Bacterial ice-nucleation proteins

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Bacterial ice-nucleation proteins octamer repeat
Symbol Ice_nucleatn
Pfam PF00818
InterPro IPR000258

Bacterial ice-nucleation proteins is a family of proteins that enable Gram-negative bacteria to promote nucleation of ice at relatively high temperatures (above -5C).[1][2] These proteins are localised at the outer membrane surface and can cause frost damage to many plants. The primary structure of the proteins contains a highly repetitive domain that dominates the sequence. The domain comprises a number of 48-residue repeats, which themselves contain 3 blocks of 16 residues, the first 8 of which are identical. It is thought that the repetitive domain may be responsible for aligning water molecules in the seed crystal.

            /              / |              | \              \
           AGYGSTxTagxxssli  AGYGSTxTagxxsxlt  AGYGSTxTaqxxsxlt
           [16.residues...]  [16.residues...]  [16.residues...]

See also[edit]


  1. ^ Wolber PK, Green RL (1990). "Detection of bacteria by transduction of ice nucleation genes". Trends Biotechnol. 8 (10): 276–279. PMID 1366726. doi:10.1016/0167-7799(90)90195-4. 
  2. ^ Gurian-Sherman D, Lindow SE (1993). "Bacterial ice nucleation: significance and molecular basis". FASEB J. 7 (14): 1338–1343. PMID 8224607. 

This article incorporates text from the public domain Pfam and InterPro IPR000258