Escherichia coli K-12 substr. MG1655 Protein: mechanosensitive channel YnaI

Gene: ynaI Accession Numbers: G6666 (EcoCyc), b1330, ECK1327

Regulation Summary Diagram: ?

Regulation summary diagram for ynaI

Subunit composition of mechanosensitive channel YnaI = [YnaI]7
         mechanosensitive channel YnaI monomer = YnaI

YnaI is a mechanosensitive channel of low conductance in E. coli K-12. In a strain lacking all seven mechanosensitive channels (MscL, MscS, MscK, MscM, YnaI, YbiO and YbdG), expression of ynaI from a multicopy plasmid results in stable channel openings in patch clamp experiments [Edwards12]. YnaI protects cells against hypoosmotic shock when highly overexpressed [Edwards12].

YnaI is predicted to have 5 transmembrane segments. YnaI forms homoheptameric channels [MarinoRamirez04, Edwards12].

YnaI is a member of the small mechanosensitive ion channel MscS family. YnaI has been identified as a segmentally variable gene containing highly variable regions scattered among highly conserved regions [Zheng04a]. Expression of ynaI increases in response to overexpression of the response regulator EvgA [Masuda02].

Locations: inner membrane

Map Position: [1,392,915 <- 1,393,946] (30.02 centisomes, 108°)
Length: 1032 bp / 343 aa

Molecular Weight of Polypeptide: 38.754 kD (from nucleotide sequence)

Unification Links: ASAP:ABE-0004462 , DIP:DIP-12740N , EchoBASE:EB3683 , EcoGene:EG13924 , EcoliWiki:b1330 , ModBase:P0AEB5 , OU-Microarray:b1330 , PortEco:ynaI , Protein Model Portal:P0AEB5 , RefSeq:NP_415846 , RegulonDB:G6666 , SMR:P0AEB5 , String:511145.b1330 , UniProt:P0AEB5

Relationship Links: InterPro:IN-FAMILY:IPR006685 , InterPro:IN-FAMILY:IPR006686 , InterPro:IN-FAMILY:IPR010920 , InterPro:IN-FAMILY:IPR011014 , InterPro:IN-FAMILY:IPR011066 , Pfam:IN-FAMILY:PF00924 , Prosite:IN-FAMILY:PS01246

In Paralogous Gene Group: 133 (3 members)

Gene-Reaction Schematic: ?

Gene-Reaction Schematic

GO Terms:

Biological Process: GO:0071470 - cellular response to osmotic stress Inferred from experiment [Edwards12]
GO:0006810 - transport Inferred by computational analysis [UniProtGOA11a]
GO:0006811 - ion transport Inferred by computational analysis [UniProtGOA11a, Zheng04a]
GO:0055085 - transmembrane transport Inferred by computational analysis [GOA01a]
Molecular Function: GO:0008381 - mechanically-gated ion channel activity Inferred by computational analysis Inferred from experiment [Edwards12, Zheng04a]
Cellular Component: GO:0005886 - plasma membrane Inferred from experiment Inferred by computational analysis [UniProtGOA11, UniProtGOA11a, DiazMejia09, Daley05]
GO:0005887 - integral component of plasma membrane Inferred by computational analysis [Edwards12]
GO:0016020 - membrane Inferred by computational analysis [UniProtGOA11a, GOA01a]
GO:0016021 - integral component of membrane Inferred by computational analysis [UniProtGOA11a]

MultiFun Terms: cell processes adaptations osmotic pressure
cell structure membrane
transport Channel-type Transporters

Essentiality data for ynaI knockouts: ?

Growth Medium Growth? T (°C) O2 pH Osm/L Growth Observations
LB enriched Yes 37 Aerobic 6.95   Yes [Gerdes03, Comment 1]
LB Lennox Yes 37 Aerobic 7   Yes [Baba06, Comment 2]
M9 medium with 1% glycerol Yes 37 Aerobic 7.2 0.35 Yes [Joyce06, Comment 3]
MOPS medium with 0.4% glucose Yes 37 Aerobic 7.2 0.22 Yes [Baba06, Comment 2]

Curated 31-Jul-2006 by Shearer A , SRI International
Curated 13-May-2008 by Johnson A , JCVI
Revised 09-Sep-2012 by Mackie A , Macquarie University
Last-Curated ? 09-Sep-2012 by Mackie A , Macquarie University

Sequence Features

Protein sequence of mechanosensitive channel YnaI monomer with features indicated

Feature Class Location Citations Comment
Transmembrane-Region 10 -> 30
UniProt: Helical;; Non-Experimental Qualifier: potential;
Transmembrane-Region 41 -> 61
UniProt: Helical;; Non-Experimental Qualifier: potential;
Transmembrane-Region 78 -> 98
UniProt: Helical;; Non-Experimental Qualifier: potential;
Transmembrane-Region 126 -> 146
UniProt: Helical;; Non-Experimental Qualifier: potential;
Transmembrane-Region 148 -> 168
UniProt: Helical;; Non-Experimental Qualifier: potential;

Gene Local Context (not to scale): ?

Gene local context diagram

Transcription Unit:

Transcription-unit diagram


Markus Krummenacker on Tue Oct 14, 1997:
Gene object created from Blattner lab Genbank (v. M52) entry.


Baba06: Baba T, Ara T, Hasegawa M, Takai Y, Okumura Y, Baba M, Datsenko KA, Tomita M, Wanner BL, Mori H (2006). "Construction of Escherichia coli K-12 in-frame, single-gene knockout mutants: the Keio collection." Mol Syst Biol 2;2006.0008. PMID: 16738554

Daley05: Daley DO, Rapp M, Granseth E, Melen K, Drew D, von Heijne G (2005). "Global topology analysis of the Escherichia coli inner membrane proteome." Science 308(5726);1321-3. PMID: 15919996

DiazMejia09: Diaz-Mejia JJ, Babu M, Emili A (2009). "Computational and experimental approaches to chart the Escherichia coli cell-envelope-associated proteome and interactome." FEMS Microbiol Rev 33(1);66-97. PMID: 19054114

Edwards12: Edwards MD, Black S, Rasmussen T, Rasmussen A, Stokes NR, Stephen TL, Miller S, Booth IR (2012). "Characterization of three novel mechanosensitive channel activities in Escherichia coli." Channels (Austin) 6(4);272-81. PMID: 22874652

Gerdes03: Gerdes SY, Scholle MD, Campbell JW, Balazsi G, Ravasz E, Daugherty MD, Somera AL, Kyrpides NC, Anderson I, Gelfand MS, Bhattacharya A, Kapatral V, D'Souza M, Baev MV, Grechkin Y, Mseeh F, Fonstein MY, Overbeek R, Barabasi AL, Oltvai ZN, Osterman AL (2003). "Experimental determination and system level analysis of essential genes in Escherichia coli MG1655." J Bacteriol 185(19);5673-84. PMID: 13129938

GOA01a: GOA, DDB, FB, MGI, ZFIN (2001). "Gene Ontology annotation through association of InterPro records with GO terms."

Joyce06: Joyce AR, Reed JL, White A, Edwards R, Osterman A, Baba T, Mori H, Lesely SA, Palsson BO, Agarwalla S (2006). "Experimental and computational assessment of conditionally essential genes in Escherichia coli." J Bacteriol 188(23);8259-71. PMID: 17012394

MarinoRamirez04: Marino-Ramirez L, Minor JL, Reading N, Hu JC (2004). "Identification and mapping of self-assembling protein domains encoded by the Escherichia coli K-12 genome by use of lambda repressor fusions." J Bacteriol 186(5);1311-9. PMID: 14973045

Masuda02: Masuda N, Church GM (2002). "Escherichia coli gene expression responsive to levels of the response regulator EvgA." J Bacteriol 184(22);6225-34. PMID: 12399493

UniProt10: UniProt Consortium (2010). "UniProt version 2010-07 released on 2010-06-15 00:00:00." Database.

UniProtGOA11: UniProt-GOA (2011). "Gene Ontology annotation based on the manual assignment of UniProtKB Subcellular Location terms in UniProtKB/Swiss-Prot entries."

UniProtGOA11a: UniProt-GOA (2011). "Gene Ontology annotation based on manual assignment of UniProtKB keywords in UniProtKB/Swiss-Prot entries."

Zheng04a: Zheng Y, Roberts RJ, Kasif S (2004). "Segmentally variable genes: a new perspective on adaptation." PLoS Biol 2(4);E81. PMID: 15094797

Other References Related to Gene Regulation

MendozaVargas09: Mendoza-Vargas A, Olvera L, Olvera M, Grande R, Vega-Alvarado L, Taboada B, Jimenez-Jacinto V, Salgado H, Juarez K, Contreras-Moreira B, Huerta AM, Collado-Vides J, Morett E (2009). "Genome-wide identification of transcription start sites, promoters and transcription factor binding sites in E. coli." PLoS One 4(10);e7526. PMID: 19838305

Report Errors or Provide Feedback
Please cite the following article in publications resulting from the use of EcoCyc: Nucleic Acids Research 41:D605-12 2013
Page generated by SRI International Pathway Tools version 19.0 on Wed Oct 7, 2015, biocyc13.