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Special Issue "Marine Natural Products Discovery: In Honor of Late Prof. Tatsuo Higa"

A special issue of Marine Drugs (ISSN 1660-3397).

Deadline for manuscript submissions: 16 August 2019

Special Issue Editor

Guest Editor
Prof. Dr. Junichi Tanaka

Department of Chemistry, Biology and Marine Science, University of the Ryukyus, Nishihara, Okinawa 903-0213, Japan
Website | E-Mail
Phone: +81-98-895-8560
Fax: +81 98 895 8565
Interests: marine natural products; biodiversity

Special Issue Information

Dear Colleauges,

The late Prof. Tatsuo Higa devoted himself to the development of marine natural product chemistry for years (1970–2005). To commemorate his enthusiastic activities, we would like to open a space for his memory. As he focused mainly on the isolation of new bioactive molecules from marine organisms, we request researchers to contribute papers on isolation, biological activities and pharmacological mechanisms, structure–activity relationship, ecological aspects, biodiversity, synthesis, biosynthesis, and other relevant issues on marine natural products.

Prof. Dr. Junichi Tanaka
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Marine Drugs is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2000 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • marine natural product
  • drug discovery
  • bioactivity
  • structure-activity relationship
  • biosynthesis

Published Papers (9 papers)

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Research

Open AccessArticle
Soritesidine, a Novel Proteinous Toxin from the Okinawan Marine Sponge Spongosorites sp.
Mar. Drugs 2019, 17(4), 216; https://doi.org/10.3390/md17040216
Received: 13 March 2019 / Revised: 1 April 2019 / Accepted: 3 April 2019 / Published: 8 April 2019
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Abstract
A novel protein, soritesidine (SOR) with potent toxicity was isolated from the marine sponge Spongosorites sp. SOR exhibited wide range of toxicities over various organisms and cells including brine shrimp (Artemia salina) larvae, sea hare (Aplysia kurodai) eggs, mice, [...] Read more.
A novel protein, soritesidine (SOR) with potent toxicity was isolated from the marine sponge Spongosorites sp. SOR exhibited wide range of toxicities over various organisms and cells including brine shrimp (Artemia salina) larvae, sea hare (Aplysia kurodai) eggs, mice, and cultured mammalian cells. Toxicities of SOR were extraordinary potent. It killed mice at 5 ng/mouse after intracerebroventricular (i.c.v.) injection, and brine shrimp and at 0.34 µg/mL. Cytotoxicity for cultured mammalian cancer cell lines against HeLa and L1210 cells were determined to be 0.062 and 12.11 ng/mL, respectively. The SOR-containing fraction cleaved plasmid DNA in a metal ion dependent manner showing genotoxicity of SOR. Purified SOR exhibited molecular weight of 108.7 kDa in MALDI-TOF MS data and isoelectric point of approximately 4.5. N-terminal amino acid sequence up to the 25th residue was determined by Edman degradation. Internal amino acid sequences for fifteen peptides isolated from the enzyme digest of SOR were also determined. None of those amino acid sequences showed similarity to existing proteins, suggesting that SOR is a new proteinous toxin. Full article
(This article belongs to the Special Issue Marine Natural Products Discovery: In Honor of Late Prof. Tatsuo Higa)
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Open AccessArticle
Briarenones A‒C, New Briarellin Diterpenoids from the Gorgonian Briareum violaceum
Mar. Drugs 2019, 17(2), 120; https://doi.org/10.3390/md17020120
Received: 9 January 2019 / Revised: 1 February 2019 / Accepted: 12 February 2019 / Published: 17 February 2019
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Abstract
Three new eunicellin-derived diterpenoids of briarellin type, briarenones A‒C (13), were isolated from a Formosan gorgonian Briareum violaceum. The chemical structures of the compounds were elucidated on the basis of extensive spectroscopic analyses, including two-dimensional (2D) NMR. The [...] Read more.
Three new eunicellin-derived diterpenoids of briarellin type, briarenones A‒C (13), were isolated from a Formosan gorgonian Briareum violaceum. The chemical structures of the compounds were elucidated on the basis of extensive spectroscopic analyses, including two-dimensional (2D) NMR. The absolute configuration of 1 was further confirmed by a single crystal X-ray diffraction analysis. The in vitro cytotoxic and anti-inflammatory potentialities of the isolated metabolites were tested against the growth of a limited panel of cancer cell lines and against the production of superoxide anions and elastase release in N-formyl-methionyl-leucyl-phenyl-alanine and cytochalasin B (fMLF/CB)-stimulated human neutrophils, respectively. Full article
(This article belongs to the Special Issue Marine Natural Products Discovery: In Honor of Late Prof. Tatsuo Higa)
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Open AccessArticle
Cacolides: Sesterterpene Butenolides from a Southern Australian Marine Sponge, Cacospongia sp.
Mar. Drugs 2018, 16(11), 456; https://doi.org/10.3390/md16110456
Received: 26 October 2018 / Revised: 15 November 2018 / Accepted: 15 November 2018 / Published: 20 November 2018
Cited by 1 | PDF Full-text (4080 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
Chemical analysis of a marine sponge, Cacospongia sp. (CMB-03404), obtained during deep sea commercial fishing activities off the southern coast of Australia, yielded an unprecedented family of sesterterpene α-methyl-γ-hydroxybutenolides, cacolides A–L (112), together with biosynthetically related norsesterterpene carboxylic acids, [...] Read more.
Chemical analysis of a marine sponge, Cacospongia sp. (CMB-03404), obtained during deep sea commercial fishing activities off the southern coast of Australia, yielded an unprecedented family of sesterterpene α-methyl-γ-hydroxybutenolides, cacolides A–L (112), together with biosynthetically related norsesterterpene carboxylic acids, cacolic acids A–C (1315). Structures were assigned on the basis of detailed spectroscopic analysis with comparisons to known natural products and biosynthetic considerations. In addition to revealing new chemical diversity, this study provided a valuable platform for comparing and contrasting the capabilities of the traditional dereplication technologies of HPLC-DAD, HPLC-MS and NMR, with those of the emerging HPLC-MS/MS approach known as global natural products social molecular networking (GNPS), as applied to marine sponge sesterterpene tetronic acids. Full article
(This article belongs to the Special Issue Marine Natural Products Discovery: In Honor of Late Prof. Tatsuo Higa)
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Open AccessArticle
Benderamide A, a Cyclic Depsipeptide from a Singapore Collection of Marine Cyanobacterium cf. Lyngbya sp.
Mar. Drugs 2018, 16(11), 409; https://doi.org/10.3390/md16110409
Received: 12 September 2018 / Revised: 18 October 2018 / Accepted: 22 October 2018 / Published: 26 October 2018
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Abstract
Benderamide A (1), a (S)-2,2-dimethyl-3-hydroxy-7-octynoic acid (S-Dhoya)-containing cyclic depsipeptide that belongs to the kulolide superfamily, was isolated from a Singapore collection of cf. Lyngbya sp. marine cyanobacterium using a bioassay-guided approach. While the planar structure of 1 [...] Read more.
Benderamide A (1), a (S)-2,2-dimethyl-3-hydroxy-7-octynoic acid (S-Dhoya)-containing cyclic depsipeptide that belongs to the kulolide superfamily, was isolated from a Singapore collection of cf. Lyngbya sp. marine cyanobacterium using a bioassay-guided approach. While the planar structure of 1 was elucidated using a combination of 1D and 2D NMR experiments and MS analysis, the absolute configuration was subsequently achieved using the results obtained from Marfey’s analysis, comparative analysis of nuclear overhauser effect spectroscopy (NOESY) with the known compound 3, and one dimensional-nuclear overhauser effect (1D-NOE). Although 1 did not display antiproliferative activity against MCF7 breast cancer cells, the presence of an Ala instead of Gly suggests a possible mechanistic pathway to explain the consequential decrease in cytotoxicity compared to the closely related 2. In addition, results obtained from an LC–MS/MS-based molecular networking algorithm revealed two other closely related compounds encouraging further identification and isolation from the same marine cyanobacterium extract. Full article
(This article belongs to the Special Issue Marine Natural Products Discovery: In Honor of Late Prof. Tatsuo Higa)
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Open AccessArticle
Marine Peroxy Sesquiterpenoids Induce Apoptosis by Modulation of Nrf2-ARE Signaling in HCT116 Colon Cancer Cells
Mar. Drugs 2018, 16(10), 347; https://doi.org/10.3390/md16100347
Received: 6 September 2018 / Revised: 14 September 2018 / Accepted: 19 September 2018 / Published: 23 September 2018
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Abstract
Our current study demonstrated that the marine peroxy sesquiterpenoids isolated from the Okinawan soft coral Sinularia sp. have an antitumor activity in human colon cancer cell (HCT) 116 colon cancer cells with their induction of apoptosis due to H2O2 production [...] Read more.
Our current study demonstrated that the marine peroxy sesquiterpenoids isolated from the Okinawan soft coral Sinularia sp. have an antitumor activity in human colon cancer cell (HCT) 116 colon cancer cells with their induction of apoptosis due to H2O2 production derived from the compounds. This study clarified that peroxy sesquiterpenoids (1 and 2) inhibited anti-apoptosis proteins, such as B-cell lymphoma-extra large (Bcl-xL) and phosphoAkt (pAkt). In addition, the heme oxygenase-1 (HO-1), nuclear factor-erythroid-2-related factor (Nrf2), and phosphoNrf2 (pNrf2) proteins related to the cell survival regulation signal of Nrf2-ARE (antioxidant response element) were also suppressed in the presence of these compounds. While the cells treated with the compounds and trolox as an antioxidant expressed the inhibited proteins, such as HO-1, Nrf2, and Bcl-xL, it was suggested that the H2O2 involving free radical reactions derived from the molecule would be a trigger of apoptosis with the modulation of Nrf2-ARE signaling in the cells. Full article
(This article belongs to the Special Issue Marine Natural Products Discovery: In Honor of Late Prof. Tatsuo Higa)
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Open AccessArticle
Cloning of the Bisucaberin B Biosynthetic Gene Cluster from the Marine Bacterium Tenacibaculum mesophilum, and Heterologous Production of Bisucaberin B
Mar. Drugs 2018, 16(9), 342; https://doi.org/10.3390/md16090342
Received: 24 August 2018 / Revised: 12 September 2018 / Accepted: 15 September 2018 / Published: 19 September 2018
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Abstract
The biosynthetic gene cluster for bisucaberin B (1, bsb gene cluster), an N-hydroxy-N-succinyl diamine (HSD)-based siderophore, was cloned from the marine bacterium Tenacibaculum mesophilum, originated from a marine sponge. The bsb gene cluster consists of six open [...] Read more.
The biosynthetic gene cluster for bisucaberin B (1, bsb gene cluster), an N-hydroxy-N-succinyl diamine (HSD)-based siderophore, was cloned from the marine bacterium Tenacibaculum mesophilum, originated from a marine sponge. The bsb gene cluster consists of six open reading frames (ORFs), in contrast to the four ORFs typically seen in biosynthetic gene clusters of the related molecules. Heterologous expression of the key enzyme, BsbD2, which is responsible for the final biosynthetic step of 1 resulted in production of bisucaberin B (1), but not bisucaberin (2) a macrocyclic counterpart of 1. To date, numbers of related enzymes producing macrocyclic analogues have been reported, but this work represents the first example of the HSD-based siderophore biosynthetic enzyme which exclusively produces a linear molecule rather than macrocyclic counterparts. Full article
(This article belongs to the Special Issue Marine Natural Products Discovery: In Honor of Late Prof. Tatsuo Higa)
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Open AccessArticle
Cembranoid-Related Metabolites and Biological Activities from the Soft Coral Sinularia flexibilis
Mar. Drugs 2018, 16(8), 278; https://doi.org/10.3390/md16080278
Received: 6 July 2018 / Revised: 1 August 2018 / Accepted: 7 August 2018 / Published: 9 August 2018
Cited by 4 | PDF Full-text (2605 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
Five new cembranoid-related diterpenoids, namely, flexibilisins D and E (1 and 2), secoflexibilisolides A and B (3 and 4), and flexibilisolide H (5), along with nine known compounds (614), were isolated from the [...] Read more.
Five new cembranoid-related diterpenoids, namely, flexibilisins D and E (1 and 2), secoflexibilisolides A and B (3 and 4), and flexibilisolide H (5), along with nine known compounds (614), were isolated from the soft coral Sinularia flexibilis. Their structures were established by extensive spectral analysis. Compound 3 possesses an unusual skeleton that could be biogenetically derived from cembranoids. The cytotoxicity and anti-inflammatory activities of the isolates were investigated, and the results showed that dehydrosinulariolide (7) and 11-epi-sinulariolide acetate (8) exhibited cytotoxicity toward a limited panel of cancer cell lines and 14-deoxycrassin (9) displayed anti-inflammatory activity by inhibition of superoxide anion generation and elastase release in N-formyl-methionyl-leucyl-phenylalanine/cytochalasin B (fMLF/CB)-induced human neutrophils. Full article
(This article belongs to the Special Issue Marine Natural Products Discovery: In Honor of Late Prof. Tatsuo Higa)
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Open AccessArticle
Absorption Study of Mozuku Fucoidan in Japanese Volunteers
Mar. Drugs 2018, 16(8), 254; https://doi.org/10.3390/md16080254
Received: 14 June 2018 / Revised: 27 June 2018 / Accepted: 28 July 2018 / Published: 30 July 2018
Cited by 1 | PDF Full-text (625 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
We performed an oral administration study of fucoidan in 396 Japanese volunteers and investigated significant factors concerning the absorption of fucoidan. Urine samples were collected at 0, 3, 6, and 9 h after ingestion of 3 g of fucoidan. Fucoidan was detected in [...] Read more.
We performed an oral administration study of fucoidan in 396 Japanese volunteers and investigated significant factors concerning the absorption of fucoidan. Urine samples were collected at 0, 3, 6, and 9 h after ingestion of 3 g of fucoidan. Fucoidan was detected in urine after ingestion in 385 out of 396 subjects. The maximum value (mean ± standard deviation (SD)) of urinary fucoidan was 332.3 ± 357.6 μg/gCr in subjects living in Okinawa prefecture, compared with 240.1 ± 302.4 μg/gCr in subjects living outside Okinawa. Compared with the estimated urinary excretion of fucoidan by place of residence, those of subjects living in Okinawa prefecture were significantly higher than those living outside Okinawa prefecture (p < 0.01). In addition, subjects living in Okinawa prefecture consumed significantly greater amounts of mozuku compared with those living outside Okinawa prefecture (p < 0.01). Multiple regression analysis showed that having Okinawa prefecture as a place of residence was a significant factor (p < 0.01) contributing to the estimated urinary excretion of fucoidan. Because the habit of eating mozuku was significantly higher (p < 0.01) in subjects living in Okinawa prefecture than in those living outside Okinawa prefecture, the habit of eating mozuku was speculated to be a factor in the absorption of fucoidan. Full article
(This article belongs to the Special Issue Marine Natural Products Discovery: In Honor of Late Prof. Tatsuo Higa)
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Open AccessArticle
Isolation and Structure Elucidation of Cembranoids from a Dongsha Atoll Soft Coral Sarcophyton stellatum
Mar. Drugs 2018, 16(6), 210; https://doi.org/10.3390/md16060210
Received: 9 May 2018 / Revised: 31 May 2018 / Accepted: 5 June 2018 / Published: 14 June 2018
Cited by 1 | PDF Full-text (5268 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
Six new polyoxygenated cembrane-based diterpenoids, stellatumolides A–C (13), stellatumonins A and B (4 and 5), and stellatumonone (6), were isolated together with ten known related compounds (716) from the ethyl acetate [...] Read more.
Six new polyoxygenated cembrane-based diterpenoids, stellatumolides A–C (13), stellatumonins A and B (4 and 5), and stellatumonone (6), were isolated together with ten known related compounds (716) from the ethyl acetate (EtOAc) extract of soft coral Sarcophyton stellatum. The structures of the new compounds were established by extensive spectroscopic analyses, including 1D and 2D nuclear magnetic resonance (NMR) spectroscopy and data comparison with related structures. Compounds 8 and 14 were isolated from a natural source for the first time. The isolated metabolites were shown to be not cytotoxic against a limited panel of cancer cells. Compound 9 showed anti-inflammatory activity by reducing the expression of proinflammatory cyclooxygenase-2 (COX-2) and inducible nitric oxide synthase (iNOS) proteins in lipopolysaccharide (LPS)-stimulated mouse leukaemic monocyte macrophage (RAW 264.7) cells. Full article
(This article belongs to the Special Issue Marine Natural Products Discovery: In Honor of Late Prof. Tatsuo Higa)
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