Proteins that cannot form biofilm?
Intracellular proteins cannot form biofilms. Additionally, many (but not all) extracellular proteins contain an N-terminal cleavable signal sequence.



Lory (1992) Determinants of extracellular protein secretion in Gram-negative bacteria. J Bacteriol 174: 3423-3428.
https://www.ncbi.nlm.nih.gov/pubmed/1592799

Schneewind &amp; Missiakas (2012) Protein secretion and surface display in Gram-positive bacteria. Philos Trans R Soc Lond B Biol Sci 367:1123-1139.
https://www.ncbi.nlm.nih.gov/pubmed/22411983