Hi
thanks for the reply:
As samuel suggested I used the following link
ftp://ftp.ebi.ac.uk/pub/databases/IPI/current/ipi.HUMAN.xrefs.gz.
For the once I didnot find,I used the following code

Though I still dont get 1:1 mapping, I got the entrez and the gene
symbol.The ipi_test file contains the list of IPI that I want to convert.

code:
>source('http://bioconductor.org/biocLite.R')
> biocLite("biomaRt")
>library("biomaRt")
 >ensembl = useMart("ensembl", dataset = "hsapiens_gene_ensembl")
>ipi=scan("ipi_test.txt",what =character(),sep='\n',quote="")
>getBM(attributes =
c("ipi","entrezgene","hgnc_symbol"),filters="ipi",values=ipi,mart = ensembl)
>write.table(ipi_entrez,"ipi_entrez_test.txt",sep='\t')

I am still not getting a few.Is there any other method or should I think
that those IPI numbers dont have corresponding gene symbols?
Thanks,
Viritha

On Wed, Feb 16, 2011 at 12:23 PM, Manca Marco (PATH) <
m.manca@maastrichtuniversity.nl> wrote:

>
>
> Hi Viritha,
>
> I have found this old answer to a similar question and I think it should
> still apply:
>
> <<
>
> Not sure that it is this easy. The IPI are protein identifiers. GO
> categories classify genes. Neither the mapping from protein to gene or
> gene to GO category is 1:1. GO categories form a hierarchy. So there are
> significant decisions to be made in representing IPI identifiers in a
> pie chart of GO terms.
>
> Bioconductor maintains 'org' and 'GO' database packages that provide the
> necessary link between IPI protein ids and GO gene ontology categories,
> via ENTREZ gene ids. Code might look like
>
>  ## once only, to install packages
>  source('http://bioconductor.org/biocLite.R')
>  biocLite('org.Hs.eg.db', 'GO.db')
>
>  ## from IPI to ENTREZ id, not 1:1
>  library(org.Hs.eg.db)
>  ipi2eg = revmap(eapply(org.Hs.eg.db, names)) ## NOT 1:1 map
>
>  ## Assume ipiIds is, e.g., c('IPI00008860', 'IPI00019922')
>  egIds = revmap(ipi2eg[ipiIds])
>
>  ## get GO terms, also not 1:1
>  goIds = eapply(org.Hs.egGO[names(egIds)], names)
>
> You're still left with the problem of resolving multiple mappings and
> the hierarchical relationship between GO terms.
>
> Martin
>
> >>
>
>
> All the best, Marco
>
> --
> Marco Manca, MD
> University of Maastricht
> Faculty of Health, Medicine and Life Sciences (FHML)
> Cardiovascular Research Institute (CARIM)
>
> Mailing address: PO Box 616, 6200 MD Maastricht (The Netherlands)
> Visiting address: Experimental Vascular Pathology group, Dept of Pathology
> - Room5.08,  Maastricht University Medical Center, P. Debyelaan 25, 6229  HX
> Maastricht
>
> E-mail: m.manca@maastrichtuniversity.nl
> Office telephone: +31(0)433874633
> Personal mobile: +31(0)626441205
> Twitter: @markomanka
>
>
>
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> ________________________________________
> Da: bioconductor-bounces@r-project.org [bioconductor-bounces@r-project.org]
> per conto di viritha kaza [viritha.k@gmail.com]
> Inviato: mercoledė 16 febbraio 2011 18.15
> A: Bioconductor
> Oggetto: [BioC] IPI to entrez id
>
> Hi group,
> I would like to convert a list of 3000 IPI's to genesymbol and entrez id.
> eg : * *  *IPI00658210     *to 57599, WDR48.
> I wanted a 1:1 mapping.
> Could anyone suggest the function and the package which could help me in
> the
> process.
> Thank u in advance,
> Viritha
>
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