As demonstrated in matrix permeability studies, the improved formation of covalent cross-linkages imposed by lysine facilitated construction of stronger cross-linking structures.
In the first run, we imposed a K48-diUb linkage in combination with the ambiguous interaction restraints (AIRs) defined from the CSP data.
The interaction between two chain elements (amino acids) consists of two parts: a short-ranged direct interaction, such as an electrostatic, hydrophobic or hydrogen bonding interaction between two side chains, and a longer range indirect interaction imposed by the covalent linkage between the two amino acid residues.
Limits on the optimality of the evolutionary process may be imposed by founder effects, linkage disequilibrium, allometry, pleiotropy, the archetype (the genetic prototype, i.e., the genetic material available at a site that fuels the evolutionary process), and compensatory trade-offs among traits (Harper 1982).
Three different three-body (two Ub molecules and Josephin) docking runs were performed to test the ability of K48 and K63 linked diUb to interact with Josephin: K48 or K63 linkages were imposed in two of them.
Using NMR we modeled the structure of diUb/Josephin complexes and showed that linkage preferences are imposed by the topology of the two binding sites.
In a third run, ambiguous linkage restraints were imposed to both K48 and K63 to see which one would be preferentially selected during docking.
In case of discrepancy in the alignment of the two linkage groups, we imposed the marker order from one parent as a fixed one for the other one and vice-versa.
Many IBD and linkage analyses make use of only ~10,000 SNPs due to the constraints of linkage equilibrium that are imposed to satisfy the first-order Markov models that underpin most of these methods.
However, the statistical significance between familial longevity and the Alzheimer's disease genetic risk score was lost when a more stringent linkage disequilibrium threshold was imposed to select independent genetic variants.
