It's just a standard walking bassline in a I-IV-V format, in E I believe, so the chords would be
[b]E[/b] (four bars)
[b]A [/b](two bars)
[b]E[/b] (two bars)
[b]B[/b] (one bar)
[b]A[/b] (one bar)
[b]E[/b] (one bar)
[b]B[/b] (one bar)
As for the walking part, it's just basically major arpeggios in the traditional blues format, which in tab form would be something like this -
[b]E[/b][font="Courier New"]
G|-----------6-|
D|-----6--9----|
A|--7----------|
E|-------------|[/font]
...and similar structures for the other chords in the sequence.
To string the arpeggios together, just throw in a few passing tones in between, walking chromatically up and down from chord to chord.
And there you have a simple introduction to blues bass playing in general!
Apologies if I haven't been very clear, it's late at night! Hopefully this will go some way to helping you, and the rest of the theory heads will be along soon
Danny