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Escherichia coli ribosomal protein L7/L12 dimers remain fully active after interchain crosslinking of the C-terminal domains in two orientations.

Abstract：

:Cysteine site-directed mutagenesis was used to create variants of Escherichia coli ribosomal protein L7/L12 that have single cysteine substitutions, at residues 63 or 89, located in different exposed loops in the structure of the globular C-terminal domain indicated by the crystallographic structure. That structure shows a possible dimer interaction in which the two sites of cysteine substitution appear to be too distant for disulfide bond formation. After mild oxidation in solution both of the overexpressed purified cysteine-substituted proteins formed interchain disulfide crosslinked dimers in high yield. Both crosslinked dimers were fully active in restoring activity in poly(U)-directed polyphenylalanine synthesis to ribosomal core particles depleted of wild-type L7/L12. These results show that the two C-terminal domains have independent mobility. The activity of dimeric L7/L12 does not require the independent movement of the two globular C-terminal domains in an L7/L12 dimer; moreover, it appears independent of their mutual orientation when joined by crosslinking at the two loops. A third variant with a cysteine substitution at residue 33 near the junction between the alpha-helical N-terminal domain and the flexible hinge was prepared and tested. This protein was active in the protein synthesis assay in the reduced state. Oxidation produced the interchain crosslinked dimer in high yield, but this crosslinked dimer was inactive in polyphenylalanine synthesis. The inactivation was due to the inability of the Cys33-Cys33 oxidized dimer to bind to the core particle.

journal_name

Proc Natl Acad Sci U S A

journal_title

Proceedings of the National Academy of Sciences of the United States of America

authors

Oleinikov AV,Jokhadze GG,Traut RR

doi

10.1073/pnas.90.21.9828

subject

Has Abstract

pub_date

1993-11-01 00:00:00

pages

9828-31

issue

21

eissn

0027-8424

issn

1091-6490

journal_volume

90

pub_type

杂志文章

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