanking a catalytic glutamate, caging the active site. Thus, Lyz(P1) and Lyz(103) define subclasses of SAR endolysins that differ in the nature of their inhibitory disulfide, and Lyz(103) is the first enzyme found to be regulated by disulfide bond caging of its active site.
journal_name
J Bacterioljournal_title
Journal of bacteriologyauthors
Kuty GF,Xu M,Struck DK,Summer EJ,Young Rdoi
10.1128/JB.00674-10subject
Has Abstractpub_date
2010-11-01 00:00:00pages
5682-7issue
21eissn
0021-9193issn
1098-5530pii
JB.00674-10journal_volume
192pub_type
杂志文章abstract::Escherichia coli suffered 95 to 100% lethality when exposed to 1.0 mM paraquat for 30 min at 37 degrees C in aerobic nutrient broth medium but did not lose viability when the exposure was done in Vogel Bonner or tryptic soy yeast extract medium. Paraquat was, however, bacteriostatic in all of these media. Salts, added...
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journal_title:Journal of bacteriology
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.151.3.1102-1108.1982
更新日期:1982-09-01 00:00:00
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journal_title:Journal of bacteriology
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pub_type: 杂志文章
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.128.1.372-381.1976
更新日期:1976-10-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.170.11.5027-5033.1988
更新日期:1988-11-01 00:00:00
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journal_title:Journal of bacteriology
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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更新日期:2011-05-01 00:00:00
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更新日期:1983-07-01 00:00:00
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更新日期:2003-09-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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更新日期:1977-02-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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更新日期:1984-04-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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更新日期:1981-04-01 00:00:00