ID   GLNB_NEOYE              Reviewed;         112 AA.
AC   Q1XDN3;
DT   06-FEB-2007, integrated into UniProtKB/Swiss-Prot.
DT   02-MAY-2006, sequence version 1.
DT   25-MAY-2022, entry version 55.
DE   RecName: Full=Nitrogen regulatory protein P-II;
GN   Name=glnB;
OS   Neopyropia yezoensis (Susabi-nori) (Pyropia yezoensis).
OG   Plastid; Chloroplast.
OC   Eukaryota; Rhodophyta; Bangiophyceae; Bangiales; Bangiaceae; Neopyropia.
OX   NCBI_TaxID=2788;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=U-51;
RA   Kunimoto M., Morishima K., Yoshikawa M., Fukuda S., Kobayashi T.,
RA   Kobayashi M., Okazaki T., Ohara I., Nakayama I.;
RT   "Whole genome sequence of Porphyra yezoensis chloroplast.";
RL   Submitted (NOV-2003) to the EMBL/GenBank/DDBJ databases.
CC   -!- FUNCTION: P-II indirectly controls the transcription of the glutamine
CC       synthetase gene (glnA). P-II prevents NR-II-catalyzed conversion of NR-
CC       I to NR-I-phosphate, the transcriptional activator of glnA. When P-II
CC       is uridylylated to P-II-UMP, these events are reversed. When the ratio
CC       of Gln to 2-ketoglutarate decreases, P-II is uridylylated to P-II-UMP,
CC       which causes the deadenylation of glutamine synthetase, so activating
CC       the enzyme (By similarity). {ECO:0000250}.
CC   -!- SUBUNIT: Homotrimer. {ECO:0000250}.
CC   -!- SUBCELLULAR LOCATION: Plastid, chloroplast.
CC   -!- SIMILARITY: Belongs to the P(II) protein family. {ECO:0000255|PROSITE-
CC       ProRule:PRU00675}.
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DR   EMBL; AP006715; BAE92378.1; -; Genomic_DNA.
DR   RefSeq; YP_536935.1; NC_007932.1.
DR   AlphaFoldDB; Q1XDN3; -.
DR   SMR; Q1XDN3; -.
DR   GeneID; 3978886; -.
DR   GO; GO:0009507; C:chloroplast; IEA:UniProtKB-SubCell.
DR   GO; GO:0030234; F:enzyme regulator activity; IEA:InterPro.
DR   GO; GO:0000166; F:nucleotide binding; IEA:UniProtKB-KW.
DR   GO; GO:0006808; P:regulation of nitrogen utilization; IEA:InterPro.
DR   Gene3D; 3.30.70.120; -; 1.
DR   InterPro; IPR002187; N-reg_PII.
DR   InterPro; IPR011322; N-reg_PII-like_a/b.
DR   InterPro; IPR015867; N-reg_PII/ATP_PRibTrfase_C.
DR   InterPro; IPR017918; N-reg_PII_CS.
DR   InterPro; IPR002332; N-reg_PII_urydylation_site.
DR   PANTHER; PTHR30115; PTHR30115; 1.
DR   Pfam; PF00543; P-II; 1.
DR   PRINTS; PR00340; PIIGLNB.
DR   SMART; SM00938; P-II; 1.
DR   SUPFAM; SSF54913; SSF54913; 1.
DR   PROSITE; PS00638; PII_GLNB_CTER; 1.
DR   PROSITE; PS51343; PII_GLNB_DOM; 1.
DR   PROSITE; PS00496; PII_GLNB_UMP; 1.
PE   3: Inferred from homology;
KW   Chloroplast; Nucleotide-binding; Phosphoprotein; Plastid; Transcription;
KW   Transcription regulation.
FT   CHAIN           1..112
FT                   /note="Nitrogen regulatory protein P-II"
FT                   /id="PRO_0000277288"
FT   MOD_RES         51
FT                   /note="O-UMP-tyrosine"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00675"
SQ   SEQUENCE   112 AA;  12581 MW;  1BD949298E75CA89 CRC64;
     MKKIEAIIRP FKLNEVKLAL VKEGIGGMTV IKVSGFGRQK GQTERYKGSE YSIDIIDKIK
     IEIIISDDKV EKIVETIIKA SKTGEIGDGK IFISSIERVI RIRTNDLNFE AL