{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T07:03:08Z","timestamp":1791270188679,"version":"4.1.0"},"reference-count":58,"publisher":"National Academy of Sciences","issue":"1","content-domain":{"domain":["www.pnas.org"],"crossmark-restriction":true},"short-container-title":["Proc. Natl. Acad. Sci. U.S.A."],"published-print":{"date-parts":[[1998,1,6]]},"abstract":"<jats:p>\n                    Current ambient UV-B levels can significantly depress productivity in aquatic habitats, largely because UV-B inhibits several steps of photosynthesis, including the photooxidation of water catalyzed by photosystem II. We show that upon UV-B exposure the cyanobacterium\n                    <jats:italic>Synechococcus<\/jats:italic>\n                    sp. PCC 7942 rapidly changes the expression of a family of three\n                    <jats:italic>psbA<\/jats:italic>\n                    genes encoding photosystem II D1 proteins. In wild-type cells the\n                    <jats:italic>psbAI<\/jats:italic>\n                    gene is expressed constitutively, but strong accumulations of\n                    <jats:italic>psbAII<\/jats:italic>\n                    and\n                    <jats:italic>psbAIII<\/jats:italic>\n                    transcripts are induced within 15 min of moderate UV-B exposure (0.4 W\/m\n                    <jats:sup>2<\/jats:sup>\n                    ). This transcriptional response causes an exchange of two distinct photosystem II D1 proteins. D1:1 is encoded by\n                    <jats:italic>psbAI<\/jats:italic>\n                    , but on UV-B exposure, it is largely replaced by the alternate D1:2 form, encoded by both\n                    <jats:italic>psbAII<\/jats:italic>\n                    and\n                    <jats:italic>psbAIII<\/jats:italic>\n                    . The total content of D1 and other photosystem II reaction center protein, D2, remained unchanged throughout the UV exposure, as did the content and composition of the phycobilisome. Wild-type cells suffered only slight transient inhibition of photosystem II function under UV-B exposure. In marked contrast, under the same UV-B treatment, a mutant strain expressing only\n                    <jats:italic>psbAI<\/jats:italic>\n                    suffered severe (40%) and sustained inhibition of photosystem II function. Another mutant strain with constitutive expression of\n                    <jats:italic>psbAII<\/jats:italic>\n                    and\n                    <jats:italic>psbAIII<\/jats:italic>\n                    was almost completely resistant to the UV-B treatment, showing no inhibition of photosystem II function and only a slight drop in electron transport. In\n                    <jats:italic>Synechococcus<\/jats:italic>\n                    the rapid exchange of alternate D1 forms, therefore, accounts for much of the cellular resistance to UV-B inhibition of photosystem II activity and photosynthetic electron transport. This molecular plasticity may be an important element in community-level responses to UV-B, where susceptibility to UV-B inhibition of photosynthesis changes diurnally.\n                  <\/jats:p>","DOI":"10.1073\/pnas.95.1.364","type":"journal-article","created":{"date-parts":[[2002,7,26]],"date-time":"2002-07-26T10:40:11Z","timestamp":1027680011000},"page":"364-369","update-policy":"https:\/\/doi.org\/10.1073\/pnas.cm10313","source":"Crossref","is-referenced-by-count":163,"title":["The cyanobacterium\n                    <i>Synechococcus<\/i>\n                    resists UV-B by exchanging photosystem II reaction-center\u2009D1\u2009proteins"],"prefix":"10.1073","volume":"95","author":[{"given":"Douglas","family":"Campbell","sequence":"first","affiliation":[{"name":"Department of Plant Physiology, University of Ume\u00e5, S-901 87 Ume\u00e5, Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mats-Jerry","family":"Eriksson","sequence":"additional","affiliation":[{"name":"Department of Plant Physiology, University of Ume\u00e5, S-901 87 Ume\u00e5, Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gunnar","family":"\u00d6quist","sequence":"additional","affiliation":[{"name":"Department of Plant Physiology, University of Ume\u00e5, S-901 87 Ume\u00e5, Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Petter","family":"Gustafsson","sequence":"additional","affiliation":[{"name":"Department of Plant Physiology, University of Ume\u00e5, S-901 87 Ume\u00e5, Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Adrian K.","family":"Clarke","sequence":"additional","affiliation":[{"name":"Department of Plant Physiology, University of Ume\u00e5, S-901 87 Ume\u00e5, Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"341","published-online":{"date-parts":[[1998,1,6]]},"reference":[{"key":"e_1_3_3_1_2","doi-asserted-by":"publisher","DOI":"10.1016\/0005-2728(93)90134-2"},{"key":"e_1_3_3_2_2","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.86.17.6617"},{"key":"e_1_3_3_3_2","first-page":"142","volume-title":"Photosynthetic Responses to the Environment","author":"Jansen M A K","year":"1993","unstructured":"M A K Jansen, V Gaba, B Greenberg, A K Mattoo, M Edelman Photosynthetic Responses to the Environment, eds H Y Yamamoto, C M Smith (Am. 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