. Extraction of membrane protein fraction by using Chemical method
The membrane protein fraction was isolated from other parts of cellular fractions by different speed
of centrifugation as shown in Figure 1. However, the amount of fractionated membrane proteins
was very low when compared to total amount of shrimp hemocytic proteins. The high amounts of
individual shrimps were used in this experiment. Moreover, there was no specific protein marker for
detection of shrimp membrane protein fraction. Therefore, this method is not proper for membrane
protein extraction in this work. The biotinylation method can solve these problems because this
membrane impermeable biotin reagent is specific for selective labeling of cell surface proteins.