a tool to transform any protein GI-number to the GI-number of its transcript, mRNA

Question

[natasha.sernova]

Dear ALL,

I am looking for a tool to transform any protein GI-number to the GI-number of its transcript, mRNA. I am not really sure that the approach exists, I just hope it does.

There is the following example in e-utils for EFetch: http://www.ncbi.nlm.nih.gov/books/NBK25499/#chapter4.EFetch

Sequences

Fetch FASTA for a transcript and its protein product (GIs 312836839 and 34577063)

http://eutils.ncbi.nlm.nih.gov/entrez/eutils/efetch.fcgi?db=sequences&id=312836839,34577063&rettype=fasta&retmode=text

But where and how is it possible to find both GI-numbers for any protein? I am especially interested in prokaryotic proteins. I hope something easier than NCBI-file scanning exists. Thank you very much for any hint!

Sincerely yours,
Natasha

Answer 1

[natasha.sernova]

The question is discussed in detail in eutilities COOKBOOK, so it's just a repetition.

http://www.bioperl.org/wiki/HOWTO:EUtilities_Cookbook