How Na+ activates thrombin--a review of the functional and structural data.
Review published in Biological chemistry (2008)
Abstract
Thrombin is the ultimate coagulation factor; it is the final protease generated in the blood coagulation cascade and is the effector of clot formation. Regulation of thrombin activity is thus of great relevance to determining the correct haemostatic balance, with dysregulation leading to bleeding or thrombosis. One of the most enigmatic and controversial regulators of thrombin activity is the monovalent cation Na+. When bound to Na+, thrombin adopts a 'fast' conformation which cleaves all procoagulant substrates more rapidly, and when free of Na+, thrombin reverts to a 'slow' state which preferentially activates the protein C anticoagulant pathway. Thus, Na+-binding allosterically modulates the activity of thrombin and helps determine the haemostatic balance. Over the last 30 years, there has been much research investigating the structural basis of thrombin allostery. Biochemical and mutagenesis studies established which regions and residues are involved in the slow-->fast conformational change, and recently several crystal structures of the putative slow form have been solved. In this article, the biochemical and crystallographic data are reviewed to see if we are any closer to understanding the conformational basis of the Na+ activation of thrombin.
Abstract sourced from PubMed (NCBI) for the cited record. See the original publication for the authoritative version.
Resumen
Thrombin is the ultimate coagulation factor; it is the final protease generated in the blood coagulation cascade and is the effector of clot formation. Regulation of thrombin activity is thus of great relevance to determining the correct haemostatic balance, with dysregulation leading to bleeding or thrombosis.
Por qué esto importa para la hirudoterapia
Esta revisión sintetiza más de 30 años de datos bioquímicos, de mutagénesis y cristalográficos sobre cómo el Na+ activa alostéricamente la trombina, describiendo la conformación 'rápida' unida a sodio que escinde preferentemente sustratos procoagulantes frente al estado 'lento' libre de sodio que favorece la activación de la proteína C. El artículo es indirectamente relevante para la hirudoterapia porque la trombina es el objetivo principal de la hirudina, el anticoagulante arquetípico del secretoma de la sanguijuela medicinal, y una comprensión exhaustiva de la regulación alostérica de la trombina contextualiza la base molecular del potente mecanismo inhibidor de la hirudina. No obstante, el resumen no menciona la hirudina, las sanguijuelas ni ningún componente del secretoma; el trabajo es puramente mecanicista/estructural sin dimensión terapéutica, y no se presentan datos directos relacionados con la sanguijuela.
Citación
How Na+ activates thrombin--a review of the functional and structural data.
Huntington · Biological chemistry, 2008
Contexto clínico relacionado
Explore cómo esta investigación se conecta con la práctica clínica
Añadido a la biblioteca ASH: May 28, 2026 · Última actualización del sitio: June 18, 2026