Multiple mRNA species for the precursor to an adenovirus-encoded glycoprotein: identification and structure of the signal sequence.

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Abstract
Early region 3 of the adenovirus type 2 genome encodes 3 proteins with MW of 16,000, 14,500 and 14,000 (E3/16, E3/14.5 and E3/14). The E3/16 protein is the precursor to the E3/19 glycoprotein and is around 1500 daltons larger than the unglycosylated E3/190 protein. The E3/14.5 and E3/14 proteins are structurally related to each other but different from E3/16. Three mRNA species were identified for E3/16; all have common 5'' ends with the same spliced region but with different 3'' ends. E3/14 was translated from a 13S mRNA with the same 5'' structure as the E3/16 mRNA but followed by a 2nd spliced region with a different 3'' end. A partial amino acid sequence was determined for E3/16 after radioactive labeling in vitro and this sequence can be aligned with a known DNA sequence. It contains a hydrophobics signal sequence, 2 presumptive glycosylation sites and a hydrophobic region close to the COOH terminus.