What's the largest prot. structure known?

[Siggi Engelbrecht]

I always thought the photosynthetic reaction centre was the biggest structure solved
so far (around 80 kDa). But if you are after single chain proteins this
doesn't count. If you go for heterooligomers also: The structure of the 
mitochondrial ATPase is coming  soon in Nature: 370 kDa, five subunits, 
three alpha, three beta, gamma, delta, epsilon. Not all subunits were seen 
properly, gamma only in part.