Carbonic anhydrase activators: Human isozyme II is strongly activated by oligopeptides incorporating the carboxyterminal sequence of the bicarbonate anion exchanger AE1
摘要:
Di-/tri- and especially tetrapeptides incorporating the sequence DADD present in the carboxyterminal region of the bicarbonate, chloride anion exchanger AE1 strongly activate human carbonic anhydrase (CA) isozyme II, whereas they act as more inefficient activators of isozymes I and IV. This discovery suggests that in the metabolon hCA II-AE1. the last protein plans a role both as a CA activator as well as a bicarbonate transporter. A synthesis of the tripeptide DAD and the tetrapeptide DADD is also presented together with the possible explanation why such highly acidic oligopeptides efficiently bind to hCA II but not to the closely related isozymes I and IV. (C) 2002 Elsevier Science Ltd. All rights reserved.
Carbonic anhydrase activators: Human isozyme II is strongly activated by oligopeptides incorporating the carboxyterminal sequence of the bicarbonate anion exchanger AE1
摘要:
Di-/tri- and especially tetrapeptides incorporating the sequence DADD present in the carboxyterminal region of the bicarbonate, chloride anion exchanger AE1 strongly activate human carbonic anhydrase (CA) isozyme II, whereas they act as more inefficient activators of isozymes I and IV. This discovery suggests that in the metabolon hCA II-AE1. the last protein plans a role both as a CA activator as well as a bicarbonate transporter. A synthesis of the tripeptide DAD and the tetrapeptide DADD is also presented together with the possible explanation why such highly acidic oligopeptides efficiently bind to hCA II but not to the closely related isozymes I and IV. (C) 2002 Elsevier Science Ltd. All rights reserved.
An expedient route for the reduction of carboxylic acids to alcohols employing 1-propanephosphonic acid cyclic anhydride as acid activator
作者:G. Nagendra、C. Madhu、T.M. Vishwanatha、Vommina V. Sureshbabu
DOI:10.1016/j.tetlet.2012.06.108
日期:2012.9
method for the synthesis of alcohols from the corresponding carboxylic acids is described. Activation of carboxylic acid with 1-propanephosphonic acid cyclic anhydride (T3P) and subsequent reduction using NaBH4 yield the alcohol in excellent yields with good purity. Reduction of several alkyl/aryl carboxylic acids and Nα-protectedaminoacids/peptide acids as well as Nβ-protected aminoacids was successfully
描述了一种由相应的羧酸合成醇的简单有效的方法。用1-丙烷膦酸环酐(T3P)活化羧酸,然后使用NaBH 4还原,可得到纯度高,纯度高的醇。的减少几个烷基/芳基羧酸和N α -保护的氨基酸/肽酸以及如N β -保护的氨基酸被成功地执行,以获得良好的收率相应的醇。所有产物均通过1 H NMR和质谱分析充分表征。该过程温和,简单,并且容易分离产物。
HOBt·DCHA-Mediated Synthesis of Sterically Hindered Peptides employing Fmoc-Amino Acid Chlorides in Both Solution-Phase and Solid Phase Methods
作者:Vommina V. Sureshbabu、Naremaddepalli S. Sudarshan、G. Chenna Krishna
DOI:10.1080/00397910802219536
日期:2008.7.24
Abstract The synthesis of peptides employing Fmoc-amino acid chlorides in presence of HOBt·DCHA salt in solution as well as by the solid-phase methods is described. The coupling was found to be complete in 30 min and free from racemization. The synthesis of β-casomorphin by solid-phase protocol employing Fmoc-amino acid chloride/HOBt·DCHA in DMF–CH2Cl2 has also been outlined. The final peptide was
Surcshbabu, Vommina V.; Sudarshan; Chennakrishnareddy, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2009, vol. 48, # 4, p. 574 - 579
Babu, Vommina V. Suresh; Kantharaju; Sudarshan, Naremaddepalli S., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2006, vol. 45, # 8, p. 1880 - 1886
作者:Babu, Vommina V. Suresh、Kantharaju、Sudarshan, Naremaddepalli S.