I am sorry, but I come to this thread late, and have lost the address of
Paul Yadlowsky who posed the original question. I have a partial answer
from the Iditis relational database of protein structure that I wrote whilst
working in Prof. Janet Thornton's lab. This is now commercialised by Oxford
Molecular, and I do work for them, so I beg forgiveness for posting this to
the main newsgroup rather than Paul direct.
I used a list of 99 non-homologous proteins containing 167 protein chains
(this being the list that I had available), and constructed a query to
return the number of chains with a given minimum number of residues. The results are
as follows:
Residues No. Chains Residues No. Chains Residues No. Chains
-------- ---------- -------- ---------- -------- ----------
25 163 175 80 325 37
50 155 200 74 350 29
75 143 225 67 375 24
100 130 250 59 400 19
125 107 275 50 425 16
150 95 300 46 450 14
475 0
I realise that this is only an indicative answer, but I hope that it helps.
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Steve Gardner
steve at gardner.demon.co.uk
