Shlo/notebook
Week 2
6/27
Yesterday night I left some vectors & plasmids to ligate in the 37C incubator. Kevin took the vectors for nucleotide removal, and I speed Vac'd the plasmids.
- Reconstitution into 30uL of H2O per vector (two vectors total - OmpA1, OmpA2),
- split into two samples each (so 15uL total volume)
- PCR purified
- Eluted with 50uL nuclease-free H2O per tube
- prepared a gel using TBE
- prepared 5 lanes
- Lane 1: 10uL latter (1kB +)
- Lane 2: 1uL OmpA1 plasmid (diluted to 20uL total using H2O)
- Lane 3: 3uL OmpA1 plasmid (diluted to 20)
- Lane 4: 1uL OmpA2 plasmid (diluted to 20)
- Lane 5: 3uL OmpA2 plasmid (diluted to 20)
The gel was rul at 130V for 45 minutes.
4 tubes total should remain: 2 tubes of each type of plasmid. 2 tubes should have 49uL left (labeled "1"), 2 tubes should have 47uL left (labeled "2")
Week 1
Doing some reading on Fec now. Really brief notes and some of the more interesting readings follow.
Fec genes encode proteins essential for ferric citrate transport in e.coliK12.
FecA is an outer membrane protein
=N-proximal 79-residue extension: deletion of this extension abolishes induction by ferric citrate but retains feric citrate transport: Kim et al, Transcription induction of the ferric citrate transport genes via the N-terminus of the FecA outer membrane protein, the Ton system, and the electrochemical potential of the cytoplasmic membrane Kim article
Gene regulation by transmembrane signaling Some really nice info on structure of Fec and interactions with ferric citrate
Biocyc
- Nakajima H, Shimbara N, Shimonishi Y, Mimori T, Niwa S, and Saya H. Expression of random peptide fused to invasin on bacterial cell surface for selection of cell-targeting peptides. Gene. 2000 Dec 30;260(1-2):121-31. DOI:10.1016/s0378-1119(00)00461-3 |
- Vassylyev DG, Sekine S, Laptenko O, Lee J, Vassylyeva MN, Borukhov S, and Yokoyama S. Crystal structure of a bacterial RNA polymerase holoenzyme at 2.6 A resolution. Nature. 2002 Jun 13;417(6890):712-9. DOI:10.1038/nature752 |
NanoDrop results (6/20) performed by Ellenor and Stephanie:
(1.5 uL used out of a 30uL elution with nuclease free water)
S: 10.9 ng/uL
S2: 15.4 ng/uL
B: 59.1 ng/uL
B1: 25.1 ng/uL
Brainstorming for the two-component systems (really for my own use for now - not expected to be coherent)
Structural comparison of the PhoB and OmpR DNA binding/transactivation domains and the arrangement of PhoB molecules on the phosphate box
-NMR used to determine 3DE structure of PhoB DNA-binding/transactivation domain. Very similar to OmpR DNA-binding/transactivation domain, except for conformation of the long turn region of PhoB (interaction site for sigma subunit, rather than interaction with alpha subunit for OmpR)
Interdomain linkers of homologous response regulators determine their mechanism of action
Focuses on OmpR and PhoB and, as the title suggests, supports that phosphorylation of sites (particularly N-terminus of both proteins) improves affinity to bind DNA. Isolated C terminus of OmpR is insufficient to productively interact with RNA polymerase.
I've been told by some of the lab members that OmpR is an inner-membrane protein and therefore cannot be used for our assays. It seems that we'll have to find another protein ...
The phosphoryl transfer domain of UhpB interacts with the response regulator UhpA
UhpB = histidine kinase protein that controls production of sugar phosphate transporter UhpT
UhpA = response regulator; when phosphate is transferred from histidine to aspartate, ability of kinase to bind to target DNA sequences and to alter gene transcription is altered.
Major result: indication that phosphoryl, transfer-dimerization of UhpB participates in specific binding of UhpA, in control of autokinase activity, and dephosphorylation of P-UhpA
... So I found this paper on a search on PubMed for e coli outer membrane protein signaling dimerization. However, I've found that UhpA resides in the cytoplasm, whereas UhpB is an inner-membrane protein. Boo.
More thoughts: we could potentially try to target some of these inner-membrane proteins to the outer-membrane. I don't know if this is really feasible - while we can attach the appropriate signal sequence, I'm not sure the environment would allow for correct conformation and activity of said proteins.
