Download Instant Notes in Biochemistry by Hames D., Hooper N. PDF

By Hames D., Hooper N.

An enormous replace of the hugely well known moment variation, with alterations within the content material and employer that mirror advances within the topic. As with the 1st versions, the 3rd variation of quick Notes in Biochemistry offers the basic proof of biochemistry with special motives and transparent illustrations. it's also new and multiplied subject matters reminiscent of cytoskeleton, molecular cars, bioimaging, biomembranes, phone signaling, protein constitution and enzymes rules.

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54 nm Position of polypeptide backbone consisting of Cα and peptide bond C– N atoms R (b) H N C C H R1 O H H O N C C R2 H N C C H R3 O Hydrogen bond H H O N C C R4 R R (c) H N C C H R5 O R R R R R R Fig. 5. The folding of the polypeptide chain into an α-helix. (a) Model of an α-helix with only the Cα atoms along the backbone shown; (b) in the α-helix the CO group of residue n is hydrogen bonded to the NH group on residue (n + 4); (c) cross-sectional view of an α-helix showing the positions of the side-chains (R groups) of the amino acids on the outside of the helix.

Those amino acids with an ionizable side-chain (Asp, Glu, Arg, Lys, His, Cys, Tyr) have an additional acid–base group. The titration curve of Gly is shown in Fig. 2a. e. high hydrogen ion concentration) both the amino group and the carboxyl group are fully protonated so that the amino acid is in the cationic form H3NϩCH2COOH (Fig. 2b). g. 6). The pH at which Gly has no net charge is termed its isoelectric point, pI. 8 (Table 1). 8, respectively. 0, is ionized within the physiological pH range (pH 6–8).

To determine whether two proteins interact inside the cell, the proteins are first tagged with two different variants of GFP. (a) In this example, protein X is coupled to cyan fluorescent protein (CFP), which is excited at 440 nm and emits blue light at 490 nm, while protein Y is coupled to yellow fluorescent protein (YFP), which is excited at 490 nm and emits yellow light at 527 nm. (b) If protein X and Y do not interact, illuminating the sample at 440 nm yields fluorescence at 490 nm from CFP only.

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