alpha m-Crystallin: the native form of the protein?

Abstract:

:Evidence is presented that alpha-crystallin isolated at 37 degrees C exists as a species, alpha m, which has a minimum molecular weight of about 320000 and a sedimentation coefficient of about 12 S. The amino acid composition, subunit distribution, near- and far-UV CD spectra and immunochemical properties were identical to those of the previously studied, 19 S protein, alpha c-crystallin (minimum molecular weight, 635000). It was demonstrated that only alpha m-crystallin was present in 37 degrees C lens extracts and that cooling of lenses or extracts resulted in a conversion of alpha m- to alpha c-crystallin. This conversion appears to be a general phenomenon, independent of age or species. It was concluded that alpha c-crystallin is an aggregate, produced by cooling, and that alpha m-crystallin is more likely to represent the in vivo form of the protein.

journal_name

Exp Eye Res

authors

Thomson JA,Augusteyn RC

doi

10.1016/0014-4835(83)90173-2

subject

Has Abstract

pub_date

1983-10-01 00:00:00

pages

367-77

issue

4

eissn

0014-4835

issn

1096-0007

pii

0014-4835(83)90173-2

journal_volume

37

pub_type

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