Stopped-flow x-ray scattering: the dissociation of aspartate transcarbamylase.
AUTOR(ES)
Moody, M F
RESUMO
A combination of stopped-flow and x-ray scattering techniques was used to study the dissociation of aspartate transcarbamylase (carbamoylphosphate:L-aspartate carbamoyltransferase, EC 2.1.3.2) with a 2:1 excess of p-chloromercuribenzenesulfonic acid (the ratio being calculated on a basis of reactive sites), in the presence and absence of the transition state analogue N-(phosphonacetyl)-L-aspartate. At 10 mg of protein per ml, the scattering curves allowed some details of the reaction to be followed with a time resolution down to 1 sec. The curves showed not only the dissociation of the enzyme complex but also the formation of the subunits. These results show that, with present facilities, x-ray scattering could be used to study dissociation or reassociation reactions with a time resolution of the order of 100 msec.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=349764Documentos Relacionados
- Ribosome formation from subunits studied by stopped-flow and Rayleigh light scattering
- Kinetics of the alkaline tetramer leads to dimer dissociation in liganded human hemoglobin: a laser light-scattering stopped-flow study.
- A Stopped-Flow Apparatus with Light-Scattering Detection and Its Application to Biochemical Reactions
- X-ray scattering by cybotactic nematic mesophases
- X-ray scattering from the superhelix in circular DNA.
