The Rpn11 subunit initiates assembly of a five-subunit lid module competent to integrate into pre-assembled base-20S core particle (CP), with subsequent recruitment of remaining lid subunits.
The "handle" in soluble fibronectin that cells use to initiate assembly, however, is located in the N-terminal F1 and F2 modules, not the RGD-containing F3 module recognized by α5β1 and several other integrins [11].
The differential degradation occurs to C3b (Figure 7A), but not to the anaphylatoxin C3a released, which could reduce the activation of C5 to C5b that initiates assembly of MAC.
CBF3 has orthologs only in a set of closely related budding yeast species but CBF3-CDEIII binding initiates assembly of a specialized domain of centromeric chromatin that is highly conserved throughout evolution [1] [3].
To initiate assembly, nPA K563C*AF555 and nPA K563C*AF647 were each diluted to 50 nM in 10 mM sodium cacodylate, 100 mM potassium chloride, 1 mM magnesium chloride, pH 7.4 either in the presence or absence of 100 nM LFN, 100 nM msANTXR2, or 100 nM dsANTXR2.
This observation suggests that multiple weak interactions between protofibrils are required to initiate assembly.
During the initiation of Pol II transcription, the general Pol II transcription factor IID TFIIDD) is the first general transcription factor that recognizes promoter sequences and initiates assembly of the preinitiation complex.
These POTRA domains are not essential for Sam50 to function, with the metaxin Sam35 serving as the 'receptor' for β-barrel substrates to bind the SAM complex and initiate assembly (Chan & Lithgow, 2008; Kutik et al., 2008).
Binding of TRAIL to DR4 and DR5 initiates assembly of the death-inducing signaling complex (DISC), which directly triggers caspase activation and, in some cells, activates the mitochondrial apoptotic pathway.
For the assembly experiment, 8.5 μM Cp149 dimer in 50 mM HEPES buffer (pH 7.5) was mixed with 50 mM HEPES buffer (pH 7.5) and 50 mM HEPES buffer (pH 7.5) with 2 M NaCl to achieve a final concentration of 0.9 μM Cp149 in 50 mM HEPES with 1 M NaCl to initiate assembly.
