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Characterization of Evolutionarily ConservedMotifs Involved in Activity and Regulation of theABA-INSENSITIVE （ABI） 4 Transcription Factor

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Molecular Plant 2014年第2期7卷 422-436页

作者： Josefat Gregorio alma fabiola hernández-bernal Elizabeth Cordoba Patricia León Departamento de Biología Molecular de Plantas Instituto de Biotecnología Universidad Nacional Autónoma de México Av. Universidad # 2001 Col. Chamilpa Cuernavaca Morelos C.p. 62210 Mexico

In recent years, the transcription factor ABI4 has emerged as an important node of integration for externaland internal signals such as nutrient status and hormone signaling that modulates critical transitions during the growthand development of plants. For this reason, understanding the mechanism of action and regulation of this protein rep-resents an important step towards the elucidation of crosstalk mechanisms in plants. However, this understanding hasbeen hindered due to the negligible levels of this protein as a result of multiple posttranscriptional regulations. To betterunderstand the function and regulation of the ABI4 protein in this work, we performed a functional analysis of severalevolutionarily conserved motifs. Based on these conserved motifs, we identified ortholog genes of ABI4 in differentplant species. The functionality of the putative ortholog from Theobroma cacao was demonstrated in transient expres-sion assays and in complementation studies in plants. The function of the highly conserved motifs was analyzed aftertheir deletion or mutagenesis in the Arabidopsis ABI4 sequence using mesophyll protoplasts. This approach permitted usto immunologically detect the ABI4 protein and identify some of the mechanisms involved in its regulation. We identi-fied sequences required for the nuclear localization （AP2-associated motif） as well as those for transcriptional activationfunction （LRP motif）. Moreover, this approach showed that the protein stability of this transcription factor is controlledthrough protein degradation and subcellular localization and involves the AP2-associated and the PEST motifs. We dem-onstrated that the degradation of ABI4 protein through the PEST motif is mediated by the 26S proteasome in responseto changes in the sugar levels.

关键词： ABI4 posttranslational regulation transcription factor sugar signaling abscisic acid-insensitive protea-some nuclear localization signals

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Chemical Treatment to Recover Molybdenum and Vanadium from Spent Heavy Gasoil Hydrodesulfurization Catalyst

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Advances in Chemical Engineering and Science 2012年第3期2卷 408-412页

作者： alma Delia Rojas-Rodríguez Orlando Flores-Fajardo fabiola Selene Alcántar González Néstor Noé López Castillo Modesto Javier Cruz Gómez Chemical Engineering Department of the Faculty of Chemistry Universidad Nacional Autónoma de México (UNAM) Coyoacán México Faculty of Engineering Universidad Anáhuac México Norte México City México

Large quantities of spent hydrodesulfurization (HDS) catalysts are available from petrochemical industry. Disposal of spent catalyst is a problem as it falls under the category of hazardous industrial waste due to its vanadium concentration. Most of these catalysts are usually supported on alumina containing a variable percentage of elements such as nickel or molybdenum. Hence these catalysts contain environmentally critical, and economically valuable metals such as molyb denum, vanadium, and, nickel. In this paper, a spent HDS catalyst was treated with caustic soda solution. Parameters such as temperature, time, and NaOH solution concentration have been studied thoroughly, in order to settle the appropriate conditions for the maximum recovery of molybdenum and vanadium. Under the best leaching conditions (20 %w NaOH, room temperature, 2 h) about 95% recovery of Mo and V was achieved, and the recovery of nickel obtained was of 99% in the form of NiAlO4.

关键词： Spent HDS Catalyst Vanadium Molybdenum Metal Recovery

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