Physical mapping of herpes simplex virus-induced polypeptides.

Area of Science:

• Virology
• Molecular Biology
• Genetics

Background:

• Herpes simplex virus (HSV) genome organization is complex, with distinct long (L) and short (S) regions.
• Understanding the precise mapping of viral polypeptides is crucial for deciphering viral gene function and replication strategies.

Purpose of the Study:

• To map the positions of various herpes simplex virus type 1/type 2 intertypic recombinant-induced polypeptides within the viral genome.
• To correlate polypeptide map positions with crossover points in recombinant DNAs.
• To determine if specific functional groups of proteins are confined to either the L or S regions of the HSV genome.

Main Methods:

• Analysis of polypeptides induced by 29 HSV type 1/type 2 intertypic recombinants.
• Correlation of polypeptide data with crossover points in recombinant DNAs.
• Labeling of polypeptides using [35S]methionine, [32P]orthophosphate, and [14C]glucosamine.
• Integration of data with previously mapped immediate-early polypeptides.

Main Results:

• Map positions were deduced for 25 methionine-labeled, 11 phosphate-labeled, and 4 glucosamine-labeled polypeptides.
• Immediate-early, late, phosphorylated, and glycosylated proteins were found to map in both the L and S regions of the genome.
• This mapping extends previous findings for immediate-early polypeptides.

Conclusions:

• The functional organization of the herpes simplex virus genome does not restrict immediate-early, late, phosphorylated, or glycosylated proteins to either the L or S regions.
• Viral genes encoding these protein classes are distributed across both major genome segments.
• This suggests a more complex functional compartmentalization than previously assumed for these protein groups.