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Prohead
II
-
350S
of
Phage
T4 -
Prohead II (350S) has a polyhedral capsid formed under the action of gp21 and possibly gp24. It contains mostly gp23* which is formed by the cleavage of gp23.
The difference in the sedimentation coefficients between proheads I and II corresponds to the reduction when gp23 is cleaved to gp23 *. Prohead II also contains gp22, which represents 4% of the total protein, and gp20. IPIIJ, and presumably PI and IPII, are also present. Proheads I and II do not contain any DNA
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