ISSN:
1617-4623
Keywords:
Key words PsbY
;
Photosystem II
;
Gene duplication
;
Polyprotein
;
Topogenesis
;
L-Arginine metabolizing enzyme
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract We describe two related manganese-binding polypeptides with L-arginine metabolizing enzyme activity that can be detected as distinct components (designated PsbY-A1 and PsbY-A2, previously called L-AME) in membranes containing Photosystem II (PS II) from spinach. The polypeptides are bitopic and appear to exist in a heterodimeric form, but only in the chlorophyll a/b lineage of plants. Both proteins are encoded in the nucleus. In spinach and in Arabidopsis thaliana they are both derived from a single-copy gene (psbY) that is translated into a precursor polyprotein of approximately 20 kDa. The processing of the polyprotein is complex and includes at least four cleavage steps. Both polypeptides are exposed N-terminally to the lumenal and C-terminally to the stromal face of the thylakoid membrane.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s004380050870
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