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dna

Capacitors of concealed genetic variability (Capacitance phenomenon)

Cryptic genetic variation (CGV) is invisible under normal conditions but fuel for evolution when circumstances change. In theory, CGV can represent a massive cache of adaptive potential or a pool of deleterious alleles in need of constant suppression. CGV emerges from both neutral and selective processes and it may inform how human populations respond to […]

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test tube

Need of two lysine (K) in the signal sequence of KDEL receptors

In the Golgi-ER retrograde pathway, sorting of membrane proteins occurs throughout the interaction of coat proteins with their cytoplasmic domains. A putative dilysine motif is present within the C-terminal domain (-6 to -7) of the KDEL receptor. This dilysine motif is required for interaction with coatomer (COPI is a coatomer, a protein complex that coats vesicles

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lab

Guide and passenger strand recognition by Argonaute protein

Argonaute protein is involved in RNAi, it recognizes and binds to siRNA duplex, cleaves and removes passenger strand, and allows guide strand to scan target mRNA. Argonaute (AGO) proteins have 4 discrete folding units: N-terminal: Acts as a wedge. PAZ domain: contains a binding pocket, anchors the 2-nucleotide 3′ overhang of siRNA like duplex. MID

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biotech dna

Discrimination of dNTPs and rNTPs by DNA polymerase and RNA polymerase

Intracellular ratio of rNTP/ dNTP is very high. DNA polymerase: It actively discriminates against rNTPs via a “STERIC gate” formed by the Glu and Phe side chains, which excludes 2′-OH group of rNTP. But because of high concentration of rNTPs, they still get incorporated into DNA by Pol δ and ε. rNTP incorporation rate is

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black dna

Dark DNA

Before questioning Dark DNA existence, one should understand what is Dark DNA? We call the hidden sequence “dark DNA” as a reference to dark matter, the stuff that we think makes up about 25% of the universe but that we can’t actually detect. So the dark DNA is sequence which is present in genome; but

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