Os06g0194900 - Revision history

Rice2012: /* Structured Information */

2015-06-12T08:08:03Z

‎Structured Information

Yangmei li: /* Evolution */

2014-06-01T07:56:59Z

‎Evolution

Yangmei li at 07:53, 1 June 2014

2014-06-01T07:53:38Z

Yangmei li: /* Evolution */

2014-06-01T03:19:53Z

‎Evolution

Yangmei li: /* Evolution */

2014-06-01T03:19:23Z

‎Evolution

Yangmei li: /* Evolution */

2014-06-01T03:07:21Z

‎Evolution

Yangmei li: /* Evolution */

2014-06-01T02:48:35Z

‎Evolution

Yangmei li: /* References */

2014-06-01T02:46:37Z

‎References

Yangmei li: /* Comparison between SUS1 & SUS2 */

2014-06-01T02:28:56Z

‎Comparison between SUS1 & SUS2

Yangmei li: /* Comparison between SUS1 & SUS2 */

2014-06-01T02:28:07Z

‎Comparison between SUS1 & SUS2

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 ==Structured Information==
 [[Category:Genes]]
 [[Category:Japonica mRNA]]

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 ===Evolution===
 the evolution of multiple SS genes is not for the need of diversified catalytic functions but to meet the differential temporal and spatial requirements of the catalytic function according to the scheme of plant development and in response to environmental changes.this trend may be especially enhanced in the rice where the plant must adapt to the aerobic( leaf,stem,and grain) and anaerobic (root) conditions simultaneously and accumulate starch in a short period of the life span.<ref name="ref1" />
-Sequence similarities in SUS proteins from rice and maize indicate that ''RSus2'' is closely related to maize Sus as is ''RSUSl'' to ''Sh1''.The amino acid sequences deduced from ''RSUS2'' and ''RSUS3'' share an 89.6% identity.The set wo genes maybe evolved from the same ancestor after the divergence of ''RSUSl''.the evolutionary sequences of the three genes as following:
+Sequence similarities in SUS proteins from rice and maize indicate that ''RSus2'' is closely related to maize Sus as is ''RSUSl'' to ''Sh1''.The amino acid sequences deduced from ''RSUS2'' and ''RSUS3'' share an 89.6% identity.The set two genes maybe evolved from the same ancestor after the divergence of ''RSUSl''.the evolutionary sequences of the three genes as following:
 [[File:Three gene phylogenetic tree.png]]

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 there are other mechanisms involved in regulating RSus1 expression. the RSuS1 proteins are extremely stable in sucrose-starved cells. the gene products of RSus1 and RSus2 formed homo- and hetero-tetrameric RSuS isoforms in etiolated rice seedlings. RSuS1 might be stabilized through the formation of heterotetramers with RSuS2 since the RSus2 gene was expressed under sucrose starvation conditions, and the RSuS2 protein level was even higher in sucrose-starved cells than in sucrose-fed cells. Regulation of RSus2 was different from that of RSus1. First, the stability of RSus2 mRNA was higher in sucrose-starved cells, suggesting that post-transcriptional regulation of RSus2 occurred. Second, although the transcriptional activity of RSus2 in sucrose-fed and sucrose-starved cells was similar, the transcription and/or the stability of RSus2 mRNA, was negatively affected by CHX. newly synthesized proteins induced by sucrose or by sucrose starvation were involved in the regulation of RSus2 expression at transcriptional and/or post-transcriptional levels. Furthermore, the changes in mRNA level and those in protein level did not show marked differences, except that the level of RSuS2 protein was higher under prolonged sucrose starvation conditions. However, it may attribute to the higher stability of the RSus2 mRNA in sucrose-starved cells.<ref name="ref5" />
-===Knowledge Extention===
+==Knowledge Extention==
 * sucrose synthase (SS) genes in Populus expression patterns were constitutive and partially overlapping but diverse.
 * In maize, the genes encoding for SuS, ''Sus1'' and ''Sh1'',show contrasting carbohydrate responses; that is,''Sus1'' is upregulated while ''Sh1'' is downregulated in the presence of abundant carbohydrate supplies.<ref name="ref5" />

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 Sequence similarities in SUS proteins from rice and maize indicate that ''RSus2'' is closely related to maize Sus as is ''RSUSl'' to ''Sh1''.The amino acid sequences deduced from ''RSUS2'' and ''RSUS3'' share an 89.6% identity.The set wo genes maybe evolved from the same ancestor after the divergence of ''RSUSl''.the evolutionary sequences of the three genes as following:
 [[File:Three gene phylogenetic tree.png]]
 the ancestral gene for genes 1 and 3 is given number 3 because it is considered to have 15 introns like gene 2, in other words, the 14 intron structure of gene1 is derived from a 15 intron structure by gene contraction. the isozymes so far isolated from the rice show little differences in their catalytic properties. the SS genes evolved in the plant kingdom at a very early stage. probably immediately following the evolution of sucrose-oriented photosynthetic carbon assimilation system.

@@ Line 29: / Line 29: @@
 ===Evolution===
 the evolution of multiple SS genes is not for the need of diversified catalytic functions but to meet the differential temporal and spatial requirements of the catalytic function according to the scheme of plant development and in response to environmental changes.this trend may be especially enhanced in the rice where the plant must adapt to the aerobic( leaf,stem,and grain) and anaerobic (root) conditions simultaneously and accumulate starch in a short period of the life span.<ref name="ref1" />
-Sequence similarities in SUS proteins from rice and maize indicate that ''RSus2'' is closely related to maize Sus as is ''RSUSl'' to ''Sh1''.The amino acid sequences deduced from ''RSUS2'' and ''RSUS3'' share an 89.6% identity.The set wo genes maybe evolved from the same ancestor after the divergence of ''RSUSl''.
+Sequence similarities in SUS proteins from rice and maize indicate that ''RSus2'' is closely related to maize Sus as is ''RSUSl'' to ''Sh1''.The amino acid sequences deduced from ''RSUS2'' and ''RSUS3'' share an 89.6% identity.The set wo genes maybe evolved from the same ancestor after the divergence of ''RSUSl''.the evolutionary sequences of the three genes as following:
 [[File:Three gene phylogenetic tree.png]]
 ===Comparison between ''SUS1'' & ''SUS2''===

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 ==References==
 <references>
-<ref name="ref1"> Ju-Wei HUANG;Jen-Tao CHEN;Wei-Ping YU;Lie-Fen SHYUR;Ai-Yu WANG;Hsien-Yi SUNG;Ping-Du LEE;Jong-Ching Su
+<ref name="ref1"> Ju-Wei HUANG;Jen-Tao CHEN;Wei-Ping YU;Lie-Fen SHYUR;Ai-Yu WANG;Hsien-Yi SUNG;Ping-Du LEE;Jong-Ching Su,
-   Complete Structures of Three Rice Sucrose Synthase Isogenes and Differential Regulation of Their Expressions
+   Complete Structures of Three Rice Sucrose Synthase Isogenes and Differential Regulation of Their Expressions Bioscience, Biotechnology, and Biochemistry, 1996, 60(2): 233-239.</ref>
 <ref name="ref2"> Tatsuro Hirose;Graham N. Scofield;Tomio Terao An expression analysis profile for the entire sucrose synthase gene family in rice
    Plant Science, 2008, 174(5): 534-543.</ref>