View source for Part:pSB4A3

__NOTOC__
<partinfo>pSB4A3 short</partinfo>

pSB4A3-1 is a low copy plasmid with ampicillin resistance. It has a repA pSC101-derived replication origin, and thus can be co-expressed in the same host cell as Biobrick plasmids with the sufficiently dissimilar pMB1 origin (see [http://openwetware.org/wiki/Vectors#Escherichia%20coli OpenWetware's documentation for more information]). (Copy number ~10-12, Lutz and Bujard, 1997.)

pSB4A3 has a terminator upstream of its MCS, which is oriented to prevent transcription from *inside* the MCS from reading out into any DNA outside the MCS.The orientation of the pBLA promoter driving the AmpR gene is such that relatively little transcription should be coming into the MCS from upstream.  A second terminator (E.coli His operon-derived) is downstream of the MCS, again insulating the vector from transcription reading out of the MCS. Ideally, future versions of standard biobrick vectors would have terminators bracketing the MCS that were 100% efficient in terminating transcription both into and out of the MCS region.


===Usage and Biology===

*Primers for these Biobrick vectors can be found in [[Part:BBa_G00100]] (aka VF2) and [[Part:BBa_G00101]] (aka. VR)
*Annotated [http://www.biology.utah.edu/jorgensen/wayned/ape/ APE] file for [https://static.igem.org/mediawiki/parts/d/d0/PsB4A3.ogg pSB4A3] [[Image:PSB4A3 plasmid map.jpg|thumb|center|Plasmid map of psB4A3]]

<span class='h3bb'>Sequence and Features</span>
<partinfo>pSB4A3 SequenceAndFeatures</partinfo>


<!-- Uncomment this to enable Functional Parameter display 
===Functional Parameters===
<partinfo>pSB4A3 parameters</partinfo>
<!-- -->