View source for 2py2

[[Image:2py2.gif|left|200px]]

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{{STRUCTURE_2py2|  PDB=2py2  |  SCENE=  }} 

'''Structure of Herring Type II Antifreeze Protein'''


==Overview==
In order to survive under extremely cold environments, many organisms produce antifreeze proteins (AFPs). AFPs inhibit the growth of ice crystals and protect organisms from freezing damage. Fish AFPs can be classified into five distinct types based on their structures. Here we report the structure of herring AFP (hAFP), a Ca(2+)-dependent fish type II AFP. It exhibits a fold similar to the C-type (Ca(2+)-dependent) lectins with unique ice-binding features. The 1.7 A crystal structure of hAFP with bound Ca(2+) and site-directed mutagenesis reveal an ice-binding site consisting of Thr96, Thr98 and Ca(2+)-coordinating residues Asp94 and Glu99, which initiate hAFP adsorption onto the [10-10] prism plane of the ice lattice. The hAFP-ice interaction is further strengthened by the bound Ca(2+) through the coordination with a water molecule of the ice lattice. This Ca(2+)-coordinated ice-binding mechanism is distinct from previously proposed mechanisms for other AFPs. However, phylogenetic analysis suggests that all type II AFPs evolved from the common ancestor and developed different ice-binding modes. We clarify the evolutionary relationship of type II AFPs to sugar-binding lectins.

==About this Structure==
2PY2 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Clupea_harengus Clupea harengus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2PY2 OCA]. 

==Reference==
Structure and evolutionary origin of Ca2+-dependent herring type II antifreeze protein., Liu Y, Li Z, Lin Q, Kosinski J, Seetharaman J, Bujnicki JM, Sivaraman J, Hew CL, PLoS ONE. 2007 Jun 20;2(6):e548. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/17579720 17579720]
[[Category: Clupea harengus]]
[[Category: Single protein]]
[[Category: Hew, C L.]]
[[Category: Li, Z.]]
[[Category: Lin, Q.]]
[[Category: Liu, Y.]]
[[Category: Seetharaman, J.]]
[[Category: Sivaraman, J.]]
[[Category: Type ii antifreeze protein]]
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