Module 1: Genome Engineering, Day 1
HaoSuperM13: Genome Re-engineering
|Gene||Location in Genome||Functions||Modifications|
|I||3196-4242||Assembly, forms bacterial membrane channels||Adding regulators may allow for control of channel production, adding other elements may make channels that can open or close based on certain properties of the surroundings|
|II||8268-831||Replication of DNA + strand||Would not change this gene too much as it could disrupt the whole replication process from the very beginning|
|III||1579-2853||Phage tail protein||Modifying this gene may render the phage useless as it may prevent the phage from exiting the hose cell. However, if it can be re-engineered to bind to proteins other than TolA, it may be a useful device for marking certain types of cells|
|IV||4220-5500||Assembly, forms channels in bacterial membrane||Same as gene I, perhaps deletion of one of these genes may provide information on how far the production of membrane channels may proceed|
|V||843-1106||Binds ssDNA to make protein for packaging||Would not change this gene too much unless want to examine effects on ssDNA versus dsDNA|
|VI||2856-3194||Phage tail protein, supplementation to p3||Altering this gene may have similar effects to altering gene III, which would allow for the examining of function/duty of p3 in infecting/exiting the hose cell|
|VII||1108-1209||Phage head protein||Fusing this gene with GFP may provide a targeting/marking protein helpful in observing phage/bacterial activity|
|VIII||1304-1522||Major phage coat protein, can adjust with size of genome||Altering protein affinity or allowing expression of certain proteins can allow the major coat protein to bind to objects, perhaps for marking or just for production of certain proteins|
|IX||1206-1304||Phage head protein||Same as gene VII|
|X||496-831||DNA replication||Similar to gene II, perhaps possible to control affinity for ssDNA or dsDNA so that more of one or the other may appear in a bacterial cell, this could be good or bad depending on whether we want more of the phage to be created and secreted or less|
|XI||3916-4242||Assembly, bacterial membrane, membrane channels||Same as gene I, IV|
M13’s closest evolutionary relatives are the bacteriophages Fd and F1, both of which are filamentous phages. They all have single stranded DNA (ssDNA), and their coat proteins may have slight differences, causing the phages to vary in surface charges. The differences in nucleotides only diverge within a 3% margin, though their restrictions sites are in different sequential placements, because they all originate from the bacteriophage family Inoviridae.
"BBa_M1307 is not a standard biological part and does not belong in the registry"
BBa_M1307 is the M13 genome with the additions of an origin of replication of the pACYC177 bacterial DNA sequence and the kanamycin resistance gene. According to the levels of abstraction defined in class, a ‘part’ can be only be a sequence of DNA that encodes for a biological function that may be utilized by a ‘device’ or ‘system’ to perform a specific task. Not only can BBa_M1307 perform many functions such as the ability to infect a host cell, replicate its genome, assemble proteins, resist kanamycin and exit a host cell without causing lysis, it itself is made up of several parts, and thus acts more like a ‘device’. If BBa_M1307 can be broken down and re-engineered into a new ‘device’, used for further analysis or just simply for parts, the modification may make it more acceptably classifiable as a ‘part’ rather than something farther up the abstraction ladder.