4en1
From Proteopedia
The 1.62A structure of a FRET-optimized Cerulean Fluorescent Protein
Function
[GFP_AEQVI] Energy-transfer acceptor. Its role is to transduce the blue chemiluminescence of the protein aequorin into green fluorescent light by energy transfer. Fluoresces in vivo upon receiving energy from the Ca(2+)-activated photoprotein aequorin.
About this Structure
4en1 is a 2 chain structure with sequence from Aequorea victoria. Full crystallographic information is available from OCA.