DNA Structure Of Hepatitis B
The genome of hepatitis B is made of circular DNA, but it is unusual because the DNA is not completely double stranded. One end is linked to the DNA polymerase of the virus. The genome is composed of nucleotides 3020 to 3320 (for the longest strand) and nucleotides 1700 to 2800 (for the shortest strand) [9]. The party wrapped in a bad way (not coding), is complementary to the viral mRNA. The viral DNA is found in the nucleus shortly after infection of the cell. Part of double-stranded DNA is made fully double stranded by matching strand (+) and the elimination of a protein molecule strand (-) and a short sequence of RNA from the strand (+ ). noncoding bases withdraw from the end of the strand (-) and the strands are paired. There are four known coding genes in the genome, they are called C, X, P and S. The core protein is encoded by the C gene (HBcAg), and its start codon is preceded by another codon upstream of formula AUG that initiates the production of the precore protein. HBeAg is produced by proteolytic processing of pre-protein core. DNA polymerase is encoded by genes of P. The S gene is the gene that encodes the surface antigen (HBsAg). The HBsAg gene is a long sequence of nucleotides coding, but which contains three sets of codons “home” (ATG) that divide the gene into three sections, pre-S1, pre-S2, and S. Due to the multiple start codons, is formed of three polypeptides of different sizes, large, medium and small (pre-S1 + pre-S2 + S, pre-S2 + S, or S) [10]. The function of the protein encoded by the gene X is not fully elucidated
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