PAN domain

PAN_1

solution structure of a pan module from eimeria tenella
Identifiers
Symbol PAN_1
Pfam PF00024
Pfam clan CL0168
InterPro IPR003014
PROSITE PDOC00376
SCOP 1bht
SUPERFAMILY 1bht

PAN domains have significant functional versatility fulfilling diverse biological roles by mediating protein-protein and protein-carbohydrate interactions.[1] These domains contain a hair-pin loop like structure, similar to that found in knottins but with a different pattern of disulfide bonds.

It has been shown that the N-terminal domains of members of the plasminogen/hepatocyte growth factor family, the apple domains of the plasma prekallikrein/coagulation factor XI family, and domains of various nematode proteins belong to the same module superfamily, the PAN module.[1] The PAN domain contains a conserved core of three disulfide bridges. In some members of the family there is an additional fourth disulfide bridge that links the N- and C-termini of the domain.

The apple domain, as well as other examples of the PAN domain, consists of 7 β-strands that fold into a curved antiparallel sheet cradling an α-helix. Two disulfide bonds lock the helix onto the central β4 and β5 strands, whereas a third connects the N- and C-termini of the domain. In the apple domain, the β4-β5 loop and β5-β6 crossover loop generate a small pocket on the opposite side of the sheet from the α-helix.[2]

In native plasminogen the PAN domain is associated with five Kringle domains.[3] The interactions between the PAN domain and the kringles play a critical role in stabilising the quaternary complex of the native plasminogen;

References

  1. 1 2 Tordai H, Bányai L, Patthy L (November 1999). "The PAN module: the N-terminal domains of plasminogen and hepatocyte growth factor are homologous with the apple domains of the prekallikrein family and with a novel domain found in numerous nematode proteins". FEBS Lett. 461 (1-2): 63–7. doi:10.1016/s0014-5793(99)01416-7. PMID 10561497.
  2. Emsley J, McEwan PA, Gailani D (Apr 2010). "Structure and function of factor XI". Blood. 115 (13): 2569–77. doi:10.1182/blood-2009-09-199182. PMC 4828079Freely accessible. PMID 20110423.
  3. Xue Y, Bodin C, Olsson K (2012). "Crystal structure of the native plasminogen reveals an activation-resistant compact conformation.". J Thromb Haemost. 10 (7): 1385–96. doi:10.1111/j.1538-7836.2012.04765.x. PMID 22540246.

This article incorporates text from the public domain Pfam and InterPro IPR003014


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