By H.R. Petty
This textual content makes an attempt to introduce the molecular biology of mobile membranes to scholars and pros of various backgrounds. even if a number of membrane biology books can be found, they don't combine fresh wisdom won utilizing sleek molecular instruments with extra conventional membrane issues. Molecular thoughts, comparable to cDNA cloning and x-ray diffraction, have supplied clean insights into mobile membrane constitution and serve as. the good pleasure this day, which i try to show during this e-book, is that molecular info are commencing to merge with physiological responses. In different phrases, we're commencing to comprehend accurately how membranes paintings. This textbook is acceptable for upper-level undergraduate or starting graduate scholars. Readers must have earlier or concurrent coursework in biochemistry; previous experiences in ordinary body structure will be worthwhile. i've got chanced on that the presentation of subject matters during this ebook is acceptable for college students of biology, biochemistry, biophysics and body structure, chemistry, and drugs. This booklet may be invaluable in classes concentrating on membranes and as a supplementary textual content in biochemistry classes. execs also will locate this to be an invaluable source e-book for his or her own libraries.
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Extra info for Molecular Biology of Membranes: Structure and Function
For example, gap junctions have six identical subunits. Each subunit spans a membrane four times yielding 24 transmembrane domains per channel. 6 nm) diameter of each channel. Molecules up to 1000 Da can pass through these pores. Smaller channels have fewer transmembrane domains. Enzymatic pumps that transport electrons or protons across a bilayer typically have 10 to 12 transmembrane segments. However, enzymes that act on a substrate at only one membrane face may possess one or zero transmembrane domains.
In addition to primary sequences, the diversity of membrane proteins is also expressed by their covalent chemical modifications. Included among the frequent covalent modifications are: glycosylation, phosphorylation, methylation, acetylation, proteolytic processing, and fatty acyl linkage. 4). 1. We shall return to phosphorylation of membrane proteins in our discussions of energy transduction and transmembrane signaling. 2). Fatty acyl groups have been found in association with many membrane proteins; this includes both glycophospholipid-linked and integral membrane proteins.
9 c c c c ? 11 11 PNAS 74:3725 IBC 255:11927 IBC 254:9324 IBC 255:6173 EMBO I. 3:2831 IBC 260:9513 IBC 261:9206 IBC 261:17183 IBC 259:6571 ? 3. (Continued) Me r Cytochrome b-559 of PSII Subunit 1 Subunit 2 HB protein of PSII 02 protein of PSII 44 k protein of PSI! 51 k protein of PSI! Ribulose 1,5-bisphosphate carboxylase small subunit Penicillinase (membrane-bound) UDP-glucuronosyltransferase [3-1,4-galactosyltransferase Dolicholphosphate man nose synthase a-Glutamyltranspeptidase Heavy chain Light chain Adenylyl cyclase Neuraminidase (influenza virus) Cytochrome b-561 Cytochrome b-563 Receptor/recognition Hemagglutinin (influenza virus) Rhodopsin (bovine) LDL receptor Insulin receptor Insulinlike growth factor Platelet-derived growth factor type 2 receptor Basic fibroblast growth factor receptor Erythropoietin Prolactin receptor Endothelin receptor HLA antigen Class I Class I!