PolI's activities must be highly coordinated both temporally and spatially otherwise uncontrolled 5'-nuclease activity could attack a nick and produce extended gaps leading to potentially lethal double-strand breaks.
A few adjustments are made to reduce the impact of incomplete protein and mRNA-genome alignments: The alignments between the exons at the N- and C-terminals of the protein alignment are extended gap-free to the beginning and end of the respective exons.
Feeling they could take the joke further, they came up with the first annual Dime Glory Challenge last year, a one-day skate contest centered on the Joe Valdez Challenge, an event where skaters do tricks across an extending gap onto a narrow, 12-inch wide ledge.
Sequence identities were calculated using Lalign [19] with the default scoring matrix, an open gap penalty of −14 and an extend gap penalty of −4.
When a number flows through the "-" unit, an extending gap is applied.
Affine gap cost (or penalty) is a technique where the opening gap has different cost from an extending gap [ 38].
The BLOSUM-62 scoring matrix was used with identical open and extend gap penalties for each alignment.
The blastp algorithm used gapped alignment with the following parameter: expectation value 10-300), open gap (−1), extend gap (−1), threshold for extending hits (11) and word size (3).
Sequences were aligned using Clustal W, with a gap penalty of 10, an extend gap penalty of 0.2 and a delay of divergence of 30%.
