Help:BioBrick Prefix and Suffix

Basic Information

For more information about how the prefix and suffix were determined and the special case of coding regions, see Assembly:RBS-CDS_issues.

Part Sequence

The DNA sequence for parts in the Registry starts with the first base of the part itself and ends with its last base. For example, a protein coding sequence is like this "ATG----------TAATAA". The sequence in the Registry does not include any bases of the BioBrick Prefix or Suffix.

Plasmid Backbones and primers or tags that explicitly specify prefix or suffix bases are exceptions to this rule.

BioBrick Prefix

The standard BioBrick prefix depends on the part that follows it.

If the following part is a coding sequence or any other part that starts "ATG", the BioBrick prefix is:	gaattcgcggccgcttctag
Otherwise, the BioBrick prefix is:	gaattcgcggccgcttctagag

BioBrick Suffix

The standard BioBrick suffix is always:

tactagtagcggccgctgcag

BioBrick Scar

When BioBricks with these prefix and suffix sequencees are assembled, there is a "scar" between these parts.

If the second part starts "AT", the scar is:	tactag
Otherwise, the scar is:	tactagag

BioBrick Restriction Enzyme Cut Sites

Prefix		Suffix
EcoRI	XbaI	SpeI	PstI
(g^aatt c)gcggccgct	(t^ctag a)g	t(a^ctag t)agcggccg	(c tgca^g)
(c ttaa^g)cgccggcga	(a gatc^t)c	a(t gatc^a)tcgccggc	(g^acgt c)

Footnotes 1. If you want to use your protein part with BioScaffold parts [1] to do things like directly make protein fusions from your part [http://openwetware.org/wiki/The_BioBricks_Foundation:BBFRFC15] in the future, then you should make a version of your part that has only one stop codon "ATG----------TAA" instead of two. Since the BioBrick scar that directly follows your part in assemblies also codes for a stop codon, you have the potential to get the same double stop effect even without direct addition of two stop codons after the protein coding region if you are careful to make sure another part always follows your protein coding part.