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Sarcolectin: complete purification for molecular cloning.

P H Jiang¹, F Chany-Fournier, C Chany

¹Université R.-Descartes, Paris V, Laboratoire des Interférons et de la Sarcolectine H440, France.

|September 24, 1999

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Sarcolectin (SCL), a vertebrate cell lectin, stimulates DNA synthesis and blocks interferon (IFN) action. Researchers purified SCL, identifying a 55 kDa protein as the active form, crucial for future molecular structure studies.

Area of Science:

Biochemistry
Cell Biology
Molecular Biology

Background:

Vertebrate cells contain lectins that initiate DNA synthesis.
Sarcolectin (SCL) inhibits interferon (IFN) action by blocking IFN-dependent protein synthesis.
This inhibition abolishes the IFN-induced antiviral state, potentially aiding viral replication.

Purpose of the Study:

To purify and identify the protein(s) responsible for SCL's biological functions.
To clarify the identity of sarcolectin and its role in cellular processes.
To establish a foundation for determining SCL's molecular structure via recombinant DNA technology.

Main Methods:

A two-step primary separation followed by a four-step final purification protocol was developed.
Purification was monitored using high-pressure liquid chromatography (HPLC) and SDS-PAGE electrophoresis.

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Protein identification was confirmed through Western blot analysis.

Main Results:

A major 65 kDa protein band and a minor 55 kDa protein band were initially identified.
The 55 kDa protein was confirmed as the active sarcolectin (SCL).
The 65 kDa band was determined to be SCL bound to albumin, indicating albumin's interference during purification.

Conclusions:

The minor 55 kDa protein is the functional sarcolectin (SCL).
The major 65 kDa band is an artifact of SCL binding to albumin.
Key biological functions, including DNA synthesis stimulation and cell agglutination, were retained in the purified 55 kDa SCL.