heptad


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hep·tad

 (hĕp′tăd′)
n.
A group or series of seven.
[Greek heptas, heptad-, the number seven, from hepta, seven; see septm̥ in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

heptad

(ˈhɛptæd)
n
1. (Mathematics) a group or series of seven
2. (Mathematics) the number or sum of seven
3. (Chemistry) an atom or element with a valency of seven
[C17: from Greek heptas seven]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

hep•tad

(ˈhɛp tæd)

n.
1. the number seven.
2. a group of seven.
[1650–60; < Greek heptad-, s. of heptás. See hepta-, -ad1]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.heptad - the cardinal number that is the sum of six and oneheptad - the cardinal number that is the sum of six and one
7, septenary, septet, seven, sevener, VII
digit, figure - one of the elements that collectively form a system of numeration; "0 and 1 are digits"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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References in periodicals archive ?
The bZIP domain located near the C-terminus of Nrf1 is characterized by a 30-amino acid region enriched in arginine and lysine residues and a 40amino acid helical region containing heptad repeats of leucine and hydrophobic residues.
Transcriptional regulation of the 26S proteasome by Nrf1
Deweid et al., "An apoptosis-inducing peptidic heptad that efficiently clusters death receptor 5," Angewandte Chemie International Edition, vol.
Luminescent Iridium Complex-Peptide Hybrids (IPHs) for Therapeutics of Cancer: Design and Synthesis of IPHs for Detection of Cancer Cells and Induction of Their Necrosis-Type Cell Death
Heptad repeats of hydrophobic amino acids in LBD are involved in nuclear receptor dimerization and may regulate target nuclear localization [6].
The Orphan Nuclear Receptor 4A1: A Potential New Therapeutic Target for Metabolic Diseases
Analysis of heptad repeat regions (HR; HRa, HRb, HRc) revealed a total of four substitutions in HRa (143-185 aa) with change A176aS; HRb (268-299 aa) with change N272aY and HRc (471-500 aa) with two changes E482aT; K494aR.Analysis of chicken/NDV/Pak/AW-14 strain's transmembrane domain showed four substitutions at positions V506aA; V513aF; A516aV and V520aG.
COMPLETE GENOMIC ANALYSIS OF NEWCASTLE DISEASE VIRUS OF A RECENT PANZOOTIC ISOLATED FROM VACCINATED POULTRY FLOCK IN 2014 IN PAKISTAN
In contrast, the downstream leucine zipper region is made up of heptad leucine repeats, a repeated pattern of several amino acids, or other hydrophobic amino acids, such as Ile, Phe, and Met [4].
Genome-Wide Identification of bZIP Family Genes Involved in Drought and Heat Stresses in Strawberry (Fragaria vesca)
The NHR2 domain contains a hydrophobic heptad repeat (HHR) critical for tetramerization of MTG family members, and it seems that this interaction can occur in the context of homodimeric MTG (e.g., MTG16:MTG16) or heterodimeric MTG (e.g., MTG16:MTG8) complexes [12].
Emerging Roles of MTG16 in Cell-Fate Control of Hematopoietic Stem Cells and Cancer
Differentiating features also occur in repeat toxin A gene (rtxA), chromosomal location of CTX[phi], the number of heptad repeats in ToxR binding region, and the occurrence of vibrio seventh pandemic islands I and II (1,2).
Vibrio cholerae O1 imported from Iraq to Kuwait, 2015
The peptide, called heptad repeat 2 (HR2P), has "good potential" for development into a future drug against Mers, it says.
Lab-dish advance against Mers virus

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