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Title: Isolation and Characterization of Skin-type, Type I Antifreeze Polypeptides from the Longhorn Sculpin, Myoxocephalus octodecemspinosus
Authors: Low, W.-K.
Lin, Q.
Stathakis, C.
Miao, M.
Fletcher, G.L.
Hew, C.L. 
Issue Date: 13-Apr-2001
Source: Low, W.-K., Lin, Q., Stathakis, C., Miao, M., Fletcher, G.L., Hew, C.L. (2001-04-13). Isolation and Characterization of Skin-type, Type I Antifreeze Polypeptides from the Longhorn Sculpin, Myoxocephalus octodecemspinosus. Journal of Biological Chemistry 276 (15) : 11582-11589. ScholarBank@NUS Repository.
Abstract: The antifreeze polypeptides (AFPs) are found in several marine fish and have been grouped into four distinct biochemical classes (type I-IV). Recently, the new subclass of skin-type, type I AFPs that are produced intracellularly as mature polypeptides have been identified in the winter flounder (Pleuronectes americanus) and the shorthorn sculpin (Myoxocephalus scorpius). This study demonstrates the presence of skin-type AFPs in the longhorn sculpin (Myoxocephalus octodecemspinosus), which produces type IV serum AFPs. Using polymerase chain reaction-based methods, a clone that encoded for a type I AFP was identified. The clone lacked a signal sequence, indicating that the mature polypeptide is produced in the cytosol. A recombinant protein was produced in Escherichia coli and antifreeze activity was characterized. Four individual Ala-rich polypeptides with antifreeze activity were isolated from the skin tissue. One polypeptide was completely sequenced by tandem MS. This study provides the first evidence of a fish species that produces two different biochemical classes of antifreeze proteins (type I and type IV), and enforces the notion that skin-type AFPs are a widespread biological phenomenon in fish.
Source Title: Journal of Biological Chemistry
ISSN: 00219258
DOI: 10.1074/jbc.M009293200
Appears in Collections:Staff Publications

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