Rat retina has an active and stable ubiquitin-protein conjugating system.

Abstract:

:We describe here the presence of ubiquitin and its conjugation system in the rat retina. Retinal homogenates and supernatants conjugate [125I]human ubiquitin with either endogenous or exogenous proteins. The conjugating activity is relatively stable over time, requires ATP, and has a pH optimum of approximately 8. The most prominent [125I]ubiquitin conjugates formed are larger than 130 kDa. Several other minor conjugates are also formed between the molecular weights 17 and 75 kDa. The endogenous levels of free and conjugated forms of ubiquitin have been determined in the rat retina. More than 50% of retinal ubiquitin is covalently bound to target proteins. In addition, activities responsible for the ATP-dependent degradation and disassembly of both endogenous and exogenous ubiquitin conjugates have been detected in vitro. These results provide evidence that the retina contains active and stable ubiquitin-conjugating enzymes that recognize retinal proteins and have ATP-dependent proteolytic activity.

journal_name

J Neurosci Res

authors

Naash M,Izbicka E,Anderson RE

doi

10.1002/jnr.490300220

subject

Has Abstract

pub_date

1991-10-01 00:00:00

pages

433-41

issue

2

eissn

0360-4012

issn

1097-4547

journal_volume

30

pub_type

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