1980
DOI: 10.1016/s0006-3495(80)84991-5
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Individual breathing reactions measured in hemoglobin by hydrogen exchange methods

Abstract: Protein hydrogen exchange is generally believed to register some aspects of internal protein dynamics, but the kind of motion at work is not clear. Experiments are being done to identify the determinants of protein hydrogen exchange and to distinguish between local unfolding and accessibility-penetration mechanisms. Results with small molecules, polynucleotides, and proteins demonstrate that solvent accessibility is by no means sufficient for fast exchange. H-exchange slowing is quite generally connected with … Show more

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Cited by 93 publications
(65 citation statements)
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“…Selectivity and accuracy increase with the rate difference, i.e., with the importance of the structure change, and decrease to zero as the rate difference disappears. A fragment separation method can then identify the positions of the selectively labeled allosterically sensitive sites at medium resolution (6)(7)(8)(9). Samples taken after different exchange-out times are plunged into slow HX conditions (pH Ϸ2.5, 0°C) and quickly fragmented with acid protease.…”
Section: Methodsmentioning
confidence: 99%
See 1 more Smart Citation
“…Selectivity and accuracy increase with the rate difference, i.e., with the importance of the structure change, and decrease to zero as the rate difference disappears. A fragment separation method can then identify the positions of the selectively labeled allosterically sensitive sites at medium resolution (6)(7)(8)(9). Samples taken after different exchange-out times are plunged into slow HX conditions (pH Ϸ2.5, 0°C) and quickly fragmented with acid protease.…”
Section: Methodsmentioning
confidence: 99%
“…Earlier work (5,6) developed a ''functional-labeling'' approach that can selectively label, by hydrogen-tritium (H-T) or hydrogen-deuterium (H-D) exchange, just those sites that change in any functional process. In favorable cases, the label can then be located at medium resolution by a proteolytic fragmentation method in which the fragments are quickly produced and then separated by HPLC under conditions where the loss of isotopic label is slow (6)(7)(8)(9).…”
mentioning
confidence: 99%
“…Table.2). The highly selective nature of hydrogen bond cleavage observed for these exchange paths is in contrast to proposedimechanisms that involve unfolding for which cooperative breaking of adjacent hydrogen bonds is likely to be important (1,5).…”
mentioning
confidence: 74%
“…Given (1)(2)(3)(4). However, there is still much uncertainty concerning a molecular interpretation of the experimental results (5)(6)(7)(8)(9). Attention is currently focused on two models for hydrogen exchange.…”
mentioning
confidence: 99%
“…The local unfolding model (21,22) is one of the mechanisms by which the buried amide hydrogens can exchange. Two types of fluctuations can be envisioned.…”
Section: Correlated Motions In Ssimentioning
confidence: 99%