ArticleThe Journal of biological chemistry2011
An early event in the transport mechanism of LacY protein: interaction between helices V and I.
Article in The Journal of biological chemistry, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
10 citing papers in PubMed, 17 citations in OpenAlex.
- Role of Conserved Gly-Gly Pairs on the Periplasmic Side of LacY.Biochemistry · 2016Article
- Substrate-induced changes in the structural properties of LacY.Proceedings of the National Academy of Sciences of the United States of America · 2014Article
- Flexible gates generate occluded intermediates in the transport cycle of LacY.Journal of molecular biology · 2014Article
- Protonation drives the conformational switch in the multidrug transporter LmrP.Nature chemical biology · 2014Article
- Evolutionary mix-and-match with MFS transporters II.Proceedings of the National Academy of Sciences of the United States of America · 2013Article
- The periplasmic cavity of LacY mutant Cys154→Gly: how open is open?Biochemistry · 2013Article
- Apo-intermediate in the transport cycle of lactose permease (LacY).Proceedings of the National Academy of Sciences of the United States of America · 2012Article
- Manipulating the drug/proton antiport stoichiometry of the secondary multidrug transporter MdfA.Proceedings of the National Academy of Sciences of the United States of America · 2012Article
- Identifying functionally important conformational changes in proteins: activation of the yeast α-factor receptor Ste2p.Journal of molecular biology · 2012Article
- Lactose permease and the alternating access mechanism.Biochemistry · 2011Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
5 authors at 1 institution in 1 country.
Funding
Abstract
Helix V in LacY, which abuts and crosses helix I in the N-terminal helix bundle of LacY, contains Arg(144) and Trp(151), two residues that play direct roles in sugar recognition and binding, as well as Cys(154), which is important for conformational flexibility. In this study, paired Cys replacement mutants in helices V and I were strategically constructed with tandem factor Xa protease cleavage sites in the loop between the two helices to test cross-linking. None of the mutants form disulfides spontaneously; however, three mutants (Pro(28) → Cys/Cys(154), Pro(28) → Cys/Val(158) → Cys, and Phe(29) → Cys/Val(158) → Cys) exhibit cross-linking after treatment with copper/1,10-phenanthroline (Cu/Ph) or 1,1-methanediyl bismethanethiosulfonate ((MTS)(2)-1), 3-4 Å), and cross-linking is quantitative in the presence of ligand. Remarkably, with one mutant, complete cross-linking with (MTS)(2)-1 has no effect on lactose transport, whereas quantitative disulfide cross-linking catalyzed by Cu/Ph markedly inhibits transport activity. The findings are consistant with a number of previous conclusions suggesting that sugar binding to LacY causes a localized scissors-like movement between helices V and I near the point where the two helices cross in the middle of the membrane. This ligand-induced movement may act to initiate the global conformational change resulting from sugar binding.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.