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T-loop and D-loop are splayed apart showing how A58, normally buried in tRNA, becomes accessible for modification.
When incubating ERp90 Trx3 with DTT at 25°C under native conditions only a minor fraction of the Trx3 molecules became accessible for modification with AMS (Figure 4B, lane 4).
These sheets were readily accessible for modification or adding content when something new was learned.
In the basal state, the Ubl domain is bound to RING1 and Ser65 is poorly accessible for modification.
Such modification would need to be restricted to the 2′-OH, because the 3′-OH group is still accessible for modification by RNA ligase.
Consequently, the degree of modification of these two residues increased with time of incubation, suggesting that they are exposed and easily accessible for modification.
Similar(54)
However, the K of the B chain is still protected and not accessible for DSP modification.
Here we show that even if complex I is a constituent of the I + III2 + IV (S1) supercomplex, cysteine 39 is accessible for chemical modification in only the D-form.
These results suggest that, in the D-form of complex I, Cys-39 of the ND3 subunit is accessible for covalent modification independently of its possible association with complexes III and IV.
Using membrane-permeant [NEM (N-methylmaleimide)] and -impermeant [5,5′-dithiobis- 2-nitrobenzoic acid)] reagents, it was found that the critical cysteine residue accessible for chemical modification in the D-form was located at the matrix side of the enzyme [5,5′-dithiobis- 2-nitrobenzoic
The 39 kDa (NDUFA9) nuclear encoded accessory subunit was found to be associated with structural rearrangement during the A/D transition and therefore more accessible for chemical modification upon deactivation of complex I.
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