当前位置： SCI文献检索 > MOLECULAR BIOLOGY REPORTS期刊下所有文献 > Cofactor analogue-induced chemical reactivation of endonuclease activity in a DNA cleavage/methylation deficient TspGWI N₄₇₃A variant in the NPPY motif.

Cofactor analogue-induced chemical reactivation of endonuclease activity in a DNA cleavage/methylation deficient TspGWI N₄₇₃A variant in the NPPY motif.

Abstract：

:We reported previously that TspGWI, a prototype enzyme of a new Thermus sp. family of restriction endonucleases-methyltransferases (REases-MTases), undergoes the novel phenomenon of sinefungin (SIN)-caused specificity transition. Here we investigated mutant TspGWI N473A, containing a single amino acid (aa) substitution in the NPPY motif of the MTase. Even though the aa substitution is located within the MTase polypeptide segment, DNA cleavage and modification are almost completely abolished, indicating that the REase and MTase are intertwined. Remarkably, the TspGWI N473A REase functionality can be completely reconstituted by the addition of SIN. We hypothesize that SIN binds specifically to the enzyme and restores the DNA cleavage-competent protein tertiary structure. This indicates the significant role of allosteric effectors in DNA cleavage in Thermus sp. enzymes. This is the first case of REase mutation suppression by an S-adenosylmethionine (SAM) cofactor analogue. Moreover, the TspGWI N473A clone strongly affects E. coli division control, acting as a 'selfish gene'. The mutant lacks the competing MTase activity and therefore might be useful for applications in DNA manipulation. Here we present a case study of a novel strategy for REase activity/specificity alteration by a single aa substitution, based on the bioinformatic analysis of active motif locations, combining (a) aa sequence engineering (b) the alteration of protein enzymatic properties, and (c) the use of cofactor-analogue cleavage reconstitution and stimulation.

journal_name

Mol Biol Rep

journal_title

Molecular biology reports

authors

Zylicz-Stachula A,Jeżewska-Frąckowiak J,Skowron PM

doi

10.1007/s11033-014-3085-x

subject

Has Abstract

pub_date

2014-01-01 00:00:00

pages

2313-23

issue

4

eissn

0301-4851

issn

1573-4978

journal_volume

41

pub_type

杂志文章

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