Etymology:
< prot- (in protein n.) + -o- connective + -mer comb. form2.
Biochem.
Each of the protein subunits of which an oligomeric protein is built up. (OED)
"To our knowledge, the protomer of ribulose bisphosphate carboxylase from Rhodospirirum rubrum (55 kDa) is probably the largest molecule for which GroEL-mediated folding shows strict GroES dependence, an indication of folding in the cis-cavity."
- Chisa Sakikawa, Hideki Taguchi, Yoshishide Makino, and Masasuke Yoshida, "On the maximum size of proteins to stay and fold in the cavity of GroEL underneath GroES", The Journal of Biological Chemistry 274:21251 (1999)
...And we can't just say "monomer" because then someone might think that the monomer had a physiological function?
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